Diffraction characteristics of polarizing beam splitters based on subwavelength dielectric grating

A novel approach to the design of the polarizing beam splitters based on the subwavelength dielectric grating is presented. Using rigorous coupled-wave theory and matrix LU decomposition, the Rayleigh anomaly and the effects of the grave depth, the duty cycle, the incident angle and the incident wavelength on the diffraction efficiency were investigated. The results show that at the incident wave length of 1 550 nm, the grating period of l0/2, the Rayleigh incident angle of 30°, the grave depth of 0.9l0 and the duty cycle of 0.5, using Rayleigh anomaly the TE polarization and TM polarization diffraction efficiency of 0-order reached nearly 100% at the same time.