Analysis of Plasmon Resonance in a Multilayer-coated Bigrating
Periodically corrugated thin metal films have an interesting property such as the partial or total resonance absorption of incident light energy. The resonance absorption is associated with the excitation of the surface plasmons and is then termed the resonance absorption. Most of studies on the resonance absorption have mainly dealt with a thin metal film grating whose surfaces are periodic in one direction. We investigate the plasmon resonance of a multilayer coated bigrating which consists of thin-films corrugated periodically in two directions. In solving the problem, we employed a computational technique based on modal expansion. Taking a sand wiched structure Vacuum/Ag/SiO2/Ag/Vacuum for an example, we observed: (1) excitation of a SISP mode at the lit surface of the 1st Ag layer with strong field enhancement for thick enough Ag layer case; (2) excitation of coupled SPR modes (SRSP or LRSP) at each surface between vacuum and Ag layers with strong field enhancements for thin enough Ag layer cases no matter with the thickness of SiO2 layers; (3) standing wave pattern of the electric filed in the SiO2 film. The coupled plasmon modes were resulted by the resonance waves excited on four surfaces in these cases.
Xun Xu Yoichi Okuno Taikei Suyama
Kyushu Sangyo University, Fukuoka, Japan South China Normal University, Guangzhou, China Akashi National College of Technology, Akashi, Japan
国际会议
Progress in Electromagnetics Research Symposium 2014(2014年电磁学研究新进展学术研讨会)
广州
英文
1314-1318
2014-08-01（万方平台首次上网日期，不代表论文的发表时间）