title: Fluorescence enhancement of molecules inside a gold nanomatryoshka.
abstract: 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.
authors.affiliation: Department of Chemistry, ‡Department of Physics and Astronomy, §Department of Electrical and Computer Engineering, and ∥Laboratory for Nanophotonics, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
authors.forename: Ciceron
authors.initials: C
authors.lastname: Ayala-Orozco
authors.forename: Jun G
authors.initials: JG
authors.lastname: Liu
authors.forename: Mark W
authors.initials: MW
authors.lastname: Knight
authors.forename: Yumin
authors.initials: Y
authors.lastname: Wang
authors.forename: Jared K
authors.initials: JK
authors.lastname: Day
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Naomi J
authors.initials: NJ
authors.lastname: Halas
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D005453:Fluorescence; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D013059:Spectrum Analysis, Raman
chemical_list: D006046:Gold; D012822:Silicon Dioxide
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