Enhanced electro-optic modulation of LiNbO3-based photonic crystal cavitieswith dual mode and polarization operation

Abstract

A high output transmission and high quality factor, compact LiNbO3-based Fabry{Perot-type photoniccrystal cavity is reported that can be used in electro-optical modulators at optical communication wavelengths. Theelectro-optic effect is 123 times enhanced as compared to the bulk material as a result of the slow light effect. Thetransmission wavelength is found to depend linearly on the applied voltage with 1.2 nm/V modulation sensitivity.Moreover, an externally switchable dual mode regime with high quality factors and transmissions is realized. Hightransmissions and high quality factors are also obtained for both transverse-electric and transverse-magnetic polarizationssimultaneously.