提出了一种基于金线填充的双芯光子晶体光纤超短偏振分束器, 并进行了有限元分析.金线表面激发的表面等离子激元与双芯光子晶体光纤纤芯模之间的强烈耦合, 导致更短的偏振分束器长度和更大的工作带宽.与同类的偏振分束器相比, 所提出的偏振分束器能同时实现较短的长度和较高的消光比.数值结果表明, 长度为 0.263 mm 的偏振分束器, 在波长 1.55 μm 处消光比达 -70 dB, -20 dB 消光比带宽为 124 nm.

An ultra-short polarization splitter based on dual-core Photonic Crystal Fiber (PCF) with a gold wire filled into the air hole between the two cores has been proposed and analyzed with the finite element method. Surface Plasmon Polaritons (SPPs) excited on the surface of gold wire have strong resonant coupling with the guided core modes of PCF, which enables a short polarization-splitting length and broadband operation. Compared to its counterparts, the proposed polarization splitter exhibits a shorter length and higher Extinction Ratio (ER), simultaneously. Numerical results indicate that the 0.263 mm long polarization splitter can achieve an ER of -70 dB at the wavelength of 1.55 μm with -20 dB-ER bandwidth of 124 nm.