GaAs-based air-slot photonic crystal nanocavity for optomechanical oscillators

We theoretically investigate an optomechanical structure consisting of two parallel GaAs membranes with an air-slot type photonic crystal nanocavity. The optical cavity has a quality factor of 4.8 × 10 at 1.52 μm and an extremely small modal volume of 0.015 of a cubic wavelength for the fundamental...

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Bibliographic Details
Published in:Optics express 2012-02, Vol.20 (5), p.5204-5212
Main Author: Nomura, Masahiro
Format: Article
Language:English
Subjects:
Air
Arsenicals - chemistry
Crystallization - methods
Equipment Design
Equipment Failure Analysis
Gallium - chemistry
Micro-Electrical-Mechanical Systems - instrumentation
Nanotechnology - instrumentation
Oscillometry - instrumentation
Photons
Surface Plasmon Resonance - instrumentation
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Summary:We theoretically investigate an optomechanical structure consisting of two parallel GaAs membranes with an air-slot type photonic crystal nanocavity. The optical cavity has a quality factor of 4.8 × 10 at 1.52 μm and an extremely small modal volume of 0.015 of a cubic wavelength for the fundamental mode in a vacuum. The localized electric field near the air/dielectric-object boundary provides a large optomechanical coupling factor of ~990 GHz/nm. The fundamental mechanical mode resonance is 95 MHz and a quality factor is 83,800 at room temperature, nearly seven times higher than that for a similar Si-based structure. This high mechanical quality factor of a GaAs-based structure stems from low thermoelastic loss and leads to more effective optical control of nanomechanical oscillators.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.20.005204