Vol. 50, Issue 4, pp. 609-618

Vol. 50 Issue 4 pp. 609-618

Diffraction mechanism of five-port transmission gratings

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


1 × 5 splitting, single-groove grating, normal incidence


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.

Vol. 50
Issue 4
Article No: 08
pp. 609-618

1.45 MB
OPTICA APPLICATA - a quarterly of the Wrocław University of Science and Technology, Faculty of Fundamental Problems of Technology