A Numerical Spectroscopic Investigation on the Functionality of Molecular Excitons in Tuning the Plasmonic Splitting Observed in Core/Shell Hybrid Nanostructures

Gülen, Demet

doi:10.1021/jp101658b

Cited by 14 publications

(11 citation statements)

References 33 publications

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“…As a result, the optical responses of both the molecules and metal nanocrystal are strongly modified, leading to distinct spectral changes on the hybrid nanostructure in comparison to the spectra of the separate constituents. Due to the great importance of plasmonic–molecular resonance coupling in both the fundamental understanding of light–matter interactions and practical technological applications, a large number of experimental − and theoretical − studies have been devoted to it. On the basis of these studies, many applications have been demonstrated, such as biological sensing , and imaging, , infrared detection, and all-optical switches .…”

Section: Introductionmentioning

confidence: 99%

Plasmonic–Molecular Resonance Coupling: Plasmonic Splitting versus Energy Transfer

et al. 2012

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Plasmonic–molecular resonance coupling was systematically studied using quasistatic approximation, Mie theory, and rigorous finite-difference time-domain calculations. The results indicate that the two types of coupling behaviors, plasmonic splitting and energy transfer, which are commonly manifested in experiments as peak splitting and a quenching dip, respectively, can be unified by considering a Au nanocrystal core coated with dye molecules. The dye coating is treated as a dielectric shell with Lorentzian-type absorption. By varying the oscillator strength and molecular transition line width, either plasmonic splitting or a quenching dip can be observed on the scattering spectrum of the dye-coated Au nanocrystal. The effects of the thickness of the dye coating, the spacing between the dye shell and the Au core, the partial dye coating, and the Au core shape on the coupled spectral shape were also ascertained. Our results will be useful for further exploring new phenomena in plasmon-based light–matter interactions as well as for developing highly selective and sensitive detection devices on the basis of plasmonic–molecular resonance coupling.

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Section: Introductionmentioning

confidence: 99%

Plasmonic–Molecular Resonance Coupling: Plasmonic Splitting versus Energy Transfer

et al. 2012

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“…1 Hybridization between plasmonic and molecular resonances can give rise to a variety of distinct optical properties which depend on the surface density and assembly behaviour of the dye adsorbed on the nanoparticle surface, the relative spectral overlap of both constituents as well as the distance between the dye layer and nanoparticle surface. A number of experimental [2][3][4][5][6][7][8][9][10][11] and theoretical [12][13][14] investigations have been recently reported characterising hybrid dye-metal nanoparticle structures. Of particular interest is the development of nanoparticle-enhanced spectroscopies including surface-enhanced Raman spectroscopy (SERS), 15 resonance energy transfer, 16 plasmon-enhanced fluorescence 17 and fluorescence quenching.…”

Section: Introductionmentioning

confidence: 99%

Stabilized gold nanorod–dye conjugates with controlled resonance coupling create bright surface-enhanced resonance Raman nanotags

McLintock

Lee

Wark

2013

Phys. Chem. Chem. Phys.

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The preparation and characterization of stable and non-aggregated colloidal suspensions of gold nanorod-molecular dye complexes which exhibit very bright surface-enhanced resonance Raman scattering (SERRS) signals is described. A systematic study was performed where both the localized surface plasmon resonance (LSPR) of the nanorod and the molecular resonance of dyes adsorbed onto the rod surface were selectively tuned with respect to the laser excitation wavelengths. Resonance coupling was found to be a significant factor in the overall SERRS enhancement. The polymer stabilized nanorod-dye conjugates were prepared without the added complexity of nanoparticle aggregation as well as having good control over the surface coverage and orientation of the dye molecules. Furthermore, we demonstrate that this new class of Raman nanotags greatly outperforms an approach based on quasi-spherical gold nanoparticles.

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“…Even more, for an optimized shell thickness and oscillator strength, the excitonic resonance has been shown to experience an effective band splitting induced by dielectric medium. This was confirmed by a series of numerical experiments carried out to investigate effective medium effects on the absorption of core–shell hybrid complexes …”

Section: The Geometries and Morphologies Of Plasmon–exciton Nanostrucmentioning

confidence: 60%

“…It should be noted that not only the depth or width of the dip is extremely sensitive to the changes in the environment, but the excitonic resonance itself should also sense the effective dielectric medium provided by the metal core and the embedding medium . Even more, for an optimized shell thickness and oscillator strength, the excitonic resonance has been shown to experience an effective band splitting induced by dielectric medium.…”

Section: The Geometries and Morphologies Of Plasmon–exciton Nanostrucmentioning

confidence: 99%

Induced Transparency in Plasmon–Exciton Nanostructures for Sensing Applications

Krivenkov

Goncharov

Nabiev

et al. 2018

Laser & Photonics Reviews

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The effect of induced transparency, which is related to photoinduced bleaching of photoabsorbers, is being intensely studied and has many applications in the field of sensing. Along with this classical effect, numerous studies on induced transparency in coupled plasmon-exciton systems, which is accompanied by the formation of hybrid states, have been recently published. The formation of a new coupled system results in various spectral modifications. For example, induced transparency manifests itself as a narrow dip in the absorption spectrum of a coupled system. This effect can be used in sensing, the feasibility of which is the main objective here, where a variety of materials and methods for obtaining the induced transparency are considered. Various morphologies and geometries of plasmonic nanoparticles are discussed as well as types of molecular absorbers to assess the most favorable combinations for the evolvement of induced transparency. The potential applications of the induced transparency effect in sensing and molecular diagnostics are summarized.As shown above, the IT effect is highly sensitive to several parameters of the composite system: the distance between the absorber and the plasmonic structure, their mutual arrangement, and the type and properties of the absorber itself. At the same time, the

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A Numerical Spectroscopic Investigation on the Functionality of Molecular Excitons in Tuning the Plasmonic Splitting Observed in Core/Shell Hybrid Nanostructures

Cited by 14 publications

References 33 publications

Plasmonic–Molecular Resonance Coupling: Plasmonic Splitting versus Energy Transfer

Plasmonic–Molecular Resonance Coupling: Plasmonic Splitting versus Energy Transfer

Stabilized gold nanorod–dye conjugates with controlled resonance coupling create bright surface-enhanced resonance Raman nanotags

Induced Transparency in Plasmon–Exciton Nanostructures for Sensing Applications

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