Broadband single-polarization photonic crystal fiber based on surface plasmon resonance effect

We numerically demonstrate a broadband single polarization Photonic Crystal Fiber (PCF) based on surface plasmon resonance effect. The PCF is constructed of multi-layer hexagonal air holes with a silicon core. The inner wall of the two large air holes is coated with gold films for exciting surface plasmon resonances. The transmission characteristics of the fiber are analyzed by the finite-element method. At the wavelength point of 1.55 μm, the confinement losses of the x and y-polarization modes are 1400 dB/m and 15 dB/m, respectively. The severe difference in polarization loss can support the efficient transmission of the y-polarization mode over the range of 1.51-2.24 μm. Only short fiber lengths of 2 cm, the achievable power of the y-polarization mode can be more than 0.5, and the extinction ratio is less than -20dB for the wavelength range. The presented fiber has promising application prospects in polarization-maintaining and high-power laser systems.