EPL, 84 (2008) 34001
DOI: 10.1209/0295-5075/84/34001

Causality in the resonance behavior of metamaterials

R. 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

mattomato811118@yahoo.com.cn

received 4 July 2008; accepted in final form 22 September 2008; published November 2008
published online 20 October 2008

Abstract
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.

PACS
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