Metal nanoparticle-enhanced radiative transitions: Giving singlet oxygen emission a boost
Journal article, 2011

The fabrication and use of metal nanoparticles to influence electronic transitions in a given molecule is of growing interest; there is much to be gained by developing and exploiting methods to enhance weak optical signals. Singlet molecular oxygen, O-2(a(1)Delta(g)), which is an important intermediate in many oxidation reactions, particularly in biological systems, is ideally monitored by the 1275-nm O-2(a(1)Delta(g)) -> O-2(X-3 Sigma(-)(g)) phosphorescent transition. Unfortunately, the latter is highly forbidden and, as such, often presents a severe limitation in the application of this optical probe. In this paper, we describe how this weak phosphorescent transition can be enhanced by using localized surface plasmons (LSPs) from specially engineered gold nanostructures. In an attempt to elucidate the mechanism of this process, data were recorded from samples in which we decoupled the component of the plasmon resonance that absorbs incident light from the component that scatters incident light. We find that the latter appears to be the feature of significance in the process through which singlet oxygen phosphorescence is enhanced. In this work, we also illustrate how the singlet oxygen system provides an ideal model for a general study of metal-enhanced radiative rate constants.

radiative transition

metal-enhanced fluorescence



fluorescence intensity

colloidal lithography

singlet oxygen

plasmon resonances

gold nanoparticles


gold nanoparticles


surface plasmon




R. Toftegaard

Aarhus University

J. Arnbjerg

Aarhus University

H. P. Cong

Aarhus University

Hossein Agheli

Chalmers, Applied Physics, Biological Physics

D. S. Sutherland

Aarhus University

P. R. Ogilby

Aarhus University

Pure and Applied Chemistry

0033-4545 (ISSN)

Vol. 83 4 885-898

Subject Categories

Chemical Sciences



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