Phase conjugation and negative refraction using nonlinear active metamaterials.
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2010-09-17
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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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Katko, Alexander R, Shi Gu, John P Barrett, Bogdan-Ioan Popa, Gennady Shvets and Steven A Cummer (2010). Phase conjugation and negative refraction using nonlinear active metamaterials. Phys Rev Lett, 105(12). p. 123905. 10.1103/PhysRevLett.105.123905 Retrieved from https://hdl.handle.net/10161/4301.
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Steven A. Cummer
Dr. Steven Cummer received his Ph.D. in Electrical Engineering from Stanford University in 1997 and prior to joining Duke University in 1999 he spent two years at NASA Goddard Space Flight Center as an NRC postdoctoral research associate. Awards he has received include a National Science Foundation CAREER award and a Presidential Early Career Award for Scientists and Engineers (PECASE) in 2001. His current work is in a variety of theoretical and experimental electromagnetic problems related to geophysical remote sensing and engineered electromagnetic materials.
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