Abstract
Liquid crystals have effective nonlinear optical coefficients that are orders of magnitude larger than other materials exploited in integrated optics. The addition of some organic dyes in small amounts may further enhance the nonlinear optical response and even change its sign. We used a dye-nematic liquid crystal mixture exhibiting a negative optical nonlinearity. We observed the nonlinear spatial splitting of the guided modes in a symmetric planar waveguide whose core was the liquid crystal mixture. This non-linear effect has been observed with very low laser power input and the power threshold dependence on dye concentration and core thickness was investigated.
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