Enhancement of Single-Molecule Fluorescence Using a Gold Nanoparticle as an Optical Nanoantenna

Kühn, Sergei; Håkanson, Ulf; Rogobete, L.; Sandoghdar, Vahid

doi:10.1103/physrevlett.97.017402

Cited by 1,464 publications

(1,214 citation statements)

References 25 publications

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“…S13. We remark that recent works have shown that, in fact, structures as simple as single plasmonic nanospheres 24 , nanodisks 25 or nanorods 26 can act as optical antennas with strong scattering properties and large optical near-field enhancement 20,21,24 . Printing such plasmonic nanostructures may also be employed for applications in gas sensing 27 , graphene pholtovoltaics 28 or low-energy photon detection 29 .…”

Section: Structure Growth By Electrostatic Nanodroplet Autofocussingmentioning

confidence: 86%

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

et al. 2012

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nanotechnology, with its broad impact on societally relevant applications, relies heavily on the availability of accessible nanofabrication methods. Even though a host of such techniques exists, the flexible, inexpensive, on-demand and scalable fabrication of functional nanostructures remains largely elusive. Here we present a method involving nanoscale electrohydrodynamic ink-jet printing that may significantly contribute in this direction. A combination of nanoscopic placement precision, soft-landing fluid dynamics, rapid solvent vapourization, and subsequent self-assembly of the ink colloidal content leads to the formation of scaffolds with base diameters equal to that of a single ejected nanodroplet. The virtually material-independent growth of nanostructures into the third dimension is then governed by an autofocussing phenomenon caused by local electrostatic field enhancement, resulting in large aspect ratio. We demonstrate the capabilities of our electrohydrodynamic printing technique with several examples, including the fabrication of plasmonic nanoantennas with features sizes down to 50 nm.

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Section: Structure Growth By Electrostatic Nanodroplet Autofocussingmentioning

confidence: 86%

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

et al. 2012

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“…5,6 The near-field of the plasmonic structure can modify the emission of a fluorophore. [7][8][9][10][11][12] Depending on the plasmonic properties of the metallic nanoparticle (MNP) it can lead to quenching or enhancement of the fluorophore emission. The modified emission can be a consequence of many processes such as NRET to the MNP, scattering and absorption by the MNP, and changes in the emitter's radiative and nonradiative decay rates.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of the Distance Dependence of Localized Surface Plasmon Coupled Förster Resonance Energy Transfer

et al. 2014

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The distance dependence of localized surface plasmon (LSP) coupled Förster resonance energy transfer (FRET) is experimentally and theoretically investigated using a trilayer structure composed of separated monolayers of donor and acceptor quantum dots with an intermediate Au nanoparticle layer. The dependence of the energy transfer efficiency, rate, and characteristic distance, as well as the enhancement of the acceptor emission, on the separations between the three constituent layers is examined. A d –4 dependence of the energy transfer rate is observed for LSP-coupled FRET between the donor and acceptor planes with the increased energy transfer range described by an enhanced Förster radius. The conventional FRET rate also follows a d –4 dependence in this geometry. The conditions under which this distance dependence is valid for LSP-coupled FRET are theoretically investigated. The influence of the placement of the intermediate Au NP is investigated, and it is shown that donor–plasmon coupling has a greater influence on the characteristic energy transfer range in this LSP-coupled FRET system. The LSP-enhanced Förster radius is dependent on the Au nanoparticle concentration. The potential to tune the characteristic energy transfer distance has implications for applications in nanophotonic devices or sensors.

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“…12, 13 Fluorescence enhancement by plasmonic nanoparticles has been studied extensively over the past few decades. Early reports by the groups of Sandoghdar 14 and Novotny 15 employed a single gold nanosphere of 80 nm in diameter and achieved a fluorescence enhancement of a factor of 9. The fluorescence enhancement near gold nanospheres is modest because of the relatively small field enhancement (∼5 times).…”

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confidence: 99%

Resonant Plasmonic Enhancement of Single-Molecule Fluorescence by Individual Gold Nanorods

et al. 2014

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Enhancing the fluorescence of a weak emitter is important to further extend the reach of single-molecule fluorescence imaging to many unexplored systems. Here we study fluorescence enhancement by isolated gold nanorods and explore the role of the surface plasmon resonance (SPR) on the observed enhancements. Gold nanorods can be cheaply synthesized in large volumes, yet we find similar fluorescence enhancements as literature reports on lithographically fabricated nanoparticle assemblies. The fluorescence of a weak emitter, crystal violet, can be enhanced more than 1000-fold by a single nanorod with its SPR at 629 nm excited at 633 nm. This strong enhancement results from both an excitation rate enhancement of ∼130 and an effective emission enhancement of ∼9. The fluorescence enhancement, however, decreases sharply when the SPR wavelength moves away from the excitation laser wavelength or when the SPR has only a partial overlap with the emission spectrum of the fluorophore. The reported measurements of fluorescence enhancement by 11 nanorods with varying SPR wavelengths are consistent with numerical simulations.

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Enhancement of Single-Molecule Fluorescence Using a Gold Nanoparticle as an Optical Nanoantenna

Cited by 1,464 publications

References 25 publications

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

Direct printing of nanostructures by electrostatic autofocussing of ink nanodroplets

Experimental and Theoretical Investigation of the Distance Dependence of Localized Surface Plasmon Coupled Förster Resonance Energy Transfer

Resonant Plasmonic Enhancement of Single-Molecule Fluorescence by Individual Gold Nanorods

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