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Proceedings Paper

Nonlinear dye-doped liquid crystals for fast and broadband CW and long-pulse laser power control and switching
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Paper Abstract

We present a theoretical model and some experiment demonstrations of all-optical passive switching processes with 90° twist-aligned nano-doped nematic liquid crystal cells sandwiched between two crossed polarizers. The photosensitive dopants give rise to laser induced dye-assisted director axis reorientation and order parameter modifications, which in turn produce an intensity dependent polarization switching and hence a transmission modulation capability. Experimental observations are in good agreement with our expectation derived from modified Jones matrix analysis and also demonstrate the feasibility of an efficient [microwatt power] low threshold polarization and fast switching [microseconds] all optical limiting device for visible as well as infrared lasers or bright light sources.

Paper Details

Date Published: 12 September 2007
PDF: 7 pages
Proc. SPIE 6654, Liquid Crystals XI, 66540T (12 September 2007); doi: 10.1117/12.732431
Show Author Affiliations
J. D. Liou, The Pennsylvania State Univ. (United States)
J. H. Park, The Pennsylvania State Univ. (United States)
M. V. Stinger, The Pennsylvania State Univ. (United States)
A. Diaz, The Pennsylvania State Univ. (United States)
J. Huang, The Pennsylvania State Univ. (United States)
I. C. Khoo, The Pennsylvania State Univ. (United States)


Published in SPIE Proceedings Vol. 6654:
Liquid Crystals XI
Iam Choon Khoo, Editor(s)

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