Abstract
We studied the thermal optical nonlinearity in a suspension of ultra-fine absorbing particles in a nematic liquid crystal. Each particle "works" as a light-controlled "heater" of surrounding LC that results in change of the refractive index of the suspension. If the distance between absorbing particles in the suspension is less than the characteristic length of thermodiffusion, the thermal and refractive index profiles are close to those of a homogeneously absorbing medium. Therefore, thermal optical nonlinearity in suspensions of absorbing ultra-fine particles in LC can produce the same result as that in dye-doped LCs. The advantage of the proposed system is the absence of the effects, which usually accompany light-induced heating.
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