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Appl Opt. 2012 Jul 10;51(20):4852-7. doi: 10.1364/AO.51.004852.

Efficient and monolithic polarization conversion system based on a polarization grating.

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  • 1Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA.

Abstract

We introduce a new polarization conversion system (PCS) based on a liquid-crystal polarization grating (PG) and louvered wave plate. A simple arrangement of these elements laminated between two microlens arrays results in a compact and monolithic element, with the ability to nearly completely convert unpolarized input into linearly polarized output across most of the visible bandwidth. In our first prototypes, this PG-PCS approach manifests nearly 90% conversion efficiency of unpolarized to polarized for ±11° input light divergence, leading to an energy efficient picoprojector that presents high efficacy (12 lm/W) with good color uniformity.

PMID:
22781264
[PubMed]
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