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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.