Azzam R M A
Department of Electrical Engineering, University of New Orleans, New Orleans, Louisiana 70148, USA.
Appl Opt. 2011 Jul 1;50(19):3316-20. doi: 10.1364/AO.50.003316.
An analytically tractable design procedure is presented for a polarizing beam splitter (PBS) that uses frustrated total internal reflection and optical tunneling by a symmetric LHL trilayer thin-film stack embedded in a high-index prism. Considerable simplification arises when the refractive index of the high-index center layer H matches the refractive index of the prism and its thickness is quarter-wave. This leads to a cube design in which zero reflection for the p polarization is achieved at a 45° angle of incidence independent of the thicknesses of the identical symmetric low-index tunnel layers L and L. Arbitrarily high reflectance for the s polarization is obtained at subwavelength thicknesses of the tunnel layers. This is illustrated by an IR Si-cube PBS that uses an embedded ZnS-Si-ZnS trilayer stack.
本文提出了一种用于偏振分束器（PBS）的易于分析的设计方法，该偏振分束器利用了高折射率棱镜中嵌入的对称LHL三层薄膜堆栈的受挫全内反射和光学隧穿效应。当高折射率中心层H的折射率与棱镜的折射率匹配且其厚度为四分之一波长时，可实现相当大的简化。这导致了一种立方体设计，其中p偏振在45°入射角下实现零反射，且与相同对称低折射率隧穿层L和L的厚度无关。在隧穿层的亚波长厚度下可获得任意高的s偏振反射率。通过使用嵌入式ZnS-Si-ZnS三层堆栈的红外硅立方体PBS进行了说明。
