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Modulation of local plasmon mediated emission through molecular manipulation

2009; American Physical Society; Volume: 79; Issue: 7 Linguagem: Inglês

10.1103/physrevb.79.075406

1550-235X

Y. Zhang, Xiaoqiang Tao, Hong‐Ying Gao, Zhen‐Chao Dong, Jian Hou, Takayuki Okamoto,

Plasmonic and Surface Plasmon Research

We use single molecular manipulation to investigate the modulation effect of adsorbed molecules on local plasmon mediated emission (LPME) from the Au surface. Tunneling electron excited luminescence spectra indicate an overall suppression of LPME when an intact or excised CoOEP molecule is inserted into the junction. However, the LPME for the excised molecule is found to be stronger than that of the intact molecule, somewhat unexpected for a slightly larger molecule-substrate separation. We attribute such enhancement to a competing result of three different kinds of roles an adsorbed molecule can play in LPME: a geometric dielectric spacer, an energy dissipater, and a dynamic dipole oscillator.