Publications

@article{primo2020dissipative,

title = {Quasinormal-Mode Perturbation Theory for Dissipative and Dispersive Optomechanics},

author = {André G Primo and Natália C Carvalho and Cau{ê} M Kersul and Newton C Frateschi and Gustavo S Wiederhecker and Thiago Mayer P Alegre},

url = {http://arxiv.org/abs/2006.00692 https://link.aps.org/doi/10.1103/PhysRevLett.125.233601},

doi = {10.1103/PhysRevLett.125.233601},

issn = {0031-9007},

year  = {2020},

date = {2020-12-01},

journal = {Physical Review Letters},

volume = {125},

number = {23},

pages = {233601},

abstract = {Despite the several novel features arising from the dissipative optomechanical coupling, such effect remains vastly unexplored due to the lack of a simple formalism that captures non-Hermiticity in optomechanical systems. In this Letter, we show that quasinormal-mode-based perturbation theory is capable of correctly predicting both dispersive and dissipative optomechanical couplings. We validate our model through simulations and also by comparison with experimental results reported in the literature. Finally, we apply this formalism to plasmonic systems, used for molecular optomechanics, where strong dissipative coupling signatures in the amplification of vibrational modes are observed.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Inga2020,

title = {Alumina coating for dispersion management in ultra-high Q microresonators},

author = {Marvyn Inga and Laís Fujii and José Maria C {da Silva Filho} and Jo{ã}o Henrique {Quintino Palhares} and Andre Santarosa Ferlauto and Francisco C Marques and Thiago P {Mayer Alegre} and Gustavo Wiederhecker},

url = {http://aip.scitation.org/doi/10.1063/5.0028839},

doi = {10.1063/5.0028839},

issn = {2378-0967},

year  = {2020},

date = {2020-11-01},

journal = {APL Photonics},

volume = {5},

number = {11},

pages = {116107},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{li2020proposal,

title = {Proposal for optomechanical quantum teleportation},

author = {Jie Li and Andreas Wallucks and Rodrigo Benevides and Niccolo Fiaschi and Bas Hensen and Thiago Mayer P Alegre and Simon Gröblacher},

url = {http://arxiv.org/abs/2005.08860 http://dx.doi.org/10.1103/PhysRevA.102.032402 https://link.aps.org/doi/10.1103/PhysRevA.102.032402},

doi = {10.1103/PhysRevA.102.032402},

issn = {2469-9926},

year  = {2020},

date = {2020-09-01},

journal = {Physical Review A},

volume = {102},

number = {3},

pages = {032402},

abstract = {We present a novel discrete-variable quantum teleportation scheme using pulsed optomechanics. In our proposal, we demonstrate how an unknown optical input state can be transferred onto the joint state of a pair of mechanical oscillators, without physically interacting with one another. We further analyze how experimental imperfections will affect the fidelity of the teleportation and highlight how our scheme can be realized in current state-of-the-art optomechanical systems.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fujii2020,

title = {Dispersion tailoring in wedge microcavities for Kerr comb generation},

author = {L Fujii and M Inga and J H Soares and Y A V Espinel and T P {Mayer Alegre} and G S Wiederhecker},

url = {https://www.osapublishing.org/abstract.cfm?URI=ol-45-12-3232},

doi = {10.1364/ol.393294},

issn = {0146-9592},

year  = {2020},

date = {2020-06-01},

journal = {Optics Letters},

volume = {45},

number = {12},

pages = {3232},

abstract = {The shaping of group velocity dispersion in microresonators is an important component in the generation of wideband optical frequency combs. Small resonators - with tight bending radii - offer the large free-spectral range desirable for wide comb formation. However, the tighter bending usually limit comb formation as it enhances normal group velocity dispersion. We experimentally demonstrate that engineering the sidewall angle of small-radius (100 $mu$m), 3 $mu$m-thick silica wedge microdisks enables dispersion tuning in both normal and anomalous regimes, without significantly affecting the free spectral range. A microdisk with wedge angle of $55^circ$ (anomalous dispersion) is used to demonstrate a 300 nm bandwidth Kerr optical frequency comb.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Melo2020,

title = {Bright and Vivid Diffractive–Plasmonic Reflective Filters for Color Generation},

author = {Emerson G Melo and Ana L A Ribeiro and Rodrigo S Benevides and Antonio A G V Zuben and Marcos V {Puydinger dos Santos} and Alexandre A Silva and Gustavo S Wiederhecker and Thiago P M Alegre},

url = {https://pubs.acs.org/doi/10.1021/acsanm.9b02508},

doi = {10.1021/acsanm.9b02508},

issn = {2574-0970},

year  = {2020},

date = {2020-02-01},

journal = {ACS Applied Nano Materials},

volume = {3},

number = {2},

pages = {1111--1117},

abstract = {The desire to reproduce vivid colors such as those found in birds, fishes, flowers, and insects has driven extensive research into nanostructured surfaces especially because of their high spatial resolution. Using a periodic silicon-patterned structure coated with aluminum, we combine two distinct and yet interconnected effects to produce bright and vivid color surfaces. A genetic algorithm optimization process was used to fine-tune both the diffraction and plasmonic effects to obtain reflective color filters for the red, green, and blue colors. The obtained structures are suitable for displays, image applications, color sensors, and optical filters.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Benevides2020,

