期刊
PHYSICA B-CONDENSED MATTER
卷 394, 期 2, 页码 208-212出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2006.12.015
关键词
coupled plasmons; plasmonics; confinement; transitions
Plasmonic waves occur in the subwavelength scale with transverse confinement below the diffraction limit. In this work, we report results of longitudinal localization-delocalization transitions of coupled plasmon modes in graded chains of metallic nanodots. Two graded models are studied: graded index of refraction in the host medium and incremental spacing between the nanoparticles. The coupled plasmon modes in these graded systems exhibit strong localization, showing a tunable passband in finite size systems. These localized modes survive in presence of weak loss in the nanodots. To understand the localization mechanism, we construct equivalent systems of one-dimensional coupled harmonic oscillators, whose coupling strength or masses are gradually varied from one end to the other, with additional on-site potentials. Confining and transmitting electromagnetic energy in these structures may pave new way for many fruitful applications in plasmonics. (c) 2007 Elsevier B.V. All rights reserved.
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