Abstract
The polarization filter characters of a square lattice photonic crystal fiber with a large diameter gold-coated air hole are studied by finite element method. Results show that the resonance strength of y-pol direction is far stronger than x-pol direction. It can achieve 517 and 375 dB/cm, respectively, in y-pol direction at the communication wavelengths of 1310 and 1550 nm by adjusting structural parameters. If a second large hole is added in the opposite corner of the lattice, the resonance strength of y-pol direction can increases to 701 dB/cm at 1310 nm. At the same time, the influence for polarization filter characters is studied by changing the fiber length, the thickness of gold layer, the diameter of large air hole, and the diameters of small air holes.
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