Abstract
We investigate the mechanisms for fluorescence enhancement and energy transfer near a gold tip in apertureless scanning near-field optical microscopy. Using a simple quasi-static model, we show that the observed enhancement of fluorescence results from competition between enhancement and quenching, and is dependent on a range of experimental parameters. We find good qualitative agreement with the results of measurements of the effect of both sharp and blunt tips on quantum dot fluorescence, and provide a demonstration of tip-enhanced fluorescence imaging with 60 nm resolution.
Original language | English |
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Pages (from-to) | S234 - S238 |
Journal | JOURNAL OF OPTICS A PURE AND APPLIED OPTICS |
Volume | 8 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Apr 2006 |