High-efficiency grating-couplers: demonstration of a new design strategy.

High-efficiency grating-couplers: demonstration of a new design strategy.
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DOI:
10.1038/s41598-017-16505-z
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发表时间:
2017-11-30
期刊:
影响因子:
4.6
通讯作者:
Minzioni P
Minzioni P
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Marchetti R;Lacava C;Khokhar A;Chen X;Cristiani I;Richardson DJ;Reed GT;Petropoulos P;Minzioni P

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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.
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