Abstract
We present a detailed study of the electro-optic modulation in single-crystal thin films of organic materials, taking into account the effects due to multiple internal reflections and absorption of optical radiation in the crystal film and the substrate. Optical transmission expressions are derived for the widely employed field-induced birefringence measurement configuration by developing a coupled optical cavity formalism and incorporating complex electro-optic coefficient tensor elements and refractive indices in Maxwell's wave equation. This treatment is applied to the electro-optic measurements in the single-crystal films of an important and popular organic molecular salt, 4′-dimethylamino-N-methyl-4-stilbazolium tosylate. The results show that the conventional interpretation of the measured responses, where the aforesaid effects are neglected for simplicity, would lead to substantial errors in the determination of the electro-optic coefficients, which is validated by the wide variation of reported experimental results in the literature.
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