title = { Ar/Cl 2 etching of GaAs optomechanical microdisks fabricated with positive electroresist },

author = {Rodrigo Benevides and Micha{ë}l Ménard and Gustavo S Wiederhecker and Thiago P {Mayer Alegre}},

url = {https://www.osapublishing.org/abstract.cfm?URI=ome-10-1-57},

doi = {10.1364/OME.10.000057},

issn = {2159-3930},

year  = {2020},

date = {2020-01-01},

journal = {Optical Materials Express},

volume = {10},

number = {1},

pages = {57},

abstract = {A method to fabricate GaAs microcavities using only a soft mask with an electrolithographic pattern in an inductively coupled plasma etching is presented. A careful characterization of the fabrication process pinpointing the main routes for a smooth device sidewall is discussed. Using the final recipe, optomechanical microdisk resonators are fabricated. The results show a very high optical quality factors of $Q_textopt>2times 10^5$, among the largest already reported for dry-etching devices. The final devices are also shown to present high mechanical quality factors and an optomechanical vacuum coupling constant of $g_0=2pitimes 13.6$ kHz enabling self-sustainable mechanical oscillations for an optical input power above $1$ mW.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wiederhecker:2019ey,

title = {Brillouin optomechanics in nanophotonic structures},

author = {Gustavo S Wiederhecker and Paulo Dainese and Thiago Mayer P Alegre},

url = {http://aip.scitation.org/doi/10.1063/1.5088169},

doi = {10.1063/1.5088169},

year  = {2019},

date = {2019-01-01},

journal = {APL Photonic},

volume = {4},

number = {7},

pages = {071101},

publisher = {AIP Publishing LLC},

abstract = {The interaction between light and mesoscopic mechanical degrees of freedom has been investigated under various perspectives, from spectroscopy in condensed matter, optical tweezer particle trapping, and long-haul optical fiber communication system penalties to gravitational-wave detector noise. In the context of integrated photonics, two topics with dissimilar origins—cavity optomechanics and guided wave Brillouin scattering—are rooted in the manipulation and control of the energy exchange between trapped light and mechanical modes. In this tutorial, we explore the impact of optical and mechanical subwavelength confinement on the interaction among these waves, coined as Brillouin optomechanics. At this spatial scale, optical and mechanical fields are fully vectorial and the common intuition that more intense fields lead to stronger interaction may fail. Here, we provide a thorough discussion on how the two major physical effects responsible for the Brillouin interaction—photoelastic and moving-boundary effects—interplay to foster exciting possibilities in this field. In order to stimulate beginners into this growing research field, this tutorial is accompanied by all the discussed simulation material based on a widespread commercial finite-element solver.The interaction between light and mesoscopic mechanical degrees of freedom has been investigated under various perspectives, from spectroscopy in condensed matter, optical tweezer particle trapping, and long-haul optical fiber communication system penalties to gravitational-wave detector noise. In the context of integrated photonics, two topics with dissimilar origins—cavity optomechanics and guided wave Brillouin scattering—are rooted in the manipulation and control of the energy exchange between trapped light and mechanical modes. In this tutorial, we explore the impact of optical and mechanical subwavelength confinement on the interaction among these waves, coined as Brillouin optomechanics. At this spatial scale, optical and mechanical fields are fully vectorial and the common intuition that more intense fields lead to stronger interaction may fail. Here, we provide a thorough discussion on how the two major physical effects responsible for the Brillouin interaction—photoelastic and moving-boundary ef...},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Barnard:2019aa,

title = {Real-time vibrations of a carbon nanotube},

author = {Arthur W Barnard and Mian Zhang and Gustavo S Wiederhecker and Michal Lipson and Paul L McEuen},

url = {https://doi.org/10.1038/s41586-018-0861-0},

doi = {10.1038/s41586-018-0861-0},

isbn = {1476-4687},

year  = {2019},

date = {2019-01-01},

journal = {Nature},

volume = {566},

number = {7742},

pages = {89--93},

abstract = {The field of miniature mechanical oscillators is rapidly evolving, with emerging applications including signal processing, biological detection1 and fundamental tests of quantum mechanics2. As the dimensions of a mechanical oscillator shrink to the molecular scale, such as in a carbon nanotube resonator3--7, their vibrations become increasingly coupled and strongly interacting8,9 until even weak thermal fluctuations could make the oscillator nonlinear10--13. The mechanics at this scale possesses rich dynamics, unexplored because an efficient way of detecting the motion in real time is lacking. Here we directly measure the thermal vibrations of a carbon nanotube in real time using a high-finesse micrometre-scale silicon nitride optical cavity as a sensitive photonic microscope. With the high displacement sensitivity of 700 fm Hz−1/2 and the fine time resolution of this technique, we were able to discover a realm of dynamics undetected by previous time-averaged measurements and a room-temperature coherence that is nearly three orders of magnitude longer than previously reported. We find that the discrepancy in the coherence stems from long-time non-equilibrium dynamics, analogous to the Fermi--Pasta--Ulam--Tsingou recurrence seen in nonlinear systems14. Our data unveil the emergence of a weakly chaotic mechanical breather15, in which vibrational energy is recurrently shared among several resonance modes---dynamics that we are able to reproduce using a simple numerical model. These experiments open up the study of nonlinear mechanical systems in the Brownian limit (that is, when a system is driven solely by thermal fluctuations) and present an integrated, sensitive, high-bandwidth nanophotonic interface for carbon nanotube resonators.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000432841700001,

