A Tunable Plasmonic Refractive Index Sensor with Nanoring-Strip Graphene Arrays. - Chunlian Cen; Hang Lin; Jing Huang; Cuiping Liang; Xifang Chen; Yongjian Tang; Zao Yi; Xin Ye; Jiangwei Liu; Yougen Yi; Shuyuan Xiao (Sensors, 2018)