Journal
NANO LETTERS
Volume 13, Issue 4, Pages 1724-1729Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl4003188
Keywords
Plasmonics; nanopore; ionic noise; mapping; photocatalysis
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Funding
- FWO (Flanders)
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The ionic properties of a metal-coated silicon nanopore were examined in a nanofluidic system. We observed a strong increase of the ionic noise upon laser light illumination. The effect appeared to be strongly mediated by the resonant excitation of surface plasmons in the nanopore as was demonstrated by means of ionic mapping of the plasmonic electromagnetic field. Evidence from both simulations and experiments ruled out plasmonic heating as the main source of the noise, and point toward photoinduced electrochemical catalysis at the semiconductor-electrolyte interface. This ionic mapping technique described is opening up new opportunities on noninvasive applications ranging from biosensing to energy conversion.
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