Causality in the resonance behavior of metamaterialsR. Yang, Y. J. Xie, X. F. Li, Y. Y. Wang, R. Wang and J. Jiang
National Laboratory of Antennas and Microwave Technology, Xidian University - Xi'an 710071, China
received 4 July 2008; accepted in final form 22 September 2008; published November 2008
published online 20 October 2008
A rigorous full wave analysis of bianisotropic split ring resonator (SRR) metamaterials is presented for different electromagnetic field polarization and propagation directions. An alternative physical explanation for SRR resonance band gaps is gained by revealing the fact that an imaginary wave number leads to the SRR resonance. The field distribution over SRRs is then expanded into Floquet modes for further examination. As is shown, the metamaterial resonance is engendered by the evanescent modes which accords with the full wave analysis.
41.20.Jb - Electromagnetic wave propagation; radiowave propagation.
61.05.-a - Techniques for structure determination.
71.15.-m - Methods of electronic structure calculations.
© EPLA 2008