来自光子晶体波导的定向自由空间耦合。

Directional free-space coupling from photonic crystal waveguides.

作者信息

Tsai Cheng-Chia, Mower Jacob, Englund Dirk

机构信息

Department of Electrical Engineering, Columbia University, New York, NY 10027, USA.

出版信息

Opt Express. 2011 Oct 10;19(21):20586-96. doi: 10.1364/OE.19.020586.

DOI:10.1364/OE.19.020586

PMID:21997066

Abstract

We present a general approach for coupling a specific mode in a planar photonic crystal (PC) waveguide to a desired free-space mode. We apply this approach to a W1 PC waveguide by introducing small index perturbations to selectively couple a particular transverse mode to an approximately Gaussian, slowly diverging free space mode. This "perturbative photonic crystal waveguide coupler" (PPCWC) enables efficient interconversion between selectable propagating photonic crystal and free space modes with minimal design perturbations.

摘要

我们提出了一种将平面光子晶体（PC）波导中的特定模式与所需自由空间模式耦合的通用方法。通过引入小的折射率微扰，将这种方法应用于W1 PC波导，以选择性地将特定横向模式耦合到近似高斯、发散缓慢的自由空间模式。这种“微扰光子晶体波导耦合器”（PPCWC）能够在可选择的传播光子晶体模式和自由空间模式之间实现高效的相互转换，且设计微扰最小。