title = {Self-Sustained Laser Pulsation in Active Optomechanical Devices},

author = {Debora Princepe and Gustavo S Wiederhecker and Ivan Favero and Newton C Frateschi},

doi = {10.1109/JPHOT.2018.2831001},

issn = {1943-0655},

year  = {2018},

date = {2018-06-01},

journal = {IEEE PHOTONICS JOURNAL},

volume = {10},

number = {3},

publisher = {IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC},

address = {445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA},

abstract = {We developed a model for an active optomechanical cavity embedding a 

 semiconductor optical gain medium in the presence of dispersive and 

 dissipative optomechanical couplings. Radiation pressure drives the 

 mechanical oscillation and the back-action occurs due to the mechanical 

 modulation of the cavity loss rate. Our numerical analysis utilizing 

 this model shows that, even in a wideband gain material, such mechanism 

 couples the mechanical vibration with the laser relaxation oscillation, 

 enabling an effect of self-pulsed laser emission. In order to 

 investigate this effect, we propose a bullseye-shaped device with high 

 confinement of both the optical and the mechanical modes at the edge of 

 a disk combined with a dissipative structure in its vicinity. The 

 dispersive interaction is promoted by the strong photoelastic effect 

 while the dissipative mechanism is governed by the boundary motion 

 mechanism, enhanced by near-field interaction with the absorptive 

 structure. This hybrid optomechanical device is shown to lead sufficient 

 coupling for the experimental demonstration of the self-pulsed emission.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Souza2018,

title = {Fourier transform spectrometer on silicon with thermo-optic  non-linearity and dispersion correction},

author = {Mario C M M Souza and Andrew Grieco and Newton C Frateschi and Yeshaiahu Fainman},

url = {https://doi.org/10.1038/s41467-018-03004-6},

doi = {10.1038/s41467-018-03004-6},

issn = {2041-1723},

year  = {2018},

date = {2018-02-01},

journal = {NATURE COMMUNICATIONS},

volume = {9},

publisher = {NATURE PUBLISHING GROUP},

address = {MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND},

abstract = {Miniaturized integrated spectrometers will have unprecedented impact on 

 applications ranging from unmanned aerial vehicles to mobile phones, and 

 silicon photonics promises to deliver compact, cost-effective devices. 

 Mirroring its ubiquitous free-space counterpart, a silicon 

 photonics-based Fourier transform spectrometer (Si-FTS) can bring 

 broadband operation and fine resolution to the chip scale. Here we 

 present the modeling and experimental demonstration of a thermally tuned 

 Si-FTS accounting for dispersion, thermo-optic non-linearity, and 

 thermal expansion. We show how these effects modify the relation between 

 the spectrum and interferogram of a light source and we develop a 

 quantitative correction procedure through calibration with a tunable 

 laser. We retrieve a broadband spectrum (7 THz around 193.4 THz with 

 0.38-THz resolution consuming 2.5W per heater) and demonstrate the 

 Si-FTS resilience to fabrication variations - a major advantage for 

 large-scale manufacturing. Providing design flexibility and robustness, 

 the Si-FTS is poised to become a fundamental building block for on-chip 

 spectroscopy.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{primo2020dissipative,

title = {Quasinormal-Mode Perturbation Theory for Dissipative and Dispersive Optomechanics},

author = {André G Primo and Natália C Carvalho and Cau{ê} M Kersul and Newton C Frateschi and Gustavo S Wiederhecker and Thiago Mayer P Alegre},

url = {http://arxiv.org/abs/2006.00692 https://link.aps.org/doi/10.1103/PhysRevLett.125.233601},

doi = {10.1103/PhysRevLett.125.233601},

issn = {0031-9007},

year  = {2020},

date = {2020-12-01},

journal = {Physical Review Letters},

volume = {125},

number = {23},

pages = {233601},

abstract = {Despite the several novel features arising from the dissipative optomechanical coupling, such effect remains vastly unexplored due to the lack of a simple formalism that captures non-Hermiticity in optomechanical systems. In this Letter, we show that quasinormal-mode-based perturbation theory is capable of correctly predicting both dispersive and dissipative optomechanical couplings. We validate our model through simulations and also by comparison with experimental results reported in the literature. Finally, we apply this formalism to plasmonic systems, used for molecular optomechanics, where strong dissipative coupling signatures in the amplification of vibrational modes are observed.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Inga2020,

title = {Alumina coating for dispersion management in ultra-high Q microresonators},

author = {Marvyn Inga and Laís Fujii and José Maria C {da Silva Filho} and Jo{ã}o Henrique {Quintino Palhares} and Andre Santarosa Ferlauto and Francisco C Marques and Thiago P {Mayer Alegre} and Gustavo Wiederhecker},

url = {http://aip.scitation.org/doi/10.1063/5.0028839},

doi = {10.1063/5.0028839},

issn = {2378-0967},

year  = {2020},

date = {2020-11-01},

journal = {APL Photonics},

volume = {5},

number = {11},

pages = {116107},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{li2020proposal,

title = {Proposal for optomechanical quantum teleportation},

author = {Jie Li and Andreas Wallucks and Rodrigo Benevides and Niccolo Fiaschi and Bas Hensen and Thiago Mayer P Alegre and Simon Gröblacher},

