NDLI: Negative refraction, growing evanescent waves, and sub-diffraction imaging in loaded transmission-line metamaterials

Content Provider	IEEE Xplore Digital Library
Author	Grbic, A. Eleftheriades, G.V.
Copyright Year	1963
Abstract	We present an analytical formulation that shows the negative refraction of propagating waves and the growth of evanescent waves within a negative refractive index (NRI) lens made of a periodically L, C loaded transmission-line (TL) network, referred to as the dual-TL structure. A transformation known as the "array scanning method" is then employed to analytically demonstrate the sub-diffraction imaging capability of a dual-TL lens. In essence, the two-dimensional (2-D) periodic Green's functions corresponding to the voltages and currents excited by a vertical elementary current source are derived. The developed theory is utilized to plot the 2-D voltage magnitude distribution for the case of focusing an elementary current source. The analysis reveals that a resolution limit is imposed by the periodicity of the NRI medium used. Moreover, the periodicity of the NRI medium bounds the amplitude of the growing evanescent waves in a realizable NRI lens and prevents them from growing to unphysically large values.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	2297
Ending Page	2305
Page Count	9
File Size	779429
File Format	PDF
ISSN	00189480
Volume Number	51
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transmission lines Metamaterials Lenses Focusing Slabs Optical materials Refractive index Two dimensional displays Voltage Permittivity
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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Negative refraction, growing evanescent waves, and sub-diffraction imaging in loaded transmission-line metamaterials

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