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Study of active superlens and evanescent wave amplification using an active metamaterial model

Published online by Cambridge University Press:  17 September 2009

N. N. Wan ,
D. Huang ,
Q. Cheng ,
W. X. Jiang ,
R. Liu  and
T. J. Cui
N. N. Wan
Affiliation:
State Key Laboratory of Millimeter Waves and Institute of Target Characteristics and Identification, Southeast University, 210096 Nanjing, P.R. China
D. Huang
Affiliation:
State Key Laboratory of Millimeter Waves and Institute of Target Characteristics and Identification, Southeast University, 210096 Nanjing, P.R. China
Q. Cheng
Affiliation:
State Key Laboratory of Millimeter Waves and Institute of Target Characteristics and Identification, Southeast University, 210096 Nanjing, P.R. China
W. X. Jiang*
Affiliation:
State Key Laboratory of Millimeter Waves and Institute of Target Characteristics and Identification, Southeast University, 210096 Nanjing, P.R. China
R. Liu
Affiliation:
State Key Laboratory of Millimeter Waves and Institute of Target Characteristics and Identification, Southeast University, 210096 Nanjing, P.R. China
T. J. Cui
Affiliation:
State Key Laboratory of Millimeter Waves and Institute of Target Characteristics and Identification, Southeast University, 210096 Nanjing, P.R. China
*
wxjiang@emfield.org tjcui@seu.edu.cn
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Abstract

We propose a Π-shaped circuit model for active metamaterials using periodic circuit structures with series inductors and shunt capacitors (LC) and series capacitors and shunt inductors (CL). Using the circuit model, we develop a general theory for active metamaterials, revealing the role of active components and demonstrating the principle for metamaterials to be active. Byinserting negative and positive resistances in the LC and CL structures, we first attain the active superlens using three slabs of effective media made by such metamaterial circuit structures andshow that the amplitude of voltage will be augmented on two interfaces after adding the active/lossy components. Then we realize the active amplification of evanescent waves and show that thetransmission coefficient will be larger than 0 dB near the resonant frequency, which evidently illustrates the active feature of the medium. Both of these two applications have to satisfy theanti-matching conditions to fulfill the resonance and tunneling effect.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 48 , Issue 2 , November 2009 , 21101
Copyright
© EDP Sciences, 2009

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