Photoelastic coupling in gallium arsenide optomechanical disk resonators
| Autor: | Giuseppe Leo, Christopher G. Baker, Sara Ducci, Ivan Favero, William Hease, Alessio Andronico, Dac-Trung Nguyen |
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| Rok vydání: | 2014 |
| Předmět: |
Coupling
Materials science Electrostriction business.industry Terahertz radiation FOS: Physical sciences Physics::Optics Atomic and Molecular Physics and Optics Gallium arsenide Condensed Matter::Materials Science chemistry.chemical_compound Resonator Semiconductor Optics Radiation pressure chemistry business Refractive index Optics (physics.optics) Physics - Optics |
| Zdroj: | Optics Express |
| ISSN: | 1094-4087 |
| Popis: | We analyze the magnitude of the radiation pressure and electrostrictive stresses exerted by light confined inside GaAs semiconductor WGM optomechanical disk resonators, through analytical and numerical means, and find the electrostrictive force to be of prime importance. We investigate the geometric and photoelastic optomechanical coupling resulting respectively from the deformation of the disk boundary and from the strain-induced refractive index changes in the material, for various mechanical modes of the disks. Photoelastic optomechanical coupling is shown to be a predominant coupling mechanism for certain disk dimensions and mechanical modes, leading to total coupling g$_{om}$ and g$_0$ reaching respectively 3 THz/nm and 4 MHz. Finally, we point towards ways to maximize the photoelastic coupling in GaAs disk resonators, and we provide some upper bounds for its value in various geometries. |
| Databáze: | OpenAIRE |
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