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

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Abstract

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° angle of incidence. A high extinction ratio in reflection (>50dB) over the 412μm 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 and in the presence of grating filling factor errors of up to ±10%. Comparable results, but with wider field of view, are also obtained with a Ge PCL embedded in a Si prism.

© 2009 Optical Society of America

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