Ultra-short plasmonic polarization beam splitter-rotator using a bent directional coupler  

作　　者：Bing Bai Li Pei Jingjing Zheng Tigang Ning Jing Li 白冰;裴丽;郑晶晶;宁提纲;李晶(Key Laboratory of All Optical Network and Advanced Telecommunication Network,Ministry of Education,Institute of Lightwave Technology,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]Key Laboratory of All Optical Network and Advanced Telecommunication Network,Ministry of Education,Institute of Lightwave Technology,Beijing Jiaotong University,Beijing 100044,China

出　　处：《Chinese Optics Letters》2020年第4期12-16,共5页中国光学快报（英文版）

基　　金：partially supported by the National Natural Science Foundation of China(NSFC)(Nos.61827817 and 61525501)。

摘　　要：We propose and analyze a silicon hybrid plasmonic polarization splitter-rotator with an ultra-short footprint using an asymmetric bent directional coupler on a silicon-on-insulator platform.Benefitting from the large birefringence induced by the bent structure and plasmonic effect,the cross-polarization coupling length is only 5.21μm.The transverse magnetic to transverse electric polarization conversion efficiency is over 99.9%,with an extinction ratio of 20.6 dB(32.5 dB)for the transverse magnetic(transverse electric)mode at 1.55μm.Furthermore,the polarization conversion efficiency is higher than 90%while maintaining cross talk below-19 dB within the bandwidth of 80 nm.

关 键 词：polarization sensitive devices surface plasmons integrated optics devices 

分 类 号：TN622[电子电信—电路与系统] O53[理学—等离子体物理]