Interface dipole enhancement effect and enhanced Rayleigh scattering

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• 作者：Wenyun Wu (1)
  Jingying Yue (1)
  Dongqi Li (1)
  Xiaoyang Lin (1)
  Fangqiang Zhu (2)
  Xue Yin (3)
  Jun Zhu (3)
  Xingcan Dai (1)
  Peng Liu (1)
  Yang Wei (1)
  Jiaping Wang (1)
  Haitao Yang (1)
  Lina Zhang (1)
  Qunqing Li (1)
  Shoushan Fan (1)
  Kaili Jiang (1) (4)
  
  1. State Key Laboratory of Low-Dimensional Quantum Physics ; Department of Physics & Tsinghua-Foxconn Nanotechnology Research Center ; Tsinghua University ; Beijing ; 100084 ; China
  2. Department of Physics ; Indiana University-Purdue University Indianapolis ; Indianapolis ; Indiana ; USA
  3. State Key Laboratory of Precision Measurement Technology and Instruments ; Department of Precision Instruments ; Tsinghua University ; Beijing ; 100084 ; China
  4. Collaborative Innovation Center of Quantum Matter ; Beijing ; 100084 ; China
  
• 关键词：interface dipole enhancement ; dielectric sphere ; near filed ; nanomaterials ; carbon nanotubes ; Rayleigh scattering
• 刊名：Nano Research
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：8
• 期：1
• 页码：303-319
• 全文大小：3,661 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000

文摘

The optical effect of a nanometer or sub-nanometer interfacial layer of condensed molecules surrounding individual nanomaterials such as single-walled carbon nanotubes (SWCNTs) has been studied theoretically and experimentally. This interfacial layer, when illuminated by light, behaves as an optical dipole lattice and contributes an instantaneous near field which enhances the local field on neighboring atoms, molecules, or nanomaterials, which in turn may lead to enhanced Rayleigh scattering, Raman scattering, and fluorescence. The theory of this interface dipole enhanced effect (IDEE) predicts that a smaller distance between the nanomaterials and the plane of the interfacial layer, or a larger ratio of the dielectric constants of the interfacial layer to the surrounding medium, will result in a larger field enhancement factor. This prediction is further experimentally verified by several implementations of enhanced Rayleigh scattering of SWCNTs as well as in situ Rayleigh scattering of gradually charged SWCNTs. The interface dipole enhanced Rayleigh scattering not only enables true-color real-time imaging of nanomaterials, but also provides an effective means to peer into the subtle interfacial phenomena.