url = {http://arxiv.org/abs/2005.08860 http://dx.doi.org/10.1103/PhysRevA.102.032402 https://link.aps.org/doi/10.1103/PhysRevA.102.032402},

doi = {10.1103/PhysRevA.102.032402},

issn = {2469-9926},

year  = {2020},

date = {2020-09-01},

journal = {Physical Review A},

volume = {102},

number = {3},

pages = {032402},

abstract = {We present a novel discrete-variable quantum teleportation scheme using pulsed optomechanics. In our proposal, we demonstrate how an unknown optical input state can be transferred onto the joint state of a pair of mechanical oscillators, without physically interacting with one another. We further analyze how experimental imperfections will affect the fidelity of the teleportation and highlight how our scheme can be realized in current state-of-the-art optomechanical systems.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fujii2020,

title = {Dispersion tailoring in wedge microcavities for Kerr comb generation},

author = {L Fujii and M Inga and J H Soares and Y A V Espinel and T P {Mayer Alegre} and G S Wiederhecker},

url = {https://www.osapublishing.org/abstract.cfm?URI=ol-45-12-3232},

doi = {10.1364/ol.393294},

issn = {0146-9592},

year  = {2020},

date = {2020-06-01},

journal = {Optics Letters},

volume = {45},

number = {12},

pages = {3232},

abstract = {The shaping of group velocity dispersion in microresonators is an important component in the generation of wideband optical frequency combs. Small resonators - with tight bending radii - offer the large free-spectral range desirable for wide comb formation. However, the tighter bending usually limit comb formation as it enhances normal group velocity dispersion. We experimentally demonstrate that engineering the sidewall angle of small-radius (100 $mu$m), 3 $mu$m-thick silica wedge microdisks enables dispersion tuning in both normal and anomalous regimes, without significantly affecting the free spectral range. A microdisk with wedge angle of $55^circ$ (anomalous dispersion) is used to demonstrate a 300 nm bandwidth Kerr optical frequency comb.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Melo2020,

title = {Bright and Vivid Diffractive–Plasmonic Reflective Filters for Color Generation},

author = {Emerson G Melo and Ana L A Ribeiro and Rodrigo S Benevides and Antonio A G V Zuben and Marcos V {Puydinger dos Santos} and Alexandre A Silva and Gustavo S Wiederhecker and Thiago P M Alegre},

url = {https://pubs.acs.org/doi/10.1021/acsanm.9b02508},

doi = {10.1021/acsanm.9b02508},

issn = {2574-0970},

year  = {2020},

date = {2020-02-01},

journal = {ACS Applied Nano Materials},

volume = {3},

number = {2},

pages = {1111--1117},

abstract = {The desire to reproduce vivid colors such as those found in birds, fishes, flowers, and insects has driven extensive research into nanostructured surfaces especially because of their high spatial resolution. Using a periodic silicon-patterned structure coated with aluminum, we combine two distinct and yet interconnected effects to produce bright and vivid color surfaces. A genetic algorithm optimization process was used to fine-tune both the diffraction and plasmonic effects to obtain reflective color filters for the red, green, and blue colors. The obtained structures are suitable for displays, image applications, color sensors, and optical filters.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Benevides2020,

title = { Ar/Cl 2 etching of GaAs optomechanical microdisks fabricated with positive electroresist },

author = {Rodrigo Benevides and Micha{ë}l Ménard and Gustavo S Wiederhecker and Thiago P {Mayer Alegre}},

url = {https://www.osapublishing.org/abstract.cfm?URI=ome-10-1-57},

doi = {10.1364/OME.10.000057},

issn = {2159-3930},

year  = {2020},

date = {2020-01-01},

journal = {Optical Materials Express},

volume = {10},

number = {1},

pages = {57},

abstract = {A method to fabricate GaAs microcavities using only a soft mask with an electrolithographic pattern in an inductively coupled plasma etching is presented. A careful characterization of the fabrication process pinpointing the main routes for a smooth device sidewall is discussed. Using the final recipe, optomechanical microdisk resonators are fabricated. The results show a very high optical quality factors of $Q_textopt>2times 10^5$, among the largest already reported for dry-etching devices. The final devices are also shown to present high mechanical quality factors and an optomechanical vacuum coupling constant of $g_0=2pitimes 13.6$ kHz enabling self-sustainable mechanical oscillations for an optical input power above $1$ mW.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Barnard:2019aa,

title = {Real-time vibrations of a carbon nanotube},

author = {Arthur W Barnard and Mian Zhang and Gustavo S Wiederhecker and Michal Lipson and Paul L McEuen},

