Electro-optic modulation at 1.5 GHz using single-crystal film of an organic molecular salt

Electro-optic modulation using single-crystal film of an organic molecular salt with light propagating perpendicular to the film (transverse configuration) has been recently reported. In this letter, we report results of measurements at high speed (up to 1.5 GHz) using such films in the same configuration. Excellent signal-to-noise ratio has been observed even at a low applied voltage (1 V across 15 mum gap) for a 3 mum thick film. The magnitudes of the electro-optic coefficients are: r(11)=445 pm/V and r(21)=148 pm/V at 750 nm. A wide range of applications of these films are predicted. (C) 2002 American Institute of Physics.