Numerical simulation of in-fiber plasmonic polarization filter using silicon hollow-core anti-resonant fiber with dual aluminum wires

Abstract

This work presents an in-fiber plasmonic polarization filter using silicon hollow-core anti-resonant fiber (HC-ARF) with dual aluminum (Al) wires. The mature finite element tool is employed to conduct optical property analysis for the proposed all-fiber filter. The simulation results show that with reasonable design of structural parameters, the central operating wavelength of this filter can be determined at the common communication window of 1.55 μm. When the Al wires are stimulated, the plasmonic mode and the y-polarized transmission mode satisfy the phase matching conditions, leading to the surface plasmon resonance (SPR) effect, a significant energy difference can be acquired in the x- and y-polarized directions at 1.55 μm. The 14 mm-long optical filter demonstrates a maximum crosstalk (CT) of 123.24 dB, and a wide bandwidth with CT greater than 20 dB of 410 nm, ranging from 1.39 μm to 1.80 μm. Furthermore, the filter shows outstanding anti-bending capacity on the central wavelength and a high quadratic fitting relationship of 0.9938 between the bending radius and the central CT intensity. Additionally, it also has high manufacture feasibility. It is reasonable to believe that this in-fiber photonic filter can exert a crucial role in optical communication, sensing detection, signal modulation, and other domains.