Cylinder and metal grating polarization beam splitter

We propose a novel and compact metal grating polarization beam splitter (PBS) based on its different reflected and transmitted orders. The metal grating exhibits a broadband high reflectivity and polarization dependence. The rigorous coupled wave analysis is used to calculate the reflectivity and the transmitting spectra and optimize the structure parameters to realize the broadband PBS. The finite-element method is used to calculate the field distribution. The characteristics of the broadband high reflectivity, transmitting and the polarization dependence are investigated including wavelength, period, refractive index and the radius of circle grating. When grating period d=400nm, incident wavelength =441nm, incident angle =60 degrees and radius of circle d/5, then the zeroth reflection order R-0=0.35 and the transmission zeroth order T-0=0.08 for TE polarization, however, T-0=0.34 and R-0=0.01 for TM mode. The simple fabrication method involves only single etch step and good compatibility with complementary metal oxide semiconductor technology. PBS designed here is particularly suited for optical communication and optical information processing.National Natural Science Foundation of China [60907003]; Foundation of NUDT [JC13-02-13]; Hunan Provincial Natural Science Foundation of China [13JJ3001]; Program for New Century Excellent Talents in University [NCET-12-0142]SCI(E)ARTICLE141404-14106