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Abstract
The electromagnetic wave tunneling phenomenon in a sandwich structure consisting of epsilon-negative (ENG), mu-negative (MNG), and epsilon-negative (ENG) media was investigated. Merging of resonance tunneling modes is demonstrated when the conjugate matched trilayer condition is satisfied. The resonance frequency is found to be independent of the thickness ratio of the matched trilayer structure. The resonance tunneling possesses particular angular-dependent and polarization-free properties. The electric fields corresponding to the frequencies of the resonance modes are found to be strongly localized at just one interface with low transmittance. The possible influence on resonance tunneling due to the losses from the single-negative materials is also investigated.
Acknowledgements
This work was supported by the State Key Program Foundation of China (grant E0310/1112/JC02), the National High Technology Research Development Special Fund (863 Project) of China (grant 2006AA12Z152), the National Defense Basal Scientific Research Foundation of China (grant A1420080187), and the NSFC (grants 40875013, 40375010, and 60278019).