Borys, Nicholas J. and Shafran, Eyal and Lupton, John M. (2013) Surface plasmon delocalization in silver nanoparticle aggregates revealed by subdiffraction supercontinuum hot spots. SCIENTIFIC REPORTS, 3: 2090. ISSN 2045-2322,
Full text not available from this repository. (Request a copy)Abstract
The plasmonic resonances of nanostructured silver films produce exceptional surface enhancement, enabling reproducible single-molecule Raman scattering measurements. Supporting a broad range of plasmonic resonances, these disordered systems are difficult to investigate with conventional far-field spectroscopy. Here, we use nonlinear excitation spectroscopy and polarization anisotropy of single optical hot spots of supercontinuum generation to track the transformation of these plasmon modes as the mesoscopic structure is tuned from a film of discrete nanoparticles to a semicontinuous layer of aggregated particles. We demonstrate how hot spot formation from diffractively-coupled nanoparticles with broad spectral resonances transitions to that from spatially delocalized surface plasmon excitations, exhibiting multiple excitation resonances as narrow as 13 meV. Photon-localization microscopy reveals that the delocalized plasmons are capable of focusing multiple narrow radiation bands over a broadband range to the same spatial region within 6 nm, underscoring the existence of novel plasmonic nanoresonators embedded in highly disordered systems.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ENHANCED RAMAN-SCATTERING; RESONANCE SPECTROSCOPY; METAL NANOPARTICLES; OPTICAL-PROPERTIES; FIELD; LIGHT; FILMS; LOCALIZATION; MICROSCOPY; SERS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Apr 2020 11:04 |
| Last Modified: | 07 Apr 2020 11:04 |
| URI: | https://pred.uni-regensburg.de/id/eprint/16488 |
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