Tunable solid-core anti-resonant hollow fiber filter based on surface plasmon resonance

Abstract

This invention belongs to the technical field of special optical fibers and their photonic devices, and relates to a tunable solid-core anti-resonant optical fiber filter based on surface plasmon resonance. It includes a fiber core, cladding, and outer cladding arranged sequentially from the inside out. The cladding contains six cladding tubes, evenly distributed circumferentially around the center of the fiber core. Each cladding tube includes four unplated and two gold-plated tubes. The two gold-plated tubes are symmetrical about the axis of the fiber core. Both the unplated and gold-plated tubes include a tube wall with a central pore. The inner surface of the tube wall of the gold-plated tubes is coated with a gold film. This invention designs the anti-resonant optical fiber as a solid core structure, making the fiber more robust, and introduces surface plasmon resonance technology into the fiber. By coating the inner wall of the cladding tubes with a gold film to excite the surface plasmon resonance effect, a significant difference in the confinement loss of the two polarization fundamental modes in the fiber core is generated, thereby achieving a polarization filtering effect.

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