SAMSUNG fellowship

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Oct 022017

Tunable light filters

In this partnership between SAMSUNG and the Device Research Laboratory, the goal is to investigate tunable light filters. The project is led by professors Thiago Alegre and Gustavo Wiederhecker at the Gleb Wataghin Physics Institute in collaboration with scientists at Samsung Research Brazil (SRBR). We are currently searching for outstanding candidates pursuing a Master degree and postdoctoral fellows. To find out more details click here.


Rodrigo's Scientific Reports is out!

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May 302017

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 Qi = (1.21 ± 0.02) × 10^6 . 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 g0 = 2π × (91 ± 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.

Check out the full paper at  

Benevides, Rodrigo, Santos, Felipe G. S., Luiz, Gustavo O., Wiederhecker, Gustavo S., Alegre, Thiago P. Mayer: Ultrahigh-Q optomechanical crystal cavities fabricated in a CMOS foundry. In: Scientific Reports, 7 (1), pp. 2491, 2017, ISBN: 2045-2322.

Brillouin scattering explained

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May 042017

Check out our recent work on Brillouin scattering in coupled silicon microcavities explained by Fapesp!

Dispositivo possibilita explorar espalhamento de luz por vibrações mecânicas  (Portuguese)

Device designed to exploit scattering of light by mechanical vibrations (English)

Espinel, Y. A. V., Santos, F. G. S., Luiz, G. O., Alegre, T. P. Mayer, Wiederhecker, G. S., Brillouin Optomechanics in Coupled Silicon Microcavities., Scientific Reports, 7 , 43423 (2017).


Our recent work on the Bullseye resonator receives media highlight!

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Mar 102017

Check out the full news highlight at OSA website: Researchers Create Practical and Versatile Microscopic Optomechanical Device.

Jornal da Unicamp ha also highlighted the publication:  Alvo microscópico liga luz e movimento. Congratulations to Felipe Santos!

Felipe G. S. Santos, Yovanny A. V. Espinel, Gustavo O. Luiz, Rodrigo S. Benevides, Gustavo S. Wiederhecker, Thiago P. Mayer Alegre: Hybrid confinement of optical and mechanical modes in a bullseye optomechanical resonator. In: Opt. Express, 25 (2), pp. 508–529, 2017.

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