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Broadband IR polarizing beam splitter using a subwavelength-structured one-dimensional photonic-crystal layer embedded in a high-index prism

机译:使用嵌入高折射率棱镜中的亚波长结构一维光子晶体层的宽带红外偏振分束器

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摘要

An iterative procedure for the design of a polarizing beam splitter (PBS) that uses a form-birefringent, subwavelength-structured, one-dimensional photonic-crystal layer (SWS 1-D PCL) embedded in a high-index cubical prism is presented. The PBS is based on index matching and total transmission for the p polarization and total internal reflection for the s polarization at the prism-PCL interface at 45 deg angle of incidence. A high extinction ratio in reflection (>50 dB) over the 4-12 (mu)m IR spectral range is achieved using a SWS 1-D PCL of ZnTe embedded in a ZnS cube within an external field of view of +-6.6 deg and in the presence of grating filling factor errors of up to +-10percent. Comparable results, but with wider field of view, are also obtained with a Ge PCL embedded in a Si prism.
机译:提出了一种设计偏振分束器(PBS)的迭代过程,该偏振分束器使用嵌入高折射率立方棱镜中的形式双折射,亚波长结构的一维光子晶体层(SWS 1-D PCL)。 PBS基于入射角为45度的棱镜-PCL界面的p偏振的折射率匹配和全透射以及s偏振的全内反射。使用嵌入在ZnS立方体中的ZnTe的SWS 1-D PCL在+ -6.6度的外部视场中,在4-12μm红外光谱范围内实现了高消光比(> 50 dB)并且在光栅填充因子误差高达+ -10%的情况下。使用嵌入在Si棱镜中的Ge PCL也可以获得可比较的结果,但具有更广阔的视野。

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