An explicit formula for metal wire plasmon of terahertz wave.
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.
Yang
Jie
J
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, 390 Qinghe Road, Jiading District, Shanghai 201800, China.
Cao
Qing
Q
Zhou
Changhe
C
D055590:Electromagnetic Phenomena; D007259:Infrared Rays; D008280:Magnetics; D008670:Metals / Q000737:chemistry; D015233:Models, Statistical; D008962:Models, Theoretical; D055095:Optics and Photonics; D015203:Reproducibility of Results; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods; D055053:Terahertz Radiation
D008670:Metals