Abstract
A tunable single polarizing filter is proposed by selectively coating gold film on the air holes of photonic crystal fiber (PCF). The polarization properties of the PCF filter are evaluated by the finite-element method. Simulation results show that the loss of y-polarized core mode at 1250 and 1550 nm is 136.23 and 839.73 dB/cm, respectively. Furthermore, we innovatively combine stable modulation with flexible modulation. To be specific, the resonance wavelengths are slowly controlled in a small wavelength range by altering the diameter of the air-hole-coated gold film, while the resonance wavelengths are flexibly controlled in a wide wavelength range by altering the thickness of the gold film or the diameter of the small air holes. When the length of the PCF is 500 µm, the bandwidth of extinction ratio greater than − 20 dB is only 60 nm at the communication window of 1550 nm. It is beneficial to fabricate a narrow-band polarization filter.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China under Grant 61475134 and Grant 61505175; in part by the Key Program of the Natural Science Foundation of Hebei Province, China, under Grant F2017203193 and Grant F2017203110; and in part by the Doctoral Foundation of Yanshan University under Grant B1004.
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Zhang, S., Li, J., Li, S. et al. A tunable single-polarization photonic crystal fiber filter based on surface plasmon resonance. Appl. Phys. B 124, 112 (2018). https://doi.org/10.1007/s00340-018-6988-8
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DOI: https://doi.org/10.1007/s00340-018-6988-8