Open AccessAn explicit formula for metal wire plasmon of terahertz wave
Author(s) -
Jie Yang,
Qing Cao,
Changhe Zhou
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.020806
Subject(s) - terahertz radiation , plasmon , optics , bessel function , terahertz spectroscopy and technology , materials science , refractive index , physics
An explicit formula for metal wire plasmon of terahertz wave is analytically derived. The derivation is based on the huge relative permittivities of nonmagnetic metals in the spectral region of terahertz wave, some important properties of modified Bessel functions, and a suitable Taylor expansion. The obtained formula is further checked by many numerical tests. We find that, for all 11 tested nonmagnetic metals, for the whole spectral region of terahertz wave, and for the wide radius range from 10 microm to infinity, the relative deviation for the effective index is always smaller than 5%. This good agreement clearly shows that the derived expression can be conveniently used for the analysis and design of metal wire plasmon of terahertz wave.