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Self-activated liquid-crystal cells with photovoltaic substrates

Jennifer L. Carns, Gary Cook, Mohammad A. Saleh, Svetlana V. Serak, Nelson V. Tabiryan, and Dean R. Evans

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Abstract

We show that photovoltaic fields are capable of efficiently reorienting liquid crystals, leading to new concepts of optically addressable light modulators. Using an arrangement consisting of a liquid-crystal layer between LiNbO3:Fe photovoltaic substrates, we observed spatial filtering due to self-phase modulation in a planar-oriented cell and nonlinear transmission between crossed polarizers in a twist-oriented cell. These processes do not require an external electric field. The substrates are arranged such that light propagates along the +c axis in each substrate, allowing a secondary process of power transfer to occur through contradirectional photorefractive two-beam coupling.

© 2006 Optical Society of America

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