利用棱镜结构高效率地耦合出表面等离子波  

High transmission efficiency for surface plasmon wave by using of prism structure

作　　者：张锦龙[1] 刘旭[1] 李明宇[1] 厉以宇[1] 顾培夫[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,浙江杭州310027

出　　处：《光学仪器》2006年第4期31-36,共6页Optical Instruments

摘　　要：表面等离子波是指在金属和介质表面传播的电磁波,在垂直界面方向上呈指数衰减,提出了一种棱镜结构用以耦合出由K retschm ann结构产生的表面等离子波,使反射、吸收能量转化为透射光。棱镜结构在数值模拟中可以被简化为多层介质结构,利用传输矩阵方法模拟了高斯光束入射到这种结构中的传播情况,形象地得到了产生表面等离子体共振和表面等离子波耦合的结果。模拟结果显示提出的棱镜结构达到了接近70%的耦合效率,可以应用于偏振分光器件;并且利用这种结构还可观察到高斯光束分裂现象。Surface plasmon wave is an electromagnetic wave that propagates along the interface between metal and dielectric, it is exponentially decaying. It is propsed a prism structure to couple out the surface plasmon wave generated by Kretschmann device, transfer the absorption peak to transmission peak. The simulation experiment is based on transfer matrix method（TMM）and Gaussian angular spectrum decomposition. Outcoupling of surface are shown clearly by use of this simulation method, and efficiency of near 70X is obtained; this structure can also split the incident beam.

关 键 词：表面等离子体波 金属薄膜 等离子体耦合 传输矩阵法 

分 类 号：O484.4[理学—固体物理]