Ultracompact tapers for light coupling into two-dimensional slab photonic-crystal waveguides in the slow light regime

被引：9

作者：

Marris-Morini, Delphine ^{[1
]}

Cassan, Eric ^{[1
]}

Bernier, Damien ^{[1
]}

Maire, Guillaume ^{[1
]}

Vivien, Laurent ^{[1
]}

机构：

[1] Univ Paris 11, CNRS, UMR 8622, Inst Elect Fondamentale, Bat 220, F-91405 Orsay, France

来源：

OPTICAL ENGINEERING | 2008年 / 47卷 / 01期

关键词：

integrated optics; photonic crystal; slow wave; silicon;

D O I：

10.1117/1.2831132

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Optical coupling from a strip waveguide to a two-dimensional photonic crystal (PC) slab waveguide in the slow light regime is investigated. Group-velocity mismatch between optical modes is responsible for large coupling loss. Typical devices based on a W1 PC waveguide, with strip input and output waveguides on each side, are studied using finite-difference time-domain and plane-wave expansion calculations. Compact tapers based on PC lattice parameter tuning are proposed to reduce the coupling loss. At 1.6 mu m, for an optical mode with group velocity v(g)/c=0.054, the transmission can be enhanced from 18% without tapers to 95% with a 3.4-mu m-long taper on each side of the PC. (C) 2008 Society of Photo-Optical Instrumentation Engineers.

引用

页数：6

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