无需过渡区域高效耦合至慢光光子晶体波导：倏逝模的作用

Efficient coupling into slow light photonic crystal waveguide without transition region: role of evanescent modes.

作者信息

Martijn de Sterke C, Dossou K B, White T P, Botten L C, McPhedran R C

机构信息

CUDOS, School of Physics, University of Sydney, NSW 2006, Australia.

出版信息

Opt Express. 2009 Sep 28;17(20):17338-43. doi: 10.1364/OE.17.017338.

DOI:10.1364/OE.17.017338

PMID:19907519

Abstract

We show that efficient coupling between fast and slow photonic crystal waveguide modes is possible, provided that there exist strong evanescent modes to match the waveguide fields across the interface. Evanescent modes are required when the propagating modes have substantially different modal fields, which occurs, for example, when coupling an index-guided mode and a gap-guided mode.

摘要

我们证明，只要存在强消逝模以匹配界面两侧的波导场，快速和慢速光子晶体波导模式之间就能够实现高效耦合。当传播模式具有显著不同的模式场时，例如在耦合折射率引导模式和带隙引导模式时，就需要消逝模。