Depth-minimized, large period half-wave corrugation for linear to radial and azimuthal polarization transformation by grating-mode phase management

Abstract : The transformation of the polarization distribution of a laser beam from linear to radial and azimuthal by means of a subwavelength binary corrugation etched in a high-index substrate faces fabrication difficulties and an inherent contradiction preventing the achievement of both conditions of 100% transmission and of π phase difference between polarization components. The contradiction is solved by resorting to an easily fabricable high-index corrugation on a low-index substrate where a larger period gives rise to grating-mode reflection/transmission phases that permit the fulfillment of both conditions with a depth-minimized corrugation. From the principle of the solution, a targeted numerical search gives the complete set of the corresponding shallow structures, achieving polarization rotation in a fitting analytical form versus normalized variables.
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Submitted on : Friday, October 7, 2011 - 8:54:24 AM
Last modification on : Wednesday, July 25, 2018 - 2:05:30 PM

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Thomas Kampfe, O. Parriaux. Depth-minimized, large period half-wave corrugation for linear to radial and azimuthal polarization transformation by grating-mode phase management. Journal of the Optical Society of America. A Optics, Image Science, and Vision, Optical Society of America, 2011, 28 (11), pp.2235-2242. ⟨ujm-00630030⟩

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