url = {https://doi.org/10.1038/s41586-018-0861-0},

doi = {10.1038/s41586-018-0861-0},

isbn = {1476-4687},

year  = {2019},

date = {2019-01-01},

journal = {Nature},

volume = {566},

number = {7742},

pages = {89--93},

abstract = {The field of miniature mechanical oscillators is rapidly evolving, with emerging applications including signal processing, biological detection1 and fundamental tests of quantum mechanics2. As the dimensions of a mechanical oscillator shrink to the molecular scale, such as in a carbon nanotube resonator3--7, their vibrations become increasingly coupled and strongly interacting8,9 until even weak thermal fluctuations could make the oscillator nonlinear10--13. The mechanics at this scale possesses rich dynamics, unexplored because an efficient way of detecting the motion in real time is lacking. Here we directly measure the thermal vibrations of a carbon nanotube in real time using a high-finesse micrometre-scale silicon nitride optical cavity as a sensitive photonic microscope. With the high displacement sensitivity of 700 fm Hz−1/2 and the fine time resolution of this technique, we were able to discover a realm of dynamics undetected by previous time-averaged measurements and a room-temperature coherence that is nearly three orders of magnitude longer than previously reported. We find that the discrepancy in the coherence stems from long-time non-equilibrium dynamics, analogous to the Fermi--Pasta--Ulam--Tsingou recurrence seen in nonlinear systems14. Our data unveil the emergence of a weakly chaotic mechanical breather15, in which vibrational energy is recurrently shared among several resonance modes---dynamics that we are able to reproduce using a simple numerical model. These experiments open up the study of nonlinear mechanical systems in the Brownian limit (that is, when a system is driven solely by thermal fluctuations) and present an integrated, sensitive, high-bandwidth nanophotonic interface for carbon nanotube resonators.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wiederhecker:2019ey,

title = {Brillouin optomechanics in nanophotonic structures},

author = {Gustavo S Wiederhecker and Paulo Dainese and Thiago Mayer P Alegre},

url = {http://aip.scitation.org/doi/10.1063/1.5088169},

doi = {10.1063/1.5088169},

year  = {2019},

date = {2019-01-01},

journal = {APL Photonic},

volume = {4},

number = {7},

pages = {071101},

publisher = {AIP Publishing LLC},

abstract = {The interaction between light and mesoscopic mechanical degrees of freedom has been investigated under various perspectives, from spectroscopy in condensed matter, optical tweezer particle trapping, and long-haul optical fiber communication system penalties to gravitational-wave detector noise. In the context of integrated photonics, two topics with dissimilar origins—cavity optomechanics and guided wave Brillouin scattering—are rooted in the manipulation and control of the energy exchange between trapped light and mechanical modes. In this tutorial, we explore the impact of optical and mechanical subwavelength confinement on the interaction among these waves, coined as Brillouin optomechanics. At this spatial scale, optical and mechanical fields are fully vectorial and the common intuition that more intense fields lead to stronger interaction may fail. Here, we provide a thorough discussion on how the two major physical effects responsible for the Brillouin interaction—photoelastic and moving-boundary effects—interplay to foster exciting possibilities in this field. In order to stimulate beginners into this growing research field, this tutorial is accompanied by all the discussed simulation material based on a widespread commercial finite-element solver.The interaction between light and mesoscopic mechanical degrees of freedom has been investigated under various perspectives, from spectroscopy in condensed matter, optical tweezer particle trapping, and long-haul optical fiber communication system penalties to gravitational-wave detector noise. In the context of integrated photonics, two topics with dissimilar origins—cavity optomechanics and guided wave Brillouin scattering—are rooted in the manipulation and control of the energy exchange between trapped light and mechanical modes. In this tutorial, we explore the impact of optical and mechanical subwavelength confinement on the interaction among these waves, coined as Brillouin optomechanics. At this spatial scale, optical and mechanical fields are fully vectorial and the common intuition that more intense fields lead to stronger interaction may fail. Here, we provide a thorough discussion on how the two major physical effects responsible for the Brillouin interaction—photoelastic and moving-boundary ef...},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000432841700001,

title = {Self-Sustained Laser Pulsation in Active Optomechanical Devices},

author = {Debora Princepe and Gustavo S Wiederhecker and Ivan Favero and Newton C Frateschi},

doi = {10.1109/JPHOT.2018.2831001},

issn = {1943-0655},

year  = {2018},

date = {2018-06-01},

journal = {IEEE PHOTONICS JOURNAL},

volume = {10},

number = {3},

publisher = {IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC},

address = {445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA},

abstract = {We developed a model for an active optomechanical cavity embedding a 

 semiconductor optical gain medium in the presence of dispersive and 

 dissipative optomechanical couplings. Radiation pressure drives the 

 mechanical oscillation and the back-action occurs due to the mechanical 

 modulation of the cavity loss rate. Our numerical analysis utilizing 

 this model shows that, even in a wideband gain material, such mechanism 

 couples the mechanical vibration with the laser relaxation oscillation, 

 enabling an effect of self-pulsed laser emission. In order to 

 investigate this effect, we propose a bullseye-shaped device with high 

 confinement of both the optical and the mechanical modes at the edge of 

 a disk combined with a dissipative structure in its vicinity. The 

 dispersive interaction is promoted by the strong photoelastic effect 

 while the dissipative mechanism is governed by the boundary motion 

 mechanism, enhanced by near-field interaction with the absorptive 

 structure. This hybrid optomechanical device is shown to lead sufficient 

 coupling for the experimental demonstration of the self-pulsed emission.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Souza2018,

title = {Fourier transform spectrometer on silicon with thermo-optic  non-linearity and dispersion correction},

author = {Mario C M M Souza and Andrew Grieco and Newton C Frateschi and Yeshaiahu Fainman},

url = {https://doi.org/10.1038/s41467-018-03004-6},

doi = {10.1038/s41467-018-03004-6},

issn = {2041-1723},

year  = {2018},

date = {2018-02-01},

journal = {NATURE COMMUNICATIONS},

volume = {9},

publisher = {NATURE PUBLISHING GROUP},

address = {MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND},

abstract = {Miniaturized integrated spectrometers will have unprecedented impact on 

 applications ranging from unmanned aerial vehicles to mobile phones, and 

 silicon photonics promises to deliver compact, cost-effective devices. 

