Electro-optic properties of one-dimensional (1D) nonlinear perfect photonic crystals based on Lithium tantalate layer

Electro-optic properties of one-dimensional (1D) nonlinear perfect photonic crystals (PCs) based on Lithium tantalate (LiTaO3) layer and air were studied. Using transfer matrix method, we found that the resonance transmission peak induced by weak defocusing Kerr nonlinearity can be tuned to any wavelength when the 1D structure is subject to external electric field. We demonstrated numerically that the intensity of this localized mode either increases or decreases depending on both the magnitude and the direction of the applied electric field. In addition, the wavelength varies linearly with the applied external electrical field and depends on the incidence angle. For a critical nonlinearity strength |αc|, the single resonance peak splits into two resonances as the magnitude of the external electric field is increased. Moreover, the number of transmission resonance peaks with narrow FWHM, high Q factor and total transmission can be enhanced by increasing the intensity of the applied electric field. Results presented in the current study promote the application of our one-dimensional (1D) nonlinear perfect photonic crystal for electrically tunable narrow-band transmission multi-channel optical filters and some other optoelectronic applications.