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  • Title: Waveguide coupled air-slot photonic crystal nanocavity for optomechanics.
    Author: Shimizu W, Nagai N, Kohno K, Hirakawa K, Nomura M.
    Journal: Opt Express; 2013 Sep 23; 21(19):21961-9. PubMed ID: 24104089.
    Abstract:
    We investigate a structure consisting of two parallel GaAs thin membranes with an air-slot type photonic crystal (PhC) nanocavity, which is designed to achieve highly efficient optomechanical coupling. The structure shows a large theoretical optomechanical coupling factor of ~990 GHz/nm. We designed, fabricated, and performed optical characterization of a system consisting of a grating coupler, a PhC waveguide, and a PhC nanocavity, which achieves highly efficient vertical emission using the band folding technique. The experimentally obtained overall efficiency is about 0.3% for a microscope objective lens with a moderate numerical aperture of 0.65. This waveguide coupled air-slot PhC nanocavity with efficient vertical light coupling can be useful for on-chip cavity optomechanical systems.
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