Integrated Photonics Initiative Website

Our new website about the Integrated Photonics Devices initiative is on air! Check the stories and background of research labs that are part of this Thematic grant from Fapesp at:


“Designing of strongly confined short-wave Brillouin phonons in silicon waveguide periodic lattices” is out on OpEx!

Roberto’s beautiful paper is online at Optics Express!

“Quasinormal-Mode Perturbation Theory for Dissipative and Dispersive Optomechanics” on PRL

André and team got their Christmas gift earlier in 2020 with this PRL publication!

Check out the repercussion on several news outlets.

“Alumina coating for dispersion management in ultra-high Q microresonators” highlighted as “featured article” in APL Photonics!

Marvyn’s effort has payed off and his work was chosen as featured article in APL Photonics (November edition)

Marvyn’s dispersion engineering with alumina is on arXiv!

Check out this preprint (! Accompanying datasets and COMSOL simulation scripts are available on Zenodo (

Silica optical microspheres often exhibit ultra-high quality factors, yet, their group velocity dispersion, which is crucial for nonlinear optics applications, can only be coarsely tuned. We experimentally demonstrate that group-velocity dispersion of a silica microsphere can be engineered by coating it with conformal nanometric layers of alumina, yet preserving its ultra-high optical quality factors (\num{\sim e7}) at telecom wavelengths. Using the atomic layer deposition technique for the dielectric coating, which ensures nm-level thickness control, we not only achieve a fine dispersion tailoring but also maintain a low surface roughness and material absorption to ensure a low optical loss. Numerical simulations supporting our experimental results show that the alumina layer thickness is a promising technique for precise tuning of group-velocity dispersion. As an application we demonstrate the generation of Kerr optical frequency combs, showing that the alumina coatings can also sustain the high optical intensities necessary for nonlinear optical phenomena.

Natália’s GaAs bullseye structures pre-print on arXiv!

High-Frequency GaAs Optomechanical Bullseye Resonator

N. C. Carvalho, R. Benevides, M. Ménard, G. S. Wiederhecker, N. C. Frateschi, T. P. M. Alegre

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LPD CLEO 2020 talks

André’s preprint on Non-hermitian Optomechanics is online on arXiv!

Quasinormal-mode perturbation theory for dissipative and dispersive optomechanics

André G. Primo, Natália C. Carvalho, Cauê M. Kersul, Newton C. Frateschi, Gustavo S. Wiederhecker, Thiago P. Mayer Alegre

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Laís paper on Dispersion engineering with Wedge resonators is published in Optics Letters!

Dispersion tailoring in wedge microcavities for Kerr comb generation

Our plasmonic colors just came out in ACS Applied Nano Materials

Congratulations to Emerson and all the team! This is our first paper on plasmonics structures!

Check it out at