Wide-angle, broadband plate polarizer in Terahertz frequency region
- 作者：Suneet Kumar Awasthi ; Anchal Srivastava ; U. Malaviya ; S.P. Ojha
- 关键词：A. Multilayers ; A. Thin films ; D. Optical properties ; D. Polarization
- 刊名：Solid State Communications
- 出版年：2008
- 期刊代码：101_00381098
- 类别：ms
- 出版时间：June 2008
- 卷：146
- 期：11-12
- 页码：506-509
- 文件大小：520 K
摘要
In this paper, a plate polarizer for use in the terahertz (THz) frequency region (0.10 THz to 0.15 THz) has been suggested. The polarizer which is effective over a wide range of angles of the incident light (angular field =16<sup>![]()
src="http://www.sciencedirect.com/scidirimg/entities/2218.gif" alt="ring operator" title="ring operator" border="0">sup>), is composed of thin film layers of silicon and air arranged alternately to form a stack. Here we show that the polarizer has a high performance in transmission, with maximum and minimum values of the degree of polarization given by 0.9999 and 0.9963 respectively. The polarizer has some advantages over the wide angle cube polarizers investigated earlier. Firstly, in the former, the total number of thin film layers is eleven, whereas in the latter, a larger number of thin film layers are cemented between the two prisms constituting a glass cube. The fabrication of cube polarizers is therefore an expensive procedure. Secondly, prisms exhibit stress related birefringence that changes with temperature and causes problems in imaging projectors. The proposed polarizer is free from such effects.