Numerical Simulation of Surface Plasmon Resonance Polarization Filter Using Hollow Core Anti-Resonance Fiber with Dual Graphene-Coated Aluminum Wires

The work demonstrates a plasmonic polarization filter using dual graphene-coated aluminum (Al) wires embedded hollow core fiber (HCF). The finite element method (FEM) is employed to analyze the in-fiber transmission characteristics. The simulation results show when the outer tube diameter d₁ is 13.6 μm, inner diameter tube d₂ is 8.0 μm, the Al wire diameter d₃ is 3.4 μm, tube-to-tube pitch Ʌ is 16.1 μm, outer tube thickness t₁ is 0.48 μm, inner tube thickness t₂ is 0.52 μm and graphene layer thickness t_g is 1 nm, this in-fiber filter can operate around central wavelength of 1.55 μm, where the loss difference between the two polarization directions can reach 661 times. The 10-mm-long filter exhibits a maximum extinction ratio (ER) of − 53.471 dB, and an operating bandwidth with ER <  − 20 dB of 230 nm, spanning from 1.48 to 1.71 μm. Additionally, an extremely strong anti-bending capability and a good cubic polynomial relationship with R² = 0.9532 between bend radius and ER intensity can be achieved. Finally, the fabrication feasibility and tolerance are discussed. It is believed that the proposed filter possesses excellent extinction capabilities, broad bandwidth, compact dimensions, resistance to bending, and repeatability, addressing the requirements of contemporary photonic integrated systems, overcoming the “electronic bottleneck” challenge.