Optically-driven collapse of a plasmonic nanogap self-monitored by optical frequency mixing.
Nano Lett
; 10(4): 1522-8, 2010 Apr 14.
Article
en En
| MEDLINE
| ID: mdl-20353196
ABSTRACT
A nanoparticle separated from a metallic surface by a few-nanometer thick polymer layer forms a nanoscale junction, or nanogap. Illuminating this structure with ultrashort optical pulses, exciting the plasmon resonance, results in a continuous, monitorable collapse of the nanogap. The four-wave mixing signal generated by this illumination of the nanogap provides a simultaneous monitoring of the collapse, increasing dramatically upon gap closure. Collapse is irreversible, occurring with simultaneous ablation of the dielectric from the junction.
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2010
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Article