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19 February 2014 High-order grating coupler for high-efficiency vertical to in-plane coupling
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Proceedings Volume 8995, High Contrast Metastructures III; 89950W (2014)
Event: SPIE OPTO, 2014, San Francisco, California, United States
We present here the design of a robust broadband high efficiency surface-normal vertical to in-plane optical coupler using fourth-order gratings. The fourth-order gratings can be designed such that the zero-order diffraction is suppressed while the diffraction efficiencies of the higher orders are enhanced for the in-plane coupling. We numerically demonstrated the surface normal incidence light coupling efficiency of 88.5% at 1,535 nm with a 3 dB bandwidth of 42 nm and 1dB bandwidth of 28 nm. Large fabrication tolerance of the fourth-order grating is also assessed.
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Arvinder Singh Chadha, Yichen Shuai, and Weidong Zhou "High-order grating coupler for high-efficiency vertical to in-plane coupling", Proc. SPIE 8995, High Contrast Metastructures III, 89950W (19 February 2014);

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