National Institute of Advanced Industrial Science and Technology, Central 2, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan.
Opt Lett. 2010 Jun 15;35(12):1989-91. doi: 10.1364/OL.35.001989.
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.
腔-谐振器集成光栅输入/输出耦合器 (CRIGIC) 设计用于在约 850nm 波长下工作，以实现小孔径下导波和自由空间波的高效率垂直耦合。CRIGIC 由光栅耦合器和由两个分布式布拉格反射器构成的波导腔谐振器组成。理论计算预测耦合效率为 96%，3dB 带宽为 1.2nm。我们在一个基于薄膜 SiO(2)的波导上的衬底上制作了一个带有 Au 反射层的 20μm 孔径器件，首次实验证明了约 60%的输出耦合效率。
