Optimization design of polarizing beam splitter based on metal-multilayer high-contrast reflecting grating

A reflecting polarizing beam splitter (RPBS) with structure of metal-multilayer high-contrast grating (MMHG) is designed using a genetic algorithm and the Fourier mode method. The proposed RPBS grating can work at a central wavelength of 1053 nm, and reflect the transverse electric (TE) wave in the -1st order and the transverse magnetic (TM) wave in the 0th order. The optimized RPBS grating has high extinction ratios over 20dB from 1030nm to 1076nm and at angle range from 48.6° to 55.1°. The highest efficiency over 98% and polarization extinction ratios of the 0th order and -1st order with 62.2 dB and 48.8 dB at 1053 nm is obtained, respectively. In addition, the optimized MMHG structure shows acceptable tolerances for grating fabrication. This kind of MMHG may be a potential candidate for the RPBS used in different optical systems.

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