Queer behaviors of multiple interface states in nonlinear photonic crystal heterostructure

Center for Theoretical Physics, Department of Physics, Capital Normal University - Beijing, 100048, China

^(a) zlm-phy@cnu.edu.cn (corresponding author)

Received: 7 July 2019
Accepted: 3 October 2019

Abstract

Multiple interface states can be generated in one-dimensional photonic crystal heterostructure containing nonlinear material assisted by the Dirac Point. We present the queer behaviors of the multiple interface modes and it is found that these interface modes can be well described by a simple function. By adjusting the temperature of the system, the corresponding interface modes can be adjusted, however, we found that the same function can also be used to describe the energy levels of the interface modes for different temperatures, and we further reveal the meaning of relevant parameters. As applications, we calculate the second harmonic generation (SHG) under this system and it is easy for this system to make both the fundamental wave and second-harmonic wave simultaneously as the interface modes which have a strong localized field distribution at the interfaces. It is found that the tunable multiple wavelength SHG conversion efficiencies are more than 10000 times higher than that of quasi-phase-matching optical superlattice. We believe that these findings can be used to provide direct guidance for practical application.