Ultra-short and broadband polarization splitter based on PCF and metal surface plasmons resonance

摘要

An ultra-short and broadband polarization splitter based on PCF and metal surface plasmons resonance is proposed by designing a new structure and filling gold wire into certain air holes. The introducing of gold wire aims to couple with the basic modes. Then high birefringence is obtained to improve the splitter's performances including length, bandwidth and maximal extinction ratio. The numerical results demonstrate that the splitter can be the shortest length of 100m (to our knowledge) and the broad bandwidth is 470nm simultaneously. And when the splitter's length is set as 104m, the widest bandwidth reaches the maximum 575nm (to our knowledge) which covers almost all the E, S, C, L, and U communication band. In addition, the structure is relatively simple, so it is easy to fabricate using available methods. These properties will help designing splitter in the optical communication and sensing system.