Newly Reflective Bi-Function Beam Splitter By Sio2 Pencil-Like Arrays On Silver Plate

An enhanced newly high-efficiency dual-function beam splitter of the grating is described in this paper. The proposed grating can realize newly dual-function at infrared wavelength under second Bragg incidence, which can function as high-efficiency component for TE polarization. Moreover, under TM polarization, the grating is different from the other traditional dual-function grating, which can achieve a three-port output with high efficiency and good uniformity. By using the finite element method, an optimum grating structure can be presented with the efficiency of three diffraction orders (0th, -1st, -2nd) for TM polarization greater than 30%. As for TE polarization, the efficiency of -2nd order will be better than 95% with a wide bandwidth. Therefore, the proposed grating can be well applied in variety optical fields.