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The role of absorption and dispersion in resonant tunnelling through a negative index medium

Published online by Cambridge University Press:  23 December 2010

D. Golla ,
S. Deb  and
S. Dutta Gupta
D. Golla
Affiliation:
Indian Institute of Technology Kharagpur, 721302 Kharagpur, India
S. Deb*
Affiliation:
School of Physics, University of Hyderabad, 500046 Hyderabad, India
S. Dutta Gupta
Affiliation:
School of Physics, University of Hyderabad, 500046 Hyderabad, India
*
[email protected]
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Abstract

We study resonant tunneling through a layered medium with a passive negative index medium (NIM) slab as a constituent layer. Using a causalmodel for susceptibilities with the parameters of a recently reported metamaterial [G. Dolling, C. Enkrich, M. Wegener, C.M. Soukoulis, S. Linden, Opt. Lett. 31, 1800 (2006)] we show that resonant tunnelling and the associated delay are mostly suppressed. This is in sharp contrast with the naive approach of retaining phase velocity dispersion with arbitrary low losses, predicting sharp resonances with large associated delays. This is shown to be a nontrivial issue because of the necessity of losses for NIM behaviour, while their presence spoils the quality factor of the resonant devices.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 53 , Issue 1 , January 2011 , 10702
Copyright
© EDP Sciences, 2010

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