Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Ergebnis 24 von 67

Details

Autor(en) / Beteiligte
Titel
Cascaded nanooptics to probe microsecond atomic-scale phenomena
Ist Teil von
  • Proceedings of the National Academy of Sciences - PNAS, 2020-06, Vol.117 (26), p.14819-14826
Ort / Verlag
United States: National Academy of Sciences
Erscheinungsjahr
2020
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
  • Plasmonic nanostructures can focus light far below the diffraction limit, and the nearly thousandfold field enhancements obtained routinely enable few- and single-molecule detection. However, for processes happening on the molecular scale to be tracked with any relevant time resolution, the emission strengths need to be well beyond what current plasmonic devices provide. Here, we develop hybrid nanostructures incorporating both refractive and plasmonic optics, by creating SiO₂ nanospheres fused to plasmonic nanojunctions. Drastic improvements in Raman efficiencies are consistently achieved, with (single-wavelength) emissions reaching 10⁷ counts·mW−1·s−1 and 5 × 10⁵ counts·mW−1·s−1·molecule−1, for enhancement factors >1011. We demonstrate that such high efficiencies indeed enable tracking of single gold atoms and molecules with 17-μs time resolution, more than a thousandfold improvement over conventional high-performance plasmonic devices. Moreover, the obtained (integrated) megahertz count rates rival (even exceed) those of luminescent sources such as single-dye molecules and quantum dots, without bleaching or blinking.
Sprache
Englisch
Identifikatoren
ISSN: 0027-8424
eISSN: 1091-6490
DOI: 10.1073/pnas.1920091117
Titel-ID: cdi_pubmedcentral_primary_oai_pubmedcentral_nih_gov_7334475

Weiterführende Literatur

Empfehlungen zum selben Thema automatisch vorgeschlagen von bX