Tunable thin-film filter with low angle sensitivity
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Department of Information Science and Technology, Wenhua College, Huazhong University of Science and Technology, Wuhan 430074, China

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    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 angle-tuned thin-film filter stack with low angle sensitivity, which uses the high refractive index material TiO2 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.

    Reference
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YU Kan, BAO Jia-qi, and YIN Juan-juan;. Tunable thin-film filter with low angle sensitivity[J]. Optoelectronics Letters,2015,11(5):338-341

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History
  • Received:July 04,2015
  • Online: November 26,2015
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