Journal
OPTICS LETTERS
Volume 33, Issue 20, Pages 2287-2289Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.33.002287
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- National Science Foundation (NSF) [ECCS-0621906]
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We demonstrate a broadband, thin-film, polarizing beam splitter based on an anisotropic diffraction grating composed of reactive mesogens (polymerizable liquid crystals). This achromatic polarization grating (PG) manifests high diffraction efficiency (similar to 100%) and high extinction ratio (>= 1000:1) in both theory and experiment. We show an operational bandwidth Delta lambda/lambda(0)similar to 56% (roughly spanning visible wavelength range) that represents more than a fourfold increase of bandwidth over conventional PGs (and significantly larger than any other grating). The diffraction angle and operational region (visible, near-infrared, midwave infrared, and ultraviolet wavelengths) may be easily tailored during fabrication. The essence of the achromatic design is a stack of two chiral PGs with an opposite twist sense and employs the principle of retardation compensation. We fully characterize its optical properties and derive the theoretical diffraction behavior. (C) 2008 Optical Society of America
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