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Proceedings Paper

Reflective liquid crystal polarization gratings with high efficiency and small pitch
Author(s): Ravi K. Komanduri; Chulwoo Oh; Michael J. Escuti
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Paper Abstract

We report our experimental success in realizing high efficiency liquid crystal polarization gratings (LCPGs) on reflective substrates, with periods as small as 2.2μm, enabling the largest switchable LCPG diffraction angles reported yet for red light. Moreover, these gratings retain nearly ideal electro-optical properties, including > 95% hologram efficiency, high polarization contrast, sub-millisecond total switching times, and relatively low voltage operation (thresholds ~1.5V). We discuss two different fabrication approaches, each with its own set of advantages, which have resulted in gratings with the above compelling properties. We anticipate broad utility of these diffractive elements in a variety of applications.

Paper Details

Date Published: 27 August 2008
PDF: 10 pages
Proc. SPIE 7050, Liquid Crystals XII, 70500J (27 August 2008); doi: 10.1117/12.795529
Show Author Affiliations
Ravi K. Komanduri, North Carolina State Univ. (United States)
Chulwoo Oh, North Carolina State Univ. (United States)
Michael J. Escuti, North Carolina State Univ. (United States)

Published in SPIE Proceedings Vol. 7050:
Liquid Crystals XII
Iam Choon Khoo, Editor(s)

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