光电子快报(英文版), 2015, 11 (5): 338, Published Online: Oct. 12, 2017  

Tunable thin-film filter with low angle sensitivity

Author Affiliations
Department of Information Science and Technology, Wenhua College, Huazhong University of Science and Technology,Wuhan 430074, China
Abstract
Conventional angle-tuned thin-film filters have serious angle sensitivity for their low spacer effective refractive index, and it is difficult to fabricate their angle control system. In this paper, we propose and fabricate a novel 100 GHz angletuned thin-film filter stack with low angle sensitivity, which uses the high refractive index material TiO22 as the spacer, and its incident angle can be expanded to 25°. Compared with the traditional Ta2O5-SiO2 thin-film filter stack, the novel stack has fewer layers. Using the polarization beam splitters and the half wave plates, the polarization sensitivity of the angle-tuned filter can also be suppressed. Simulation results and the experiments show that the thin-film filter with low angle sensitivity has an effective tuning range of 33 nm, which can cover the whole C-band, and its angle control system is easy to be fabricated.

YU Kan, BAO Jia-qi, YIN Juan-juan. Tunable thin-film filter with low angle sensitivity[J]. 光电子快报(英文版), 2015, 11(5): 338.

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