 Mirroring its ubiquitous free-space counterpart, a silicon 

 photonics-based Fourier transform spectrometer (Si-FTS) can bring 

 broadband operation and fine resolution to the chip scale. Here we 

 present the modeling and experimental demonstration of a thermally tuned 

 Si-FTS accounting for dispersion, thermo-optic non-linearity, and 

 thermal expansion. We show how these effects modify the relation between 

 the spectrum and interferogram of a light source and we develop a 

 quantitative correction procedure through calibration with a tunable 

 laser. We retrieve a broadband spectrum (7 THz around 193.4 THz with 

 0.38-THz resolution consuming 2.5W per heater) and demonstrate the 

 Si-FTS resilience to fabrication variations - a major advantage for 

 large-scale manufacturing. Providing design flexibility and robustness, 

 the Si-FTS is poised to become a fundamental building block for on-chip 

 spectroscopy.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Luiz:17,

title = {Efficient anchor loss suppression in coupled near-field optomechanical resonators},

author = {Gustavo O Luiz and Rodrigo S Benevides and Felipe G S Santos and Yovanny A V Espinel and Thiago Mayer P Alegre and Gustavo S Wiederhecker},

url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-25-25-31347},

doi = {10.1364/OE.25.031347},

year  = {2017},

date = {2017-12-01},

journal = {Opt. Express},

volume = {25},

number = {25},

pages = {31347--31361},

publisher = {OSA},

abstract = {Elastic dissipation through radiation towards the substrate is a major loss channel in micro- and nanomechanical resonators. Engineering the coupling of these resonators with optical cavities further complicates and constrains the design of low-loss optomechanical devices. In this work we rely on the coherent cancellation of mechanical radiation to demonstrate material and surface absorption limited silicon near-field optomechanical resonators oscillating at tens of MHz. The effectiveness of our dissipation suppression scheme is investigated at room and cryogenic temperatures. While at room temperature we can reach a maximum quality factor of 7.61k (fQ-product of the order of 1011 Hz), at 22 K the quality factor increases to 37k, resulting in a fQ-product of 2 × 1012 Hz.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000407815100078,

title = {Hybrid multimode resonators based on grating-assisted 

 counter-directional couplers},

author = {Jordan A Davis and Andrew Grieco and Mario C M M Souza and Newton C Frateschi and Yeshaiahu Fainman},

doi = {10.1364/OE.25.016484},

issn = {1094-4087},

year  = {2017},

date = {2017-07-01},

journal = {OPTICS EXPRESS},

volume = {25},

number = {14},

pages = {16484-16490},

publisher = {OPTICAL SOC AMER},

address = {2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA},

abstract = {Research thrusts in silicon photonics are developing control operations 

 using higher order waveguide modes for next generation high-bandwidth 

 communication systems. In this context, devices allowing optical 

 processing of multiple waveguide modes can reduce architecture 

 complexity and enable flexible on-chip networks. We propose and 

 demonstrate a hybrid resonator dually resonant at the 1st and 2nd order 

 modes of a silicon waveguide. We observe 8 dB extinction ratio and modal 

 conversion range of 20 nm for the 1st order quasi-TE mode input. (C) 

 2017 Optical Society of America},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Espinel:2017aa,

title = {Brillouin Optomechanics in Coupled Silicon Microcavities},

author = {Espinel, Y. A. V. and Santos, F. G. S. and Luiz, G. O. and Alegre, T. P. Mayer and Wiederhecker, G. S.},

url = {http://dx.doi.org/10.1038/srep43423

https://arxiv.org/abs/1609.09509},

year  = {2017},

date = {2017-03-06},

journal = {Scientific Reports},

volume = {7},

pages = {43423 EP -},

publisher = {The Author(s) SN -},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Santos:17,

title = {Hybrid confinement of optical and mechanical modes in a bullseye optomechanical resonator},

author = {Felipe G. S. Santos and Yovanny A. V. Espinel and Gustavo O. Luiz and Rodrigo S. Benevides and Gustavo S. Wiederhecker and Thiago P. Mayer Alegre},

url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-25-2-508

https://arxiv.org/abs/1605.06318},

doi = {10.1364/OE.25.000508},

year  = {2017},

date = {2017-01-01},

journal = {Opt. Express},

volume = {25},

number = {2},

pages = {508--529},

publisher = {OSA},

abstract = {Optomechanical cavities have proven to be an exceptional tool to explore fundamental and applied aspects of the interaction between mechanical and optical waves. Here we demonstrate a novel optomechanical cavity based on a disk with a radial mechanical bandgap. This design confines light and mechanical waves through distinct physical mechanisms which allows for independent control of the mechanical and optical properties. Simulations foresee an optomechanical coupling rate g0 reaching 2π × 100 kHz for mechanical frequencies around 5 GHz as well as anchor loss suppression of 60 dB. Our device design is not limited by unique material properties and could be easily adapted to allow for large optomechanical coupling and high mechanical quality factors with other promising materials. Finally, our devices were fabricated in a commercial silicon photonics facility, demonstrating g0/2π $=$ 23 kHz for mechanical modes with frequencies around 2 GHz and mechanical Q-factors as high as 2300 at room temperature, also showing that our approach can be easily scalable and useful as a new platform for multimode optomechanics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Benevides:2017aa,

