Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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High-Resolution Fluorescence Near-Field Imaging of Individual Nanoparticles via the Tip-Induced Quenching Technique

  • Park, Won-Hwa (Department of Chemistry and Center for Photo- and Electro-Responsive Molecules, Korea University) ;
  • Kim, Zee-Hwan (Department of Chemistry and Center for Photo- and Electro-Responsive Molecules, Korea University)
  • Published : 2007.12.20
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Abstract

We demonstrate that high-resolution (~60 nm) near-field fluorescence images of fluorescent nanospheres can be obtained by utilizing the tip-induced fluorescence quenching process. A time-stamped photon counting (TSPC) technique employed enables us to efficiently measure the degree of fluorescence quenching caused by the dielectric or metallic atomic force microscopy tip. We find that the degree of quenching is not only determined by the tip-material but also by the local morphology of the tip. The fringe patterns around individual nanospheres observed are explained in terms of the interference between the excitation field that is directly induced by the laser source, and the scattered excitation field from the tip.

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