Graded plasmonic structures and their properties
Chapter in an edited book (author)



摘要Plasmonic structures have extraordinary optical properties in terms of engineering surface plasmon for optical waveguiding, switching, sensing, and enhanced optical spectroscopies such as surface enhanced Raman spectroscopy (SERS) and strong nonlinear optical effects. In particular, there is a type of plasmonic structures which have spatially varying characteristics-graded plasmonic structures-that enable extremely flexible and strong confinement of surface plasmon in real space, making it easier to control hot spots, surface signal propagation distance and direction. We show that a peculiar kind of confined plasmon modes, called plasmonic gradons, can occur in such graded plasmonic structures. The plasmonic gradons are different from either disorder-induced Anderson-type localization in random media or Bragg-gap type confinement that is supported by periodic structures. We identify several localizationdelocalization transitions between various plasmonic gradons which are of distinct flavors and are uniquely sustainable in these graded plasmonic structures. To this end, we also discuss the interplay between gradon confinement and a variety of oscillations, such as Bloch oscillation and breathing-like oscillation. To have a deep understanding of the plasmonic gradon physics, an analogous problem in graded elastic lattices with tunable on-site potentials are proposed. © 2011 by Nova Science Publishers, Inc. All rights reserved.
著者Xiao J.J., Yakubo K., Yu K.W.
編輯ed. by Kristina N. Helsey.
詳細描述ed. by Kristina N. Helsey.
頁次289 - 326
關鍵詞Graded plasmonic structure, Graded structure, Localization-delocalization transition, Plasmonic gradons

上次更新時間 2020-02-09 於 00:50