铌酸锂
硅
栅栏
材料科学
光电子学
锂(药物)
对偶(语法数字)
CMOS芯片
医学
艺术
文学类
内分泌学
作者
Nina Xiong,Jing Wang,H. J. Yang,Bowen Ma,Weiwen Zou
摘要
We present the design and experimental demonstration of multilayer etched CMOS-compatible grating couplers with high efficiency on a heterogeneous silicon-lithium niobate platform. The dual-level grating coupler comprises 90 nm-thick Si waveguides and 220 nm-thick Si grating with a linear chirped structure without etching LN. The design changes the grating diffraction properties, which not only reduce back reflection but also improve directionality and fiber-to-chip mode match. In comparison with existing studies, this work achieves high coupling efficiency solely through CMOS-compatible etching without additional bottom reflectors or high-index overlays. Theoretical calculations predict a fiber-to-chip coupling efficiency of −1.76 dB and an off-chip diffraction efficiency of −1.1 dB for the TE mode. The experimental measurement of the peak coupling efficiency is −2.84 dB with the back reflection as low as −26 dB. The grating coupler paves the way for monolithic integration of Si and LN.
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