亮点论文：李孝峰组在Nanoscale(6.233)发表论文
时间: 2015-07-25 作者: 浏览次数: 1684
标题：Plasmonic Fano resonances in nanohole quadrumers for ultra-sensitive refractive index sensing
作者：Yaohui Zhan#, Dang Yuan Lei,*# Xiaofeng Li* and Stefan A. Maier
摘要：
Plasmonic Fano resonances arising from electromagnetic interactions in metallic nanostructures exhibit spectral characteristics analogous tothose from the electron waves in oligomer molecules. Though a great deal of research interest has been attracted to study the opticalproperties and explore the associated applications of metallic nanoparticle oligomers, the plasmonic response of their complementarystructures � nanohole clusters � remains largely unexplored. Here we show numerically by a full-wave finite element method that a nanoholequadrumer can sustain two Fano resonances when the incident electric field is oriented along the long-axis of the quadrumer system.The underlying physical mechanisms responsible for the Fano resonance formation are revealed explicitly by spectrally deconstructing theFano lineshape, spatially decomposing the structure configuration and mapping the electric field profile and charge distribution, whichcollectively demonstrate a strong mode coupling between either two antiparallel dipolar modes or dipole�quadruple modes in the nanoholequadrumer. We further show that the spectral profile of the Fano resonance including the resonance linewidth and spectral contrast canbe engineered flexibly by adjusting the geometrical parameters of the nanohole cluster, including the nanohole diameter, film thickness andinterhole distance. With an optimized and realistic geometrical configuration, the nanohole quadrumer system exhibits an overall sensingfigure of merit up to 14.25, far surpassing the value reported for conventional nanoparticle oligomers.
原文链接：http://pubs.rsc.org/en/content/articlelanding/2014/nr/c3nr06024a#!divAbstract
作者：Yaohui Zhan#, Dang Yuan Lei,*# Xiaofeng Li* and Stefan A. Maier
摘要：
Plasmonic Fano resonances arising from electromagnetic interactions in metallic nanostructures exhibit spectral characteristics analogous tothose from the electron waves in oligomer molecules. Though a great deal of research interest has been attracted to study the opticalproperties and explore the associated applications of metallic nanoparticle oligomers, the plasmonic response of their complementarystructures � nanohole clusters � remains largely unexplored. Here we show numerically by a full-wave finite element method that a nanoholequadrumer can sustain two Fano resonances when the incident electric field is oriented along the long-axis of the quadrumer system.The underlying physical mechanisms responsible for the Fano resonance formation are revealed explicitly by spectrally deconstructing theFano lineshape, spatially decomposing the structure configuration and mapping the electric field profile and charge distribution, whichcollectively demonstrate a strong mode coupling between either two antiparallel dipolar modes or dipole�quadruple modes in the nanoholequadrumer. We further show that the spectral profile of the Fano resonance including the resonance linewidth and spectral contrast canbe engineered flexibly by adjusting the geometrical parameters of the nanohole cluster, including the nanohole diameter, film thickness andinterhole distance. With an optimized and realistic geometrical configuration, the nanohole quadrumer system exhibits an overall sensingfigure of merit up to 14.25, far surpassing the value reported for conventional nanoparticle oligomers.
原文链接：http://pubs.rsc.org/en/content/articlelanding/2014/nr/c3nr06024a#!divAbstract