基于等离子体的硅基绝缘体波导超紧凑偏振分束器。

Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou, China.

Sci Rep. 2013;3:2206. doi: 10.1038/srep02206.

An ultracompact polarization beam splitter (PBS) is designed on silicon-on-insulator (SOI) platform based on the localized surface plasmons (LSPs) excited by particular polarization light. The device uses nanoscale silver cylinders as the polarization selection between two silicon waveguides of a directional coupler. The transverse-magnetic (TM) polarization light excites localized surface plasmons and is coupled into the cross port of the directional coupler with a low insert loss, while the transverse-electric (TE) polarization light is under restriction. The PBS has a coupling layer with 50 nm width and 1.1 μm length supporting broadband operation. The simulation calculations show that 22.06dB and 23.06dB of extinction ratios for the TE and TM polarizations were obtained, together with insertion losses of 0.09dB and 0.40dB.

一种超紧凑的偏振分光器（PBS）基于特定偏振光激发的局域表面等离激元（LSPs），在绝缘体上硅（SOI）平台上设计而成。该器件采用纳米尺度的银圆柱作为定向耦合器两个硅波导之间的偏振选择。横磁（TM）偏振光激发局域表面等离激元，并以低插入损耗耦合到定向耦合器的交叉端口，而横电（TE）偏振光则受到限制。该 PBS 具有 50nm 宽、1.1μm 长的耦合层，支持宽带操作。模拟计算表明，TE 和 TM 偏振的消光比分别达到 22.06dB 和 23.06dB，插入损耗分别为 0.09dB 和 0.40dB。