Yu Ching-Wei, Jen Yi-Jun
Department of Electro-Optical Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao E. Rd., Taipei 106, Taiwan.
Opt Express. 2010 Apr 12;18(8):7982-93. doi: 10.1364/OE.18.007982.
The mechanism and design of p- and s- polarized ultra-long-range surface-plasmon-polariton (SPP) propagation in the configuration {prism/ equivalent coupling layer (ECL)/ silver film (20 nm)/ equivalent substrate (ES)} are investigated using a normalized admittance diagram (NAD). The excitation of ultra-long-range SPP waves is characterized as a huge open loop of the NAD of the metal film at a designated angle of incidence. We propose three kinds of ECLs to complete the multilayer ultra-long-range SPP design: the normalized admittance of the ECL is (i) real (ii) infinite (iii) imaginary. The ultra-long propagation lengths in the three designs are compared at a wavelength of 632.8 nm for p- and s-polarization states.
利用归一化导纳图（NAD）研究了在{棱镜/等效耦合层（ECL）/银膜（20纳米）/等效衬底（ES）}结构中p偏振和s偏振超远程表面等离子体激元（SPP）传播的机制和设计。超远程SPP波的激发表现为在指定入射角下金属膜NAD的一个巨大开环。我们提出了三种类型的ECL来完成多层超远程SPP设计：ECL的归一化导纳为（i）实值（ii）无穷大（iii）虚值。在632.8纳米波长下，对p偏振和s偏振状态的三种设计中的超传播长度进行了比较。
