A novel photonic crystal fiber polarization filter with gold-coated air hole is proposed,and its polarization filtering characteristics are analyzed by using finite element method.The designed structure uses a rectangular gold coated air hole instead of the conventional circular air hole,and the simulation results demonstrate that this structure can enlarge the interval of the SPP resonant wavelengths of the two orthogonal modes and change their coupling efficiency,thereby reducing the confinement loss of the wanted polarization mode as low as negligible,while keeping a higher confinement loss of the unwanted polarization mode.The design is not only suitable for our fiber polarization filter,but also can be applied to other fiber filter structures.
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