Evanescent Growth and Tunneling Through Stacks of Frequency-Selective Surfaces

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Frequency selective surfaces
growing exponential
metamaterials
negative refraction
resonance
tunneling
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The presence of wave tunneling and the “growing evanescent envelope” for field distributions in suitably designed, periodically layered stacks of frequency selective surfaces (FSS) is discussed in this letter. It is known that a slab of double-negative (DNG) or left-handed metamaterial sandwiched between two vacuum half-spaces may lead to “growing” evanescent plane waves, which may be used to restore sub-wavelength information in Pendry’s “perfect” lens (Phys. Rev. Lett., vol. 85, pg. 3966, 2000). In this letter, it is shown that a completely different setup allows an analogous buildup of evanescently modulated waves. In particular, it is shown how an interface resonance phenomenon similar to the one present at the interface between metamaterials with oppositely signed constitutive parameters may be induced by a proper choice of the periodicities of the FSS stacks and the geometrical properties of these surfaces. The analysis is performed through an equivalent transmission-line approach, and some physical insights into this phenomenon are presented. Salient features, such as the complete wave tunneling through the pair of cascaded FSS, each operating at its bandgap, are presented and discussed.

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2005-12-05
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Copyright 2005 IEEE. Reprinted from IEEE Antennas and Wireless Propagation Letters, Volume 4, Issue 11, December 05, 2005, pages 417-420. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Pennsylvania's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
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