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Diffraction mechanism of five-port transmission gratings

Gao Chenhao, Wang Bo, Wen Kunhua, Meng Ziming, Wang Qu, Nie Zhaogang, Xing Xiangjun, Chen Li, Lei Liang, Zhou Jinyun

Optica Applicata

2020

Vol. 50, nr 4

609--618

This paper designs a five-port transmission grating under normal incidence. Rigorous coupled-wave approach is used to optimize the grating parameters. The energy of the grating is mainly dispersed to the 0th, ±1st and ±2nd orders. The efficiency of each diffraction order under both polarizations is close to 20%. The modal method is used to describe the propagation mechanism of the two polarized lights in the grating, and the diffraction behavior of the grating is analyzed. In addition, the grating has a wide range of incident characteristics and a large process tolerance. Therefore, this five-port beam splitter with a connecting layer will be a good polarization-independent beam splitting device.