18 April 2016 A subwavelength Stokes polarimeter on a silicon chip
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Abstract
Measuring the state of polarization (SoP) of light beams is of paramount importance in many scientific and technological disciplines, including chemistry, biosensing, astronomy and optical communications. Commercial polarimeters are built by using bulky and expensive optical elements, including half-wave plates or grid polarizers, with little prospect for miniaturization. Inspired by the concept of spin-orbit coupling, here we introduce a nanophotonic polarimeter that measures the full SoP – Stokes parameters – of a light beam over an ultrabroad wavelength range. The active region of the device, formed by a metallic nanoantenna on top of a silicon waveguide crossing, is less than a square wavelength, one order of magnitude smaller than polarimeters based on metasurfaces and many orders of magnitude smaller than commercial devices. Our approach is universal and therefore applicable to any wavelength regime and technological platform, opening a new route for miniaturized polarimeters.
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A. Espinosa Soria, Francisco J. Rodríguez-Fortuño, Amadeu Griol, Alejandro Martínez, "A subwavelength Stokes polarimeter on a silicon chip", Proc. SPIE 9884, Nanophotonics VI, 98841I (18 April 2016); doi: 10.1117/12.2227634; https://doi.org/10.1117/12.2227634
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