Journal
NANO LETTERS
Volume 14, Issue 5, Pages 2926-2933Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl501027j
Keywords
Nanomatryoshka; fluorescence enhancement; E-field; Fano resonance; Cy7; IR800
Categories
Funding
- National Science Foundation [NSF-MRI-ECCS-1040478]
- Robert A. Welch Foundation [C-1220, C-1222]
- NIH [U01 CA151886, 5R01 CA151962]
- National Security Science and Engineering Faculty Fellowship (NSSEFF) [N00244-09-1-0067]
- U.S. Army Research Office MURI [WF911NF-12-1-0407]
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Metallic nanoparticles exhibiting plasmonic Fano resonances can provide large enhancements of their internal electric near field. Here we show that nanomatryoshkas, nanoparticles consisting of an Au core, an interstitial nanoscale SiO2 layer, and an Au shell layer, can selectively provide either a strong enhancement or a quenching of the spontaneous emission of fluorophores dispersed within their internal dielectric layer. This behavior can be understood by taking into account the near-field enhancement induced by the Fano resonance of the nanomatryoshka, which is responsible for enhanced absorption of the fluorophores incorporated. into the nanocomplex. The combination of compact size and enhanced light emission with internal encapsulation of the fluorophores for increased biocompatibility suggests outstanding potential for this type of nanoparticle complex in biomedical applications.
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