a polarization filter based on a novel photonic crystal fiber with a gold-coated air hole by using surface plasmon resonance

A novel design of a polarization filter based on photonic crystal fiber (pcf) is proposed in this paper. with the introduction of a gold-coated air hole, the resonance strength is much stronger in y-polarized direction than in x-polarized direction at some particular wavelengths, which is due to the metal surface plasmon effects. at the wavelength of 1.31 μm, the loss of y-polarized mode is 2138.34 db/cm while the loss is very low in x polarization. furthermore, the loss peak can be flexibly adjusted from the wavelength of 1.26 to 1.56 μm by changing the thickness of a gold layer, and the loss in y polarization can be kept above 1200 db/cm. the significant loss in y polarization makes this pcf a good candidate for developing a polarization filter with high performance.