Designs of infrared non-polarizing beam splitters

zyp

Designs of infrared non-polarizing beam splitters$
Zheng Ping Wang
, Jin Hui Shi, Shun Ling Ruan
Science School, Harbin Engineering University, 2 Yiman Street Nangang District, Harbin 150001, China
Received 21 February 2005; received in revised form 16 June 2005; accepted 17 June 2005
. t, N8 j) n# cAvailable online 27 July 2005
Abstract
5 u3 a5 r2 F/ j6 L- tWhen used at oblique angles of incidence, the reflectance and transmittance of thin films exhibit strong polarization effects
3 y# C) s, f% g8 g; c4 H0 H  Y(PEs), particularly for the films inside a glass cube, which result from the fact that the tangential components of the electric
and magnetic fields are continuous across each layer interface. However, for many applications, the PEs are undesirable and
should be reduced. Therefore, the concept of non-polarizing beam splitter (NPBS) is proposed. Up till now, however, most
of the reports of NPBSs are suitable for visible light. Therefore, it is necessary to find out some methods to reduce the PEs
for infrared applications. A design method of the infrared NPBS in a cube is proposed, the theoretical analysis is given,
% [( B% m, K$ A- o  adesigns for different substrates are demonstrated and the simulations of their optical properties are presented in this
paper.
r 2005 Elsevier Ltd. All rights reserved.
Keywords: Polarization; Non-polarizing beam splitter; Optical thin film; Reflection-induced retardance