Electro-optic modulation using an organic single crystal film in a Fabry–Perot cavity

Electro-optic modulation has been demonstrated using single crystal film of an organic electro-optic material, [N-(4-nitrophenyl)-L-prolinol] (NPP), placed in a Fabry–Perot cavity. The transverse geometry was used for electro-optic modulation. The cavity used had a finesse of about 50. The modulation depth achieved was about 0.7% for a low ac field of 0.5 V/μm applied along the charge-transfer (polar) axis on the film. The results are promising for applications of such films in high speed optical signal processing.