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Appl Opt. 2011 May 20;50(15):2316-21. doi: 10.1364/AO.50.002316.

Polarization-dependent circular Dammann grating made of azo-dye-doped liquid crystals.

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1
School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore.

Abstract

A polarization-dependent circular Dammann grating (CDG) was generated from an azo-dye-doped liquid crystal (LC) cell. A simple multiexposure photo-alignment process was used to fabricate a binary phase LC CDG zone plane, which was composed of an odd zone with a twisted nematic LC structure and an even zone with a homogenous LC structure. A two-order CDG with equal-intensity rings was produced through a Fourier transform. The maximum zeroth and first diffraction orders of obtained CDG can be separately achieved by rotating the analyzer's polarization direction. The CDG using an azo-dye-doped LC cell can be used to generate diffractions by lasers in a broad wavelength range, hence expanding possible device applications.

PMID:
21614127
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