Modulation of Kerr nonlinearity on spectral characteristics for one-dimensional nonlinear defective photonic crystals

Nonlinear reflectance spectra of one-dimensional photonic crystals with a Kerr defect layer are numerically studied in this paper. The laser intensity-dependent nonlinearity will cause the bending of the reflectance spectrum and the moving of the defect mode's location in a certain direction according to the sign of χ(3). The influence of incident intensity, polarization, and incident angle on the nonlinear reflectance spectra are discussed in detail. The reflectance spectra will show bistable characteristic when the incident intensity is larger than the threshold value. The possible application of the spectral characteristic in switchable filtering is discussed as well. These results will provide a valuable reference for the design and application of new filtering and switching devices.