文章基本信息

标题：High-efficiency grating-couplers: demonstration of a new design strategy
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作者：Riccardo Marchetti ; Cosimo Lacava ; Ali Khokhar 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2017
卷号：7
期号：1
页码：16670
DOI：10.1038/s41598-017-16505-z
语种：English
出版社：Springer Nature
摘要：We present a simple and practical strategy that allows to design high-efficiency grating couplers. The technique is based on the simultaneous apodization of two structural parameters: the grating period and the fill-factor, along with the optimization of the grating coupler etching depth. Considering a 260 nm Si-thick Silicon-on-insulator platform, we numerically demonstrated a coupling efficiency of -0.8 dB (83%), well matching the experimental value of -0.9 dB (81%). Thanks to the optimized design, these results represent the best performance ever reported in the literature for SOI structures without the use of any back-reflector.