Research Article


2015, 8(1): 303–319


Interface dipole enhancement effect and enhanced Rayleigh scattering

Wenyun Wu1,§, Jingying Yue1, §, Dongqi Li1, Xiaoyang Lin1, Fangqiang Zhu2, Xue Yin3, Jun Zhu3, Xingcan Dai1 (*), Peng Liu1, Yang Wei1, Jiaping Wang1, Haitao Yang1, Lina Zhang1, Qunqing Li1, Shoushan Fan1, and Kaili Jiang1,4 (*)

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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 § These authors contributed equally to this work.

Keywords: interface dipole enhancement, dielectric sphere, near filed, nanomaterials, carbon nanotubes, Rayleigh scattering
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  • Abstract
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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 situRayleigh 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.
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Interface dipole enhancement effect and enhanced Rayleigh scattering. Nano Res. 2015, 8(1): 303–319

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