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Design of a polarized filtering photonic-crystal fiber with gold-coated air holes

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Abstract

A novel design of a gold-coated photonic-crystal fiber (PCF) is studied by using the finite element method. The cross-section structure of the PCF is composed of a square lattice of air holes in which two air holes are gold coated, and the air-hole layout is modified. The resonance strength and the impact of structural parameters of the PCF on the polarization filter characteristics are studied. Numerical results show that the resonance strength and wavelengths are different in two polarized directions. The resonance strengths that we obtain can reach a value of 720 dB/cm at the wavelength of 1.31 μm. When the fiber length is 400 μm, the crosstalk can reach a value of 247.2 dB at the wavelength of 1.31 μm, which can be applied in many polarization filter devices. And when the length of fiber is longer than 200 μm, the crosstalk is better than 20 dB with wavelength ranges from 1.2 to 2 μm. Meanwhile, we can realize the filtering effect with a very short fiber.

© 2015 Optical Society of America

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