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Proceedings Paper

Two-photon microfabrication of switchable diffractive optical devices
Author(s): Stephen M. Kuebler; K. Mohanalingam; Joseph W. Perry
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Paper Abstract

Electrically switchable liquid-crystal-filled optical gratings were fabricated using two-photon three-dimensional microfabrication based on two-photon-induced polymerization (TPIP). A tightly-focused femtosecond pulsed laser beam was used to pattern polymeric grating fringes with a period of 5 μm on glass substrate coated with indium tin oxide (ITO) and a rubbed polyimide liquid-crystal alignment layer. Switchable diffractive devices were prepared by sandwiching a cyanobiphenyl nematic liquid-crystal mixture between a patterned and a blank ITO/alignment layer-coated substrate such that the liquid-crystal director was parallel to the grating fringes. Application of a voltage across the ITO electrodes rotates the director to normal to the substrate surface leading to near index matching of the liquid crystal and polymer fringes and a strong reduction in the diffraction efficiency. These switchable liquid-crystal diffractive devices exhibit a switching contrast ranging from 17 to 100 for the ± 1 diffraction orders for s-polarized light at 3 Vpp. This work demonstrates the utility of TPIP microlithography for producing active micro-optical devices.

Paper Details

Date Published: 8 October 2004
PDF: 6 pages
Proc. SPIE 5662, Fifth International Symposium on Laser Precision Microfabrication, (8 October 2004); doi: 10.1117/12.595871
Show Author Affiliations
Stephen M. Kuebler, Univ. of Arizona (United States)
K. Mohanalingam, Univ. of Arizona (United States)
Joseph W. Perry, Univ. of Arizona (United States)
Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 5662:
Fifth International Symposium on Laser Precision Microfabrication
Isamu Miyamoto; Henry Helvajian; Kazuyoshi Itoh; Kojiro F. Kobayashi; Andreas Ostendorf; Koji Sugioka, Editor(s)

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