title = {Ultrahigh-Q optomechanical crystal cavities fabricated in a CMOS foundry},

author = {Benevides, Rodrigo and Santos, Felipe G. S. and Luiz, Gustavo O. and Wiederhecker, Gustavo S. and Alegre, Thiago P. Mayer},

url = {http://dx.doi.org/10.1038/s41598-017-02515-4},

doi = {10.1038/s41598-017-02515-4},

isbn = {2045-2322},

year  = {2017},

date = {2017-01-01},

journal = {Scientific Reports},

volume = {7},

number = {1},

pages = {2491},

abstract = {Photonic crystals use periodic structures to create frequency regions where the optical wave propagation is forbidden, which allows the creation and integration of complex optical functionalities in small footprint devices. Such strategy has also been successfully applied to confine mechanical waves and to explore their interaction with light in the so-called optomechanical cavities. Because of their challenging design, these cavities are traditionally fabricated using dedicated high-resolution electron-beam lithography tools that are inherently slow, limiting this solution to small-scale or research applications. Here we show how to overcome this problem by using a deep-UV photolithography process to fabricate optomechanical crystals in a commercial CMOS foundry. We show that a careful design of the photonic crystals can withstand the limitations of the photolithography process, producing cavities with measured intrinsic optical quality factors as high as Q i = (1.21 $pm$0.02) ×106. Optomechanical crystals are also created using phononic crystals to tightly confine the GHz sound waves within the optical cavity, resulting in a measured vacuum optomechanical coupling rate of g 0 = 2π×(91 $pm$4) kHz. Efficient sideband cooling and amplification are also demonstrated since these cavities are in the resolved sideband regime. Further improvements in the design and fabrication process suggest that commercial foundry-based optomechanical cavities could be used for quantum ground-state cooling.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ISI:000389654000042,

title = {Magnetically controllable silicon microring with ferrofluid cladding},

author = {A El Amili and M C M M Souza and F Vallini and N C Frateschi and Y Fainman},

doi = {10.1364/OL.41.005576},

issn = {0146-9592},

year  = {2016},

date = {2016-12-01},

journal = {OPTICS LETTERS},

volume = {41},

number = {23},

pages = {5576-5579},

publisher = {OPTICAL SOC AMER},

address = {2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA},

abstract = {We experimentally investigate the application of magnetic fluids (MFs) 

 on integrated silicon photonics. Using a ferro-fluid-clad silicon 

 microring resonator, we demonstrate active control of resonances by 

 applying an external magnetic field. Relatively high loaded quality 

 factors on the order of 6000 are achieved, despite the optical losses 

 introduced by the magnetic nanoparticles. We demonstrate resonance 

 shifts of 185 pm in response to a 110 Oe strong magnetic field, 

 corresponding to an overall refractive index change of -3.2 x 10(-3) for 

 the cladding MF. The combination of MFs and integrated photonics could 

 potentially lead to the development of magnetically controllable optical 

 devices and ultra-compact cost-effective magnetic field sensors. (C) 

 2016 Optical Society of America},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Souza:2016aa,

title = {Modeling quasi-dark states with temporal coupled-mode theory},

author = {Mario C. M. M. Souza and Guilherme F. M. Rezende and Luis A. M. Barea and Gustavo S. Wiederhecker and Newton C. Frateschi},

url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-24-17-18960},

doi = {10.1364/OE.24.018960},

year  = {2016},

date = {2016-08-01},

journal = {Opt. Express},

volume = {24},

number = {17},

pages = {18960--18972},

publisher = {OSA},

abstract = {Coupled resonators are commonly used to achieve tailored spectral responses and allow novel functionalities in a broad range of applications. The Temporal Coupled-Mode Theory (TCMT) provides a simple and general tool that is widely used to model these devices. Relying on TCMT to model coupled resonators might however be misleading in some circumstances due to the lumped-element nature of the model. In this article, we report an important limitation of TCMT related to the prediction of dark states. Studying a coupled system composed of three microring resonators, we demonstrate that TCMT predicts the existence of a dark state that is in disagreement with experimental observations and with the more general results obtained with the Transfer Matrix Method (TMM) and the Finite-Difference Time-Domain (FDTD) simulations. We identify the limitation in the TCMT model to be related to the mechanism of excitation/decay of the supermodes and we propose a correction that effectively reconciles the model with expected results. Our discussion based on coupled microring resonators can be useful for other electromagnetic resonant systems due to the generality and far-reach of the TCMT formalism.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Florez:2016iz,

title = {Brillouin scattering self-cancellation},

author = {Florez, O and Jarschel, P F and Espinel, Y A V and Cordeiro, C M B and Mayer Alegre, T P and Wiederhecker, G S and Dainese, P},

url = {http://www.nature.com/doifinder/10.1038/ncomms11759

https://arxiv.org/abs/1601.05248},

doi = {10.1038/ncomms11759},

year  = {2016},

date = {2016-01-01},

journal = {Nature Communications},

volume = {7},

pages = {11759},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Souza:15,

title = {Spectral engineering with coupled microcavities: active control of resonant mode-splitting},

