Title :

Vertical Engineering for Large Brillouin Gain in Unreleased Silicon-Based Waveguides

Author(s) :

Mercadé, L. [Auteur]
Korovin, A.V. [Auteur]
Pennec, Yan [Auteur]
Physique - IEMN [PHYSIQUE - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Ahopelto, J. [Auteur]
Djafari-Rouhani, Bahram [Auteur]
Physique - IEMN [PHYSIQUE - IEMN]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Martínez, A. []

Journal title :

Physical Review Applied

Pages :

034021

Publisher :

American Physical Society

Publication date :

2021

ISSN :

2331-7019

English keyword(s) :

Acoustic resonators
Optical waveguides
Optomechanics
Silica
Silicon nitride
Acousto-optic interaction
Cryogenic temperatures
Gigahertz frequencies
High index waveguides
Mechanical robustness
Multiple applications
Photonic technologies
Specific properties
Substrates

HAL domain(s) :

Physique [physics]

English abstract : [en]

Strong acousto-optic interaction in high-index waveguides and cavities generally requires the releasing of the high-index core to avoid mechanical leakage into the underlying low-index substrate. This complicates fabrication, ...
Show more >Strong acousto-optic interaction in high-index waveguides and cavities generally requires the releasing of the high-index core to avoid mechanical leakage into the underlying low-index substrate. This complicates fabrication, limits thermalization, reduces the mechanical robustness, and hinders large-area optomechanical devices on a single chip. Here, we overcome this limitation by employing vertical photonic-phononic engineering to drastically reduce mechanical leakage into the cladding by adding a pedestal with specific properties between the core and the cladding. We apply this concept to a silicon-based platform, due to the remarkable properties of silicon to enhance optomechanical interactions and the technological relevance of silicon devices in multiple applications. Specifically, the insertion of a thick silicon nitride layer between the silicon guiding core and the silica substrate contributes to reducing gigahertz-frequency phonon leakage while enabling large values of the Brillouin gain in an unreleased platform. We numerically obtain values of the Brillouin gain around 300(W m)-1 for different configurations, which could be further increased by operation at cryogenic temperatures. These values should enable Brillouin-related phenomena in centimeter-scale waveguides or in more compact ring resonators. Our findings could pave the way toward large-area unreleased-cavity and waveguide optomechanics on silicon and other high-index photonic technologies. © 2021 American Physical Society.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

European Project :

All-Phononic circuits Enabled by Opto-mechanics

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL