Abstract

Giant enhancement of optical reorientation in pure nematic liquid crystals (LCs) was observed with a near-resonant input beam. The enhancement observed through reduction of the threshold of the optical Fréedericksz transition in a 28-$\mu \mathrm{m}$-thick homeotropic LC cell was almost 700 times in comparison with the case of an off-resonant input beam. Wavelength dependence of the enhancement followed the LC absorption spectrum very well, confirming that the enhancement arose from the excitation of LC molecules.

© 2009 Optical Society of America

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