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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 angletuned 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.
Keywords
Oblique Incidence
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Polarization Beam Splitter
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Half Wave Plate
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Refractive Index Material
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Measured Transmittance Spectrum
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Kan Yu, Jia-qi Bao, Juan-juan Yin.
Tunable thin-film filter with low angle sensitivity.
Optoelectronics Letters 338-341 DOI:10.1007/s11801-015-5126-7
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