Molecular Orbital Gates for Plasmon Excitation
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- 作者：Theresa Lutz ; Christoph Gro脽e ; Christian Dette ; Alexander Kabakchiev ; Frank Schramm ; Mario Ruben ; Rico Gutzler ; Klaus Kuhnke ; Uta Schlickum ; Klaus Kern
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：June 12, 2013
- 年：2013
- 卷：13
- 期：6
- 页码：2846-2850
- 全文大小：320K
- 年卷期：v.13,no.6(June 12, 2013)
- ISSN：1530-6992
文摘
Future combinations of plasmonics with nanometer-sized electronic circuits require strategies to control the electrical excitation of plasmons at the length scale of individual molecules. A unique tool to study the electrical plasmon excitation with ultimate resolution is scanning tunneling microscopy (STM). Inelastic tunnel processes generate plasmons in the tunnel gap that partially radiate into the far field where they are detectable as photons. Here we employ STM to study individual tris-(phenylpyridine)-iridium complexes on a C60 monolayer, and investigate the influence of their electronic structure on the plasmon excitation between the Ag(111) substrate and an Ag-covered Au tip. We demonstrate that the highest occupied molecular orbital serves as a spatially and energetically confined nanogate for plasmon excitation. This opens the way for using molecular tunnel junctions as electrically controlled plasmon sources.