Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3579241
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Funding
- NSFC [10974144, 60674778]
- National 863 Program of China [2006AA03Z407]
- NCET [07-0621]
- STCSM
- SHEDF [06SG24]
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We propose a scheme for subwavelength electromagnetic diode by employing cascading nonlinear meta-atoms. One-way response is conceptually demonstrated on a microwave transmission line comprising of three metallic ring resonators acting as meta-atoms and a varactor as the nonlinear medium inclusion. Experiments show that our implementation can operate simultaneously as forward diode and backward diode at different frequencies. A transmission contrast of up to 14.7 dB was achieved between forward and backward transmission. Subwavelength size of our diode should be useful for miniaturization of integrated optical nanocircuits. (C) 2011 American Institute of Physics. [doi:10.1063/1.3579241]
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