Open AccessExtraction of effective constitutive parameters of active terahertz metamaterial with negative differential resistance carbon nanotubes
Author(s) -
Si Li-Ming,
Hou Ji-Xuan,
Yong Liu,
Liwei Xin
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.037806
Subject(s) - metamaterial , terahertz radiation , materials science , permittivity , carbon nanotube , dispersion (optics) , optoelectronics , optics , nanotechnology , physics , dielectric
A strategy is presented to acquire active terahertz (THz) metamaterial by incorporating negative differential resistance carbon nanotubes. Furthermore, we propose a method of extracting active metamaterial effective parameters. This new method can effectively solve the problems of signs and multi-branches, while the traditional parameter extraction method becomes powerless for active case. Our results indicate that the active THz metamaterial with metal wires array not only has negative value of the imaginary part of the permittivity but also presents magnetic-dispersion characteristics.