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Opt Express. 2006 Mar 20;14(6):2236-41.

Colossal optical nonlinearity induced by a low frequency external electric field in dye-doped liquid crystals.


We report on the effects of a low-frequency electric field on the optical nonlinear response of thin dye-doped liquid crystal cells. Experimental data show that the external field allows reaching extremely high values of the optical nonlinearity without any critical control of the cell interfaces. A qualitative interpretation of the collected data, based on the light-induced modulation of the bulk voltage through surface modifications, is proposed.


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