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Improved polarizer in the infrared: two wire-grid polarizers in tandem

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Abstract

A widely used polarizer in the IR is the wire-grid polarizer. Wire-grid polarizers with a typical minimal wire spacing of ∼0.25 μm perform well in the middle IR and the far IR, but in the near IR the performance deteriorates as the wavelength approaches the wire spacing. A possibility for improving this performance is to put two wire grids in tandem with their transmission axes parallel. Starting with the extended Mueller matrix description for a single wire grid, we present a mathematical treatment of this tandem polarizer showing that performance improves quadratically; e.g., a single polarizer extinction ratio of 100 increases to a tandem extinction of 10,000. The improved performance is also verified experimentally.

© 1995 Optical Society of America

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Equations (5)

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