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Low-index cladded wire grating as broadband polarizing beam splitter

机译:低折射率包层线栅作为宽带偏振分束器

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A sandwich structure including subwavelength grating and low-index thin film as a broadband polarizing beam splitter(BPBS) is demonstrated. The BPBS is studied by using the rigorous coupled-wave analysis (RCWA) numerical scheme.The low-index thin-film with optimum thickness forms between the silicon substrate and the subwavelength grating.While the thickness of low-index thin film is larger than 0.6 m, the reflectivity of TE wave is larger than 0.95 in thewavelength region [1.29 m, 1.66 m] under the normal incidence. In this region, the reflectivity of TM wave is low.Meanwhile, it is also found that while the thickness of low-index thin film rise to 0.9 m, the extinction ratio of TMpolarization is less than 0.047 in the wavelength region [1.35 m, 1.48 m]. Therefore, the designed sandwich structureconsisted of subwavelength grating, low-index thin film and silicon substrate can be used as broadband polarizing beamsplitter.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
机译:对包含亚波长光栅和低折射率薄膜作为宽带偏振分束器(BPBS)的三明治结构进行了说明。通过严格的耦合波分析(RCWA)数值方案研究BPBS,在硅基板和亚波长光栅之间形成具有最佳厚度的低折射率薄膜,而低折射率薄膜的厚度大于在垂直入射的情况下,波长为0.6μm的TE波在波长区域[1.29μm,1.66μm]的反射率大于0.95。在该区域,TM波的反射率较低。同时,还发现,虽然低折射率薄膜的厚度增加到0.9m,但在波长区域[1.35],TM偏振的消光比小于0.047。 m,1.48m]。因此,由亚波长光栅,低折射率薄膜和硅衬底组成的设计三明治结构可以用作宽带偏振分束器。©(2012)COPYRIGHT光电仪器工程师协会(SPIE)。摘要的下载仅允许个人使用。

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