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All-optical image processing by means of a photosensitive nonlinear liquid-crystal film: edge enhancement and image addition–subtraction

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Abstract

We demonstrate two simple yet efficient all-optical image-processing techniques that use nonlinear photosensitive dye-doped nematic liquid-crystal films, namely, edge enhancement and image addition–subtraction operations. These films require no external bias and function at much lower optical powers and shorter response times than other conventional methods.

© 2001 Optical Society of America

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