Abstract
A high-loss broadband photonic crystal fiber polarization filter based on surface plasmon resonance is designed. The designed filter has two symmetrical large holes, and the holes are coated with a metal film, which greatly improves the loss. The characteristics of the polarization filter are calculated by the finite element method. The thickness of the metal layer and the arrangement and size of air holes near the core are discussed. The optimum structure of a metal-filled polarization filter in photonic crystal fibers is obtained. By modulating the parameters, the loss of the filter in the $y$y direction at 1.31 µm is 3261.7 dB/cm, while the loss in the $x$x direction is small. If the length of the optical fiber is set to 200 µm, the extinction ratio is greater than 20 dB, and the width is 1 µm, respectively. The filter has a simple structure and excellent performance.
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