Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

Damm, Signe; Fedele, Stefano; Murphy, Antony; Holsgrove, Kristina; Arredondo, Miryam; Pollard, Robert; Barry, James N.; Dowling, Denis P.; Rice, James H.

doi:10.1063/1.4919968

Cited by 32 publications

(28 citation statements)

References 38 publications

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“…J-aggregate samples were prepared using meso-tetra (n-methyl-4-pyridyl) porphyrine tetra chloride (Frontier scientific) at pH=1 inducing J-aggregate formation by drop deposition as per reported procedures [19][20][21]. Reflection spectra from the nanorod array were measured in TE and TM polarizations and showed two broad bands associated with transverse and longitudinal modes from the nanorod array which are in line with literature reports (as shown in Figure 1(b)) [3,4,18]. Reflection spectra were recorded for the J-aggregate/nanorod sample as a function of (ΔR/R = (R sample − R background )/R background ) using a gold mirror background reference.…”

Section: Papersupporting

confidence: 70%

“…SEM studies (using a Jeol 6500F field emission SEM) reported that the Au nanorod substrate possesses a 70 ± 11 nm array period (center to center distance), a rod diameter 35 nm ± 7 and rod height of 200 ± 25 nm. The nanorods are encased in an anodic aluminum oxide (AAO) template which was removed prior to sample preparation via an etching solution in 30 mM NaOH as reported previously [3,4,18]. J-aggregate samples were prepared using meso-tetra (n-methyl-4-pyridyl) porphyrine tetra chloride (Frontier scientific) at pH=1 inducing J-aggregate formation by drop deposition as per reported procedures [19][20][21].…”

Section: Papermentioning

confidence: 99%

“…Developments in top-down and bottom-up nanofabrication techniques have enabled the development of active plasmonic nanomaterials such as arrays of gold nanorods with size-and shape-tunable plasmonic resonances [1][2][3][4]. Active plasmonics nanomaterials can be coupled with excitonic systems to give rise to hybrid plasmon-exciton modes (Plexcitons) when in the strong coupling regime [5][6][7][8].…”

Section: Papermentioning

confidence: 99%

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Strong coupling in molecular exciton-plasmon Au nanorod array systems

et al. 2016

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We demonstrate here strong coupling between localized surface plasmon modes in self-standing nanorods with excitons in a molecular J-aggregate layer though angular tuning. The enhanced exciton−plasmon coupling creates a Fano like line shape in the differential reflection spectra associated with the formation of hybrid states, leading to anti-crossing of the upper and lower polaritons with a Rabi frequency of 125 meV. The recreation of a Fano like line shape was found in photoluminescence demonstrating changes in the emission spectral profile under strong coupling. PaperDevelopments in top-down and bottom-up nanofabrication techniques have enabled the development of active plasmonic nanomaterials such as arrays of gold nanorods with size-and shape-tunable plasmonic resonances [1][2][3][4]. Active plasmonics nanomaterials can be coupled with excitonic systems to give rise to hybrid plasmon-exciton modes (Plexcitons) when in the strong coupling regime [5][6][7][8]. Such systems when within the strong coupling limit effect changes in the optical processes of an emitter or absorber excitonic system. This offers potential to enhance or control exciton processes in excitonic systems such as organic semiconductors which offers opportunities for enhanced photonic device designs such as in light harvesting, optical sensing or artificial light sources [1,9,10]. An understanding of light mater interactions of plasmon-exciton complexes is central in fully realizing the potential of such complexes.A number of studies have demonstrated plasmon-exciton in the strong coupling limit between an organic exciton semiconductor and a surface plasmons [11,12] and localized surface plasmons geometries [13][14][15][16][17]. Studies have demonstrated that colloidal Au nanoshell-J-aggregate particles exhibit strong coupling between the localized plasmons of a nanoshell and the excitons of molecular J-aggregates adsorbed on its surface [13]. The interaction of an organic exciton in a J-aggregate and surface plasmon polariton modes of nanostructured hole arrays or of nanosize metallic disks with different array periods was reported to exhibit strong coupling [14][15][16]. Tuning of plasmon-exciton coupling strength has been reported for strongly coupled exciton-plasmon states in Au nanodisk arrays coated with J-aggregate molecules achieved by changing the incident angle of incoming light, rather than changing the geometry 2 of the plasmonic nanomaterial. Using such an angle resolved approach plasmon-exciton coupling of variable strengths was achieved [17].Strong coupling between plasmons on oriented gold nanorods arrays and J-aggregate molecular exciton has been demonstrated using a series of arrays with different architectures to control the spatial and spectral overlap between the plasmonic structure and exciton molecular aggregates [18]. Here we demonstrate tuning/detuning of strong coupling in self-standing nanorod arrays achieved though angular tuning. We report a Fano line shape in the differential reflection spectra associated...

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Section: Papersupporting

confidence: 70%

Section: Papermentioning

confidence: 99%

Section: Papermentioning

confidence: 99%

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Strong coupling in molecular exciton-plasmon Au nanorod array systems

et al. 2016

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“…One route to enhance the Raman signal is to use plasmon‐active nanomaterials in order to detect a highly specific chemical fingerprint for a wide range of analyte molecules . Such an approach is often referred to as surface‐enhanced Raman scattering (SERS), with typical enhancement factors of ~10 8 –10 10 . The ability of SERS to detect analytes (down to the single‐molecule level SERS) benefits significantly from the formation of regions with high electromagnetic field intensities (“hot spots”) such as a nanoscale (<10 nm) junction between two metal NPs .…”

Section: Introductionmentioning

confidence: 99%

Aligned diphenylalanine nanotube–silver nanoparticle templates for high‐sensitivity surface‐enhanced Raman scattering

Almohammed

Fedele

Rodriguez

et al. 2017

J Raman Spectroscopy

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Self‐assembly offers potential routes for large‐scale, rapid, and cost‐effective surface‐enhanced Raman scattering (SERS) substrate designs. Here, a highly sensitive SERS template is reported, which utilizes aligned diphenylalanine nanotubes to form a dense packing arrangement of plasmon‐active silver nanoparticles. The template is stable under high laser illumination with a power density of ~6.25 MW/cm2 in comparison to only silver nanoparticles and enables picomolar and femtomolar probe molecule concentrations to be probed, indicative of single‐molecule SERS detection.

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“…12,16,19,21,26,30 Therefore, it is essential to control the distance between the fluorophores and the particles surface. 12,14,16,19,21,26,31 In order to achieve such distance control, the use of different types of spacers has been reported such as silica, 22,24,[32][33][34][35] polymers, 7,19,21,[36][37][38][39] and biomolecules. 28,[40][41][42] However, one important factor is yet unconsidered.…”

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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Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

Cited by 32 publications

References 38 publications

Strong coupling in molecular exciton-plasmon Au nanorod array systems

Strong coupling in molecular exciton-plasmon Au nanorod array systems

Aligned diphenylalanine nanotube–silver nanoparticle templates for high‐sensitivity surface‐enhanced Raman scattering

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

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