Interface dipole enhancement effect and enhanced Rayleigh scattering
interface dipole enhancement, dielectric sphere, near filed, nanomaterials, carbon nanotubes, Rayleigh scattering
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.
Tsinghua University Press
Wenyun Wu,Jingying Yue,Dongqi Li,Xiaoyang Lin,Fangqiang Zhu,Xue Yin,Jun Zhu,Xingcan Dai,Peng Liu,Yang Wei,Jiaping Wang,Haitao Yang,Lina Zhang,Qunqing Li,Shoushan Fan,Kaili Jiang, Interface dipole enhancement effect and enhanced Rayleigh scattering. NanoRes.2015, 8(1): 303–319