Fluorescence enhancement in hot spots of AFM-designed gold nanoparticle sandwiches

Date

2008-02-01

Author

Bek, Alpan
RINGLER, Moritz
MAYILO, Sergiy
KLAR, Thomas A.
FELDMANN, Jochen

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

13
views

0
downloads

We observe an enhancement of fluorescence from a single fluorescent sphere, which is sandwiched between two individual gold nanoparticles, forming a hot spot of strong field enhancement. The fluorescence enhancing hot spot is custom-designed by the deliberate assembly of gold nanoparticles with an atomic force microscope cantilever. The fluorescence intensity is monitored while the separation between the two gold nanoparticles is reduced by gradually pushing the gold nanoparticles closer to the fluorescent sphere. The fluorescence enhancement is maximal when the distance between the two gold nanoparticles is smallest, when the excitation polarization is parallel to the axis of the sandwich, and when the fluorescent sphere is positioned exactly on the axis connecting the two gold nanoparticles.

Subject Keywords

Atomic-force microscope, Raman-scattering, Silver electrode, Spontaneous emission, Surface, Molecule, Spectroscopy, Nanoantennas, Particles, Pyridine

URI

https://hdl.handle.net/11511/44798

Journal

NANO LETTERS

DOI

https://doi.org/10.1021/nl072602n

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Fluorescence excitation by enhanced plasmon upconversion under continuous wave illumination Taşgın, Mehmet Emre; Salakhutdinov, Ildar; Kendziora, Dania; Abak, Musa Kurtuluş; Turkpence, Deniz; Piantanida, Luca; Fruk, Ljiljana; Lazzarino, Marco; Bek, Alpan (Elsevier BV, 2016-09-01) We demonstrate effective background-free continuous wave nonlinear optical excitation of molecules that are sandwiched between asymmetrically constructed plasmonic gold nanoparticle clusters. We observe that near infrared photons are converted to visible photons through efficient plasmonic second harmonic generation. Our theoretical model and simulations demonstrate that Fano resonances may be responsible for being able to observe nonlinear conversion using a continuous wave light source. We show that nonli...
Fluorescence resonance energy transfer in recognition-mediated polymer-quantum dot assemblies Nandwana, Vikas; Fitzpatrick, Brian; Liu, Qian; Solntsev, Kyril M.; Yu, Xi; Tonga, Guelen Yesilbag; Eymur, Serkan; Tonga, Murat; Cooke, Graeme; Rotello, Vincent M. (2012-11-01) We have demonstrated fluorescence resonance energy transfer facilitated by recognition mediated assembly of quantum dots and a tailor-made fluorescent polymer.
Effect of particle properties and light polarization on the plasmonic resonances in metallic nanoparticles Guler, Urcan; Turan, Raşit (2010-08-02) The resonance behavior of localized surface plasmons in silver and gold nanoparticles was studied in the visible and near-infrared regions of the electromagnetic spectrum. Arrays of nano-sized gold (Au) and silver (Ag) particles with different properties were produced with electron-beam lithography technique over glass substrates. The effect of the particle size, shape variations, period, thickness, metal type, substrate type and sulfidation were studied via transmission and reflectance measurements. The re...
Manipulation of atoms across a surface at room temperature FİSHLOCK, T W; Oral, Ahmet; EGDELL, R G; PETHİCA, J B (2000-04-13) Since the realization that the tips of scanning probe microscopes can interact with atoms at surfaces, there has been much interest in the possibility of building or modifying nanostructures or molecules directly from single atoms(1). Individual large molecules can be positioned on surfaces(2-4), and atoms can be transferred controllably between the sample and probe tip(5,6). The most complex structures(7-11) are produced at cryogenic temperatures by sliding atoms across a surface to chosen sites. But there...
Effect of solvent refractive index on the surface plasmon resonance nanoparticle optical absorption Ertaş, Gülay (American Scientific Publishers, 2007-12-01) Optical properties of plasmon coupled silver and gold nanoparticles were studied as a function of the refractive index of the surrounding medium. Our studies confirmed that the effect of changes in the refractive index of the surrounding medium was more difficult to demonstrate from an experimental point of view, because of the very high susceptibility of nanoparticles to aggregate in aqueous and organic solvents. Whereas the position of the absorption bands of triiodide in these solvents shows a clear depe...

Citation Formats

A. Bek, M. RINGLER, S. MAYILO, T. A. KLAR, and J. FELDMANN, “Fluorescence enhancement in hot spots of AFM-designed gold nanoparticle sandwiches,” NANO LETTERS, pp. 485–490, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/44798.