具有亚波长特征且用作偏振分束器的二元光栅设计。

Design of a Binary Grating with Subwavelength Features that Acts as a Polarizing Beam Splitter.

作者信息

Pajewski L, Borghi R, Schettini G, Frezza F, Santarsiero M

出版信息

Appl Opt. 2001 Nov 10;40(32):5898-905. doi: 10.1364/ao.40.005898.

DOI:10.1364/ao.40.005898

Abstract

A binary diffractive optical element, acting as a polarizing beam splitter, is proposed and analyzed. It behaves like a transmissive blazed grating, working on the first or the second diffraction order, depending on the polarization state of the incident radiation. The grating-phase profile required for both polarization states is obtained by means of suitably sized subwavelength groups etched in an isotropic dielectric medium. A rigorous electromagnetic analysis of the grating is presented, and numerical results concerning its performances in terms of diffraction efficiency as well as frequency and angular bandwidths are provided.

摘要

提出并分析了一种用作偏振分束器的二元衍射光学元件。它的行为类似于透射闪耀光栅，根据入射辐射的偏振态，工作在一级或二级衍射级次上。通过在各向同性介电介质中蚀刻适当尺寸的亚波长组来获得两种偏振态所需的光栅相位分布。给出了对该光栅的严格电磁分析，并提供了关于其衍射效率、频率和角带宽方面性能的数值结果。