Journal
OPTICS EXPRESS
Volume 18, Issue 8, Pages 8697-8704Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.008697
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This study compares optical switching capabilities of liquid crystal (LC) materials based on different classes of azobenzene dyes. LCs based on molecules containing benzene rings with nearly symmetrical pi-pi conjugation respond more efficiently to a cw beam than to a nanosecond laser pulse and maintain the changes induced by the beam for tens of hours. Using azo dye molecules containing two benzene rings with push-pull pi-pi conjugation we demonstrate high photosensitivity to both a cw beam as well as nanosecond laser pulse with only 1 s relaxation of light-induced changes in material properties. Even faster, 1 ms restoration time is obtained for azo dye molecules containing hetaryl (benzothiazole) ring with enhanced pushpull pi-pi conjugation. These materials respond most efficiently to pulsed excitation while discriminating cw radiation. 2010 Optical Society of America
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