Computational study of fluorescence scattering by silver nanoparticles

Chowdhury, Mustafa H.; Gray, Stephen K.; Pond, James; Geddes, Chris D.; Aslan, Kadir; Lakowicz, Joseph R.

doi:10.1364/josab.24.002259

Cited by 47 publications

(70 citation statements)

References 27 publications

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“…At the end of the simulation, the various field components are checked to see if they decay to zero, thus indicating that the simulation has run for a sufficiently long time for the CW information obtained by Fourier transformations to be valid. 36,37 …”

Section: Methodsmentioning

confidence: 99%

Single-Molecule Spectroscopic Study of Enhanced Intrinsic Phycoerythrin Fluorescence on Silver Nanostructured Surfaces

Ray¹,

Chowdhury²,

Lakowicz³

2008

Anal. Chem.

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In this paper, we report on steady-state and time-resolved single-molecule fluorescence measurements performed on a phycobiliprotein, R-phycoerythrin (RPE), assembled on silver nanostructures. Single-molecule measurements clearly show that RPE molecules display a 10-fold increase in fluorescence intensity, with a 7-fold decrease in lifetime when they are assembled on silver nanostructured surfaces, as compared to control glass slides. The emission spectrum of individual RPE molecules also displays a significant fluorescence enhancement on silver nanostructures as compared to glass. From intensity and lifetime histograms, it is clear that the intensities as well as lifetimes of individual RPE molecules on silver nanostructures are more heterogeneously distributed than that on glass. This single-molecule study provides further insight on the heterogeneity in the fluorescence intensity and lifetimes of the RPE molecules on both glass and SiFs surfaces, which is otherwise not possible to observe using ensemble measurements. Finite-difference time-domain calculations have been performed to study the enhanced near-fields induced around silver nanoparticles by a radiating excited-state fluorophore, and the effect of such enhanced fields on the fluorescence enhancement observed is discussed.

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Section: Methodsmentioning

confidence: 99%

Single-Molecule Spectroscopic Study of Enhanced Intrinsic Phycoerythrin Fluorescence on Silver Nanostructured Surfaces

Ray¹,

Chowdhury²,

Lakowicz³

2008

Anal. Chem.

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“…This enhances the emission rate. 15,28,29 Therefore, it is again suggested that the distances between nanoparticles and fluorophores are as small as possible.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence enhancement in large-scale self-assembled gold nanoparticle double arrays

Chekini

Filter

Bierwagen

et al. 2015

Journal of Applied Physics

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Localized surface plasmon resonances excited in metallic nanoparticles confine and enhance electromagnetic fields at the nanoscale. This is particularly pronounced in dimers made from two closely spaced nanoparticles. When quantum emitters, such as dyes, are placed in the gap of those dimers, their absorption and emission characteristics can be modified. Both processes have to be considered when aiming to enhance the fluorescence from the quantum emitters. This is particularly challenging for dimers, since the electromagnetic properties and the enhanced fluorescence sensitively depend on the distance between the nanoparticles. Here, we use a layer-by-layer method to precisely control the distances in such systems. We consider a dye layer deposited on top of an array of gold nanoparticles or integrated into a central position of a double array of gold nanoparticles. We study the effect of the spatial arrangement and the average distance on the plasmon-enhanced fluorescence. We found a maximum of a 99-fold increase in the fluorescence intensity of the dye layer sandwiched between two gold nanoparticle arrays. The interaction of the dye layer with the plasmonic system also causes a spectral shift in the emission wavelengths and a shortening of the fluorescence life times. Our work paves the way for large-scale, high throughput, and low-cost self-assembled functionalized plasmonic systems that can be used as efficient light sources. V C 2015 AIP Publishing LLC. [http://dx

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“…This fact puts in evidence the importance of studying the interaction between DSs and PNs. Many articles have been devoted to the investigation of radiative and nonradiative decay rates and to the emission enhancement of molecules beside metallic nanoparticles numerically, theoretically, or experimentally [12][13][14][15][16][17][18][19][20][21]. Also, studies have reported on the near-field effect of molecules on metallic structures [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Critical excitation-rate enhancement of a dipolar scatterer close to a plasmonic nanosphere and importance of multipolar self-coupling

et al. 2014

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We develop an electrodynamic model based on dyadic Green's functions for analyzing the near-field interactions between a dipolar scatterer (DS) and a plasmonic nanosphere (PN) under external excitation, accounting for multipolar contributions in the evaluation of the scattered fields. In particular, we include all the radiative and nonradiative field interactions between the DS and the PN, particularly the physical mechanism of DS's self-coupling through the PN, which is either neglected or approximated in previous work. Our objective is to show under which conditions self-coupling is important for strong excitation-rate enhancement of the DS and provide a description of the system's properties. We analytically investigate the conditions under which the excitation rate of a DS, such as an organic dye or a quantum dot, is enhanced when located in close proximity to a PN. We show the existence of critical conditions in terms of polarizabilities and distances that lead to large enhancement based on self-coupling and how to predict it.

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Computational study of fluorescence scattering by silver nanoparticles

Cited by 47 publications

References 27 publications

Single-Molecule Spectroscopic Study of Enhanced Intrinsic Phycoerythrin Fluorescence on Silver Nanostructured Surfaces

Single-Molecule Spectroscopic Study of Enhanced Intrinsic Phycoerythrin Fluorescence on Silver Nanostructured Surfaces

Fluorescence enhancement in large-scale self-assembled gold nanoparticle double arrays

Critical excitation-rate enhancement of a dipolar scatterer close to a plasmonic nanosphere and importance of multipolar self-coupling

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