Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 22, Issue 8, Pages 1763-1769Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.22.001763
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Electromagnetic ring resonators composed of noncontacting metal nanoparticles are analyzed as building blocks of future plasmonic optical systems. Closed-form expressions for the electromagnetic modes are obtained, and conditions under which such structures exhibit low or high radiative losses are found. Most modes for subwavelength structures exhibit strongly suppressed radiative losses. Possible applications for subwavelength resonators are discussed. Nearest-neighbor tight-binding models are shown to be of severely circumscribed validity. (c) 2005 Optical Society of America.
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