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12 February 2010 30 to 50 ns liquid-crystal optical switches
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Proceedings Volume 7618, Emerging Liquid Crystal Technologies V; 76180J (2010)
Event: SPIE OPTO, 2010, San Francisco, California, United States
The optical switching times of liquid-crystal cells using 5CB, 5OCB and PCH5 liquid crystal materials have been characterized as a function of applied voltage, V, and temperature, T. The transition time from 90 to 10 % transmission scales as V-2 and is limited to 50 to 30 ns by the breakdown electric field, ~ 106 V cm-1 of the liquid crystal. The time from the initial voltage step to 90 % transmission, delay time, decreases with increasing voltage and approaches a constant value at higher electric fields, >105 V cm-1. Both the transition and delay times decrease with increasing temperature. The minimum transition times at temperatures a few degrees below the nematic-isotropic temperature are 32, 32, and 44 ns and delay times are 44, 25 and 8 ns for 5CB, 5OCB, and PCH5 respectively.
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M. W. Geis, R. J. Molnar, G. W. Turner, T. M. Lyszczarz, R. M. Osgood, and B. R. Kimball "30 to 50 ns liquid-crystal optical switches", Proc. SPIE 7618, Emerging Liquid Crystal Technologies V, 76180J (12 February 2010);

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