文献类型：期刊文献

英文题名：Single Molecules in Strong Optical Fields: A Variable-Temperature Molecular Junction Spectroscopy Setup

作者：Bi, Hai[1];Jing, Chao[1,2,3];Hasch, Peter[1];Gong, Yuxiang[1];Gerster, Daniel[1];Barth, Johannes, V[1];Reichert, Joachim[1]

机构：[1]Tech Univ Munich, Phys Dept E20, D-85748 Garching, Germany;[2]Chinese Acad Sci, Shanghai Inst Appl Phys, Dept Hydrogen Tech, Shanghai 201800, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2021

卷号：93

期号：28

起止页码：9853

外文期刊名：ANALYTICAL CHEMISTRY

收录：;EI(收录号：20213010676490);WOS:【SCI-EXPANDED(收录号:WOS:000677481700024)】；

基金：This work was supported by the DFG via SPP 1243 (grant RE 2592/2), the China Scholarship Council, the Munich Center for Advanced Photonics (MAP, DFG) and ERC Advanced Grant MolArt (no. 47299), the Shanghai Sailing Program (18YF1405700), and the National Natural Science Foundation of China (No. 21802042).

语种：英文

外文关键词：Molecules - Quantum chemistry - Surface plasmons - Plasmonics - Chemical analysis - Electron transport properties - Bond strength (chemical)

摘要：In order to advance the development of molecular electronic devices, it is mandatory to improve the understanding of electron transport and functionalities in single molecules, integrated in a well-defined environment. However, limited information can be obtained by solely analyzing I-V characteristics, whence multiparameter studies are required to obtain more information on such systems including chemical bonds, geometry, and intramolecular strain. Therefore, we developed an analytical method incorporating an optical near-field technique, which allows us to investigate single-molecule junctions at variable temperatures in strong optical fields. An apertureless near-field emitter acts as a counter electrode and a plasmonic waveguide to focus surface plasmon polaritons into the molecular junctions, where a strongly enhanced evanescent field is confined to only a few nanometers around the apex of the tip. The temperatures, is demonstrated by simultaneously investigating electronic and optical features of dithiol in dependence of its charge state. This multichannel method can be employed to analyze properties in single-molecule junctions such as photoconductance and photocurrent generation and molecular junctions by spectroscopic means as well.