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2 Optica Applicata

2 2020

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Generation of three-port splitter by double-layer grating in second-order Littrow configuration

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

Optica Applicata

2020

Vol. 50, nr 2

271--280

In this paper, a novel double-layer three-port grating is described. The incident grating structure is in the second-order Littrow configuration. The grating region is composed of fused silica and Ta2O5.The designed grating beam splitter has high efficiency under TE polarization and TM polarization, respectively. The efficiency of two polarizations is more than 90%. In addition, compared with a single-layer three-port grating, this new beam splitter has good fabrication tolerance and incident bandwidth. Therefore, the optimized structure has a good application value.

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.