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Phase Conjugation and Negative Refraction using Nonlinear Active Metamaterials

Alexander R. Katko, Shi Gu, John P. Barrett, Bogdan-Ioan Popa, Gennady Shvets, and Steven A. Cummer
Phys. Rev. Lett. 105, 123905 – Published 17 September 2010
Physics logo See Synopsis: Proactive metamaterials

Abstract

We present an experimental demonstration of phase conjugation using nonlinear metamaterial elements. Active split-ring resonators loaded with varactor diodes are demonstrated theoretically to act as phase-conjugating or time-reversing discrete elements when parametrically pumped and illuminated with appropriate frequencies. The metamaterial elements were fabricated and shown experimentally to produce a time-reversed signal. Measurements confirm that a discrete array of phase-conjugating elements act as a negatively refracting time-reversal rf lens only 0.12λ thick.

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  • Received 28 April 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.123905

© 2010 The American Physical Society

Synopsis

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Proactive metamaterials

Published 17 September 2010

Structurally engineered electromagnetic materials have now been made from active elements, expanding the range of possible optical effects in such so-called “metamaterials.”

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Authors & Affiliations

Alexander R. Katko1, Shi Gu1, John P. Barrett1, Bogdan-Ioan Popa1, Gennady Shvets2, and Steven A. Cummer1,*

  • 1Department of Electrical and Computer Engineering and Center for Metamaterials and Integrated Plasmonics, Duke University, Durham, North Carolina 27708, USA
  • 2Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA

  • *cummer@ee.duke.edu

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Issue

Vol. 105, Iss. 12 — 17 September 2010

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