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Chemical and electromagnetic mechanisms of tip-enhanced Raman scattering

Sun, Mengtao; Fang, Yurui; Yang, Zhilin and Xu, Hongxing LU (2009) In Physical Chemistry Chemical Physics 11(41). p.9412-9419
Abstract
In this paper, we attempt to reveal the nature of the chemical and electromagnetic mechanisms of tip-enhanced Raman scattering (TERS). Direct visual evidence regarding the chemical mechanism via charge transfer was obtained with charge difference density. It is found that there are several kinds of charge transfer: (1) tip to molecule, (2) surface to molecule, (3) tip and surface to molecule simultaneously, and (4) tunneling charge transfer between the tip and the surface. Direct evidence regarding the electromagnetic mechanism via intracluster (tip or surface) charge redistribution was also revealed via charge difference density. The distance (between tip and surface) dependence of the near electric field distribution and the TERS... (More)
In this paper, we attempt to reveal the nature of the chemical and electromagnetic mechanisms of tip-enhanced Raman scattering (TERS). Direct visual evidence regarding the chemical mechanism via charge transfer was obtained with charge difference density. It is found that there are several kinds of charge transfer: (1) tip to molecule, (2) surface to molecule, (3) tip and surface to molecule simultaneously, and (4) tunneling charge transfer between the tip and the surface. Direct evidence regarding the electromagnetic mechanism via intracluster (tip or surface) charge redistribution was also revealed via charge difference density. The distance (between tip and surface) dependence of the near electric field distribution and the TERS enhancement at different incident lights is also discussed using the three-dimensional finite-difference time-domain (FDTD) method. The electromagnetic enhancement of double-tip TERS is approximately 10 times larger than that of conventional TERS. Theoretical results reveal that plasmon coupling effects between the metal tip and surface play an important role in TERS. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Chemistry Chemical Physics
volume
11
issue
41
pages
9412 - 9419
publisher
Royal Society of Chemistry
external identifiers
  • wos:000270795500013
  • scopus:70350044879
ISSN
1463-9084
DOI
10.1039/b909006a
language
English
LU publication?
yes
id
4bc0ebef-9f84-4d8e-b7b4-9edff4977161 (old id 1505979)
date added to LUP
2009-11-23 16:40:04
date last changed
2017-08-27 04:33:34
@article{4bc0ebef-9f84-4d8e-b7b4-9edff4977161,
  abstract     = {In this paper, we attempt to reveal the nature of the chemical and electromagnetic mechanisms of tip-enhanced Raman scattering (TERS). Direct visual evidence regarding the chemical mechanism via charge transfer was obtained with charge difference density. It is found that there are several kinds of charge transfer: (1) tip to molecule, (2) surface to molecule, (3) tip and surface to molecule simultaneously, and (4) tunneling charge transfer between the tip and the surface. Direct evidence regarding the electromagnetic mechanism via intracluster (tip or surface) charge redistribution was also revealed via charge difference density. The distance (between tip and surface) dependence of the near electric field distribution and the TERS enhancement at different incident lights is also discussed using the three-dimensional finite-difference time-domain (FDTD) method. The electromagnetic enhancement of double-tip TERS is approximately 10 times larger than that of conventional TERS. Theoretical results reveal that plasmon coupling effects between the metal tip and surface play an important role in TERS.},
  author       = {Sun, Mengtao and Fang, Yurui and Yang, Zhilin and Xu, Hongxing},
  issn         = {1463-9084},
  language     = {eng},
  number       = {41},
  pages        = {9412--9419},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical Chemistry Chemical Physics},
  title        = {Chemical and electromagnetic mechanisms of tip-enhanced Raman scattering},
  url          = {http://dx.doi.org/10.1039/b909006a},
  volume       = {11},
  year         = {2009},
}