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Radiation enhancement and radiation suppression by a left‐handed metamaterial
Author(s) -
Boardman A. D.,
Marinov K.
Publication year - 2006
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.22010
Subject(s) - perfect conductor , metamaterial , optics , antenna (radio) , physics , dipole antenna , conductor , superposition principle , microwave , radiation , reflection (computer programming) , electrical engineering , engineering , computer science , mathematics , geometry , scattering , quantum mechanics , programming language
The perfect lens property of a dispersive and lossy left‐handed metamaterial disk is exploited to superimpose a source of electromagnetic radiation onto its mirror image, formed as a result of reflection from a perfect electric conductor or a perfect magnetic conductor. The superposition of a vertical wire‐dipole antenna with its perfect electric conductor image results in an increase of the radiation resistance of the antenna compared with that of an antenna emitting in free space. On the other hand, if the same antenna is coupled to a perfect magnetic conductor image, it is shown that the result is the formation of a nonradiating configuration. The finite‐difference time‐domain analysis is performed, and this allows a detailed characterization of the systems. It is shown that the nonradiating system allows relatively large amounts of electromagnetic energy to be stored in the left‐handed metamaterial disk and that is indicative of strong electromagnetic fields inside the material. This property is employed in a second‐harmonic generation process and the potential of a nonradiating configuration as an efficient nonlinear device is demonstrated. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48:2512–2516, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22010