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Proceedings Article

Reflective liquid crystal polarization gratings with high efficiency and small pitch

[+] Author Affiliations
Ravi K. Komanduri, Chulwoo Oh, Michael J. Escuti

North Carolina State Univ. (USA)

Proc. SPIE 7050, Liquid Crystals XII, 70500J (August 28, 2008); doi:10.1117/12.795529
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From Conference Volume 7050

  • Liquid Crystals XII
  • Iam Choon Khoo
  • San Diego, CA | August 10, 2008

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.

© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Ravi K. Komanduri ; Chulwoo Oh and Michael J. Escuti
"Reflective liquid crystal polarization gratings with high efficiency and small pitch", Proc. SPIE 7050, Liquid Crystals XII, 70500J (August 28, 2008); doi:10.1117/12.795529; http://dx.doi.org/10.1117/12.795529


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