23 February 2012 Novel high efficiency vertical to in-plane optical coupler
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Proceedings Volume 8270, High Contrast Metastructures; 82700L (2012) https://doi.org/10.1117/12.909414
Event: SPIE OPTO, 2012, San Francisco, California, United States
We propose a novel vertical optical coupler using subwavelength high contrast grating. The surface normal incidence light can be coupled into the in-plane waveguide with peak efficiency of 92% over a broad wavelength range. Such structure can be also designed as the in-plane reflector or in-plane to vertical coupler. The reflectivity for waveguide propagation mode is 97.5% and the coupling efficiency is 96%, respectively.
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Li Zhu, Vadim Karagodsky, Connie Chang-Hasnain, "Novel high efficiency vertical to in-plane optical coupler", Proc. SPIE 8270, High Contrast Metastructures, 82700L (23 February 2012); doi: 10.1117/12.909414; https://doi.org/10.1117/12.909414

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