author = {Mario C. M. M. Souza and Guilherme F. M. Rezende and Luis A. M. Barea and Antonio A. G. von Zuben and Gustavo S. Wiederhecker and Newton C. Frateschi},

url = {http://ol.osa.org/abstract.cfm?URI=ol-40-14-3332},

doi = {10.1364/OL.40.003332},

year  = {2015},

date = {2015-07-01},

journal = {Opt. Lett.},

volume = {40},

number = {14},

pages = {3332--3335},

publisher = {OSA},

abstract = {Optical mode-splitting is an efficient tool to shape and fine-tune the spectral response of resonant nanophotonic devices. The active control of mode-splitting, however, is either small or accompanied by undesired resonance-shifts, often much larger than the resonance splitting. We report a control mechanism that enables reconfigurable and widely tunable mode splitting while efficiently mitigating undesired resonance shifts. This is achieved by actively controlling the excitation of counter-traveling modes in coupled resonators. The transition from a large splitting (80 GHz) to a single-notch resonance is demonstrated using low-power microheaters (35 mW). We show that the spurious resonance shift in our device is only limited by thermal crosstalk, and resonance-shift-free splitting control may be achieved.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Souza201410430,

title = {Embedded coupled microrings with high-finesse and close-spaced resonances for optical signal processing},

author = {Souza, M.C.M.M. and Barea, L.A.M. and Vallini, F. and Rezende, G.F.M. and Wiederhecker, G.S. and Frateschi, N.C.},

url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84899854737&partnerID=40&md5=7e75faaeebcfccc28776dcf2cc3635d9},

doi = {10.1364/OE.22.010430},

year  = {2014},

date = {2014-01-01},

journal = {Optics Express},

volume = {22},

number = {9},

pages = {10430-10438},

abstract = {Single microring resonators have been used in applications such as wavelength multicasting and microwave photonics, but the dependence of the free spectral range with ring radius imposes a trade-off between the required GHz optical channel spacing, footprint and power consumption. We demonstrate four-channel all-optical wavelength multicasting using only 1 mW of control power, with converted channel spacing of 40-60 GHz. Our device is based on a compact embedded microring design fabricated on a scalable SOI platform. The coexistence of close resonance spacing and high finesse (205) in a compact footprint is possible due to enhanced quality factors (30,000) resulting from the embedded configuration and the coupling-strength dependence of resonance spacing, instead of ring size. In addition, we discuss the possibility of achieving continuously mode splitting from a single-notch resonance up to 40 GHz. copyright 2014 Optical Society of America.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gu2014499,

title = {Amorphous Al2O3 shield for thermal management in electrically pumped metallo-dielectric nanolasers},

author = {Gu, Q.a and Shane, J.a and Vallini, F.b and Wingad, B.a and Smalley, J.S.T.a and Frateschi, N.C.b and Fainman, Y.a},

url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84901332397&partnerID=40&md5=60c6d9b35f5a951fecb6ca959ac73556},

doi = {10.1109/JQE.2014.2321746},

year  = {2014},

date = {2014-01-01},

journal = {IEEE Journal of Quantum Electronics},

volume = {50},

number = {7},

pages = {499-509},

abstract = {We analyze amorphous Al2O3 (α-Al 2O3) for use as a thick thermally conductive shield in metallo-dielectric semiconductor nanolasers, and show that the use of (alpha ) -Al2O3 allows a laser to efficiently dissipate heat through its shield. This new mechanism for thermal management leads to a significantly lower operating temperature within the laser, compared with lasers with less thermally conductive shields, such as SiO2. We implement the shield in a continuous wave electrically pumped cavity, and analyze its experimental performance by jointly investigating its optical, electrical, thermal, and material gain properties. Our analysis shows that the primary obstacle to room temperature lasing was the device's high threshold gain. At the high pump levels required to achieve the gain threshold, particularly at room temperature, the gain spectrum broadened and shifted, leading to detrimental mode competition. Further simulations predict that an increase in the pedestal undercut depth should enable room temperature lasing in a device with the same footprint and gain volume. Through the integrated treatment of various physical effects, this analysis shows the promise of (α-Al2O3 for nanolaser thermal management, and enables better understanding of nanolaser behavior, as well as more informed design of reliable nanolasers. copyright 2014 IEEE.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Zhang2014,

title = {Eliminating anchor loss in optomechanical resonators using elastic wave interference},

author = {Zhang, M.a and Luiz, G.b and Shah, S.a and Wiederhecker, G.b and Lipson, M.a c},

url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84905671257&partnerID=40&md5=548b8970d7257673a286f6684b0406c3},

doi = {10.1063/1.4892417},

year  = {2014},

date = {2014-01-01},

journal = {Applied Physics Letters},

volume = {105},

number = {5},

abstract = {Optomechanical resonators suffer from the dissipation of mechanical energy through the necessary anchors enabling the suspension of the structure. Here, we show that such structural loss in an optomechanical oscillator can be almost completely eliminated through the destructive interference of elastic waves using dual-disk structures. We also present both analytical and numerical models that predict the observed interference of elastic waves. Our experimental data reveal unstressed silicon nitride (Si3N4) devices with mechanical Q-factors up to 104 at mechanical frequencies of f=102 MHz (fQ=1012) at room temperature. copyright 2014 AIP Publishing LLC.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}