Propagation loss of terahertz surface plasmon polaritons on a periodically structured Ag surface
2008 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 104, no 10, 103531- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2008. Vol. 104, no 10, 103531- p.
finite difference time-domain analysis, optical dispersion, optical losses, polaritons, submillimetre wave propagation, surface plasmons
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-46998DOI: 10.1063/1.3021108ISI: 000262605800057ScopusID: 2-s2.0-57049131519OAI: oai:DiVA.org:kth-46998DiVA: diva2:454902
QC 201111082011-11-082011-11-072013-11-19Bibliographically approved