Propagation loss of terahertz surface plasmon polaritons on a periodically structured Ag surface

被引：11

作者：

Wang, Bowen ^{[1
,3
]}

Liu, Liu ^{[1
,3
]}

He, Sailing ^{[1
,2
,3
]}

机构：

[1] Zhejiang Univ, Ctr Opt & Electromagnet Res, Hangzhou 310058, Zhejiang, Peoples R China

[2] Royal Inst Technol, Sch Elect Engn, Div Electromagnet Theory, S-10044 Stockholm, Sweden

[3] Royal Inst Technol, Joint Res Ctr Photon, Stockholm, Sweden

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 104卷 / 10期

基金：

中国国家自然科学基金; 瑞典研究理事会;

关键词：

finite difference time-domain analysis; optical dispersion; optical losses; polaritons; submillimetre wave propagation; surface plasmons;

D O I：

10.1063/1.3021108

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We analyze the propagation of terahertz surface plasmon polaritons on a periodically structured Ag surface by using a full-vectorial finite-difference time-domain method. The impact of some structural parameters on the dispersion relation and the propagation loss is analyzed. As the groove width increases, the dispersion curves asymptotically reach lower frequency values at the Brillouin zone edge, while the relation between the propagation loss and the groove width is somewhat complicated. For a fixed air filling factor, the period of the structure has little influence on the asymptotic frequency but has a relatively large influence on the propagation loss. The effects of the groove depth and the shape of the groove corners are also studied. It is found that the propagation loss is mainly determined by the total area of the sidewalls of the grooves in a unit length. For a typical structure with a groove width of 2 mu m, a groove depth of 10 mu m, and a period of 10 mu m, the propagation loss is less than 0.2 dB/10 mu m below 5.67 THz, while it increases dramatically beyond this frequency.

引用

页数：6