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  • Title: Cavity-resonator-integrated grating input/output coupler for high-efficiency vertical coupling with a small aperture.
    Author: Kintaka K, Kita Y, Shimizu K, Matsuoka H, Ura S, Nishii J.
    Journal: Opt Lett; 2010 Jun 15; 35(12):1989-91. PubMed ID: 20548362.
    Abstract:
    A cavity-resonator-integrated grating input/output coupler (CRIGIC) is designed to operate at about 850 nm wavelength for high-efficiency vertical coupling of a guided wave and a free-space wave with a small aperture. The CRIGIC consists of a grating coupler and a waveguide cavity resonator constructed by two distributed Bragg reflectors. A coupling efficiency of 96% with a 3 dB bandwidth of 1.2 nm is predicted by a theoretical calculation. An output coupling efficiency of about 60% is experimentally demonstrated on a 20 microm aperture device, fabricated in a thin-film SiO(2)-based waveguide on a substrate with an Au reflection layer, for what we believe to be the first time.
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