Low-threshold lasing and broad-band multiphoton-excited light emission from Ag aggregate-adsorbate complexes in microcavity

Drachev, Vladimir P.; Kim, Won‐Tae; Safonov, V. P.; Podolskiy, Viktor A.; Zakovryashin, Nikolai; Khaliullin, Eldar N.; Shalaev, Vladimir M.; Armstrong, R. L.

doi:10.1080/09500340110087246

Cited by 23 publications

(10 citation statements)

References 39 publications

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“…Because of the relatively small sizes of the clusters of silver nanoparticles used in our experiments, the fractal dimension of the aggregate was difficult to estimate directly. It is known that aggregates of silver nanoparticles usually have a fractal dimension of 1.7-1.8 [11]. (As was shown by many groups [12], the fractal dimension can be introduced even for small clusters provided that there is a very large ensemble of clusters.…”

Section: Experimental Samples and Set-upmentioning

confidence: 99%

Spectroscopic studies of liquid solutions of R6G laser dye and Ag nanoparticle aggregates

Noginov

Vondrova

Williams

et al. 2005

J. Opt. A: Pure Appl. Opt.

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We have found that R6G laser dye in a concentration of 0.1 g l −1 mixed with a solution of aggregated silver nanoparticles exhibits a new emission band with a maximum at 612 nm. This band does not exist in pure dye of comparable concentration or in a mixture of dye with a solution of single silver nanoparticles. A qualitatively similar red-shifted emission band is observed in pure R6G dye at very high concentration (3.8 or 16.7 g l −1). In both cases, no changes occur to the shapes of the absorption spectra of the dye. We explain the observed spectral changes in terms of J-aggregates of R6G molecules whose formation is probable in the presence of Ag aggregates with a complicated surface structure and is much less likely in the case of adsorption of dye molecules on single Ag nanoparticles. Alternatively, many features observed in the experiment can be explained by an enhancement of the rates of spontaneous radiative transitions in the proximity of metallic particles, which is due to a modification of the local density of electromagnetic modes in the vicinity of metal surfaces at energies resonant with surface plasmon resonances.

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Section: Experimental Samples and Set-upmentioning

confidence: 99%

Spectroscopic studies of liquid solutions of R6G laser dye and Ag nanoparticle aggregates

Noginov

Vondrova

Williams

et al. 2005

J. Opt. A: Pure Appl. Opt.

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“…When the frequency of the illuminating field is close to the frequency of the system dipolar eigenmodes, a strong scattering enhancement is observed. Several experiments were carried out on clustered metal NPs , on which reference dyes were adsorbed. , The enhancement was attributed to the strong amplification of the electromagnetic (EM) field produced by the excitation of the localized plasmon resonance modes corresponding to the metallic nanostructure. The magnitude of the observed enhancement depends on several factors including the NP size and shape as well as the features of the resulting aggregate, namely, the particle spatial density and mutual spacing.…”

Section: Introductionmentioning

confidence: 99%

Light Scattering Enhancement in Nanostructured Silver Film Composites

et al. 2013

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We experimentally investigated the extinction properties of thin silver films. The films consisted of arrays of nanoparticles deposited by pulsed laser ablation on a dielectric substrate, thus resulting in a composite system. Adopting a set of deposition parameter values, we obtained different and controlled morphologies, from isolated to increasingly clustered nanoparticles. We found that, in analogy with nanostructured particle composites, the dipolar moments of different nanoparticle clusters are coupled, giving rise to a local electromagnetic enhancement. The imaginary part of the polarizability of the system obeys scaling laws, the optical spectral dimension d 0 being 0.3.

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“…We demonstrate that the light-harvesting efficiency of chlorophyll can be greatly increased via a plasmon-enhanced anti-Stokes process involving simultaneous absorption of a low-energy photon and a characteristic phonon mode of the chlorophyll molecules5051. The nanosystem used in our study is illustrated in Fig.…”

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confidence: 98%

Plasmon-Enhanced Light Harvesting of Chlorophylls on Near-Percolating Silver Films via One-Photon Anti-Stokes Upconversion

Wang

Nan

Liu

et al. 2013

Sci Rep

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There exists a wealth of means of efficient utilization of solar energy in nature, with photosynthesis of chlorophylls as a prime example. Separately, artificially structured plasmonic materials are versatile in light harvesting and energy conversion. Using a simple and scalable design of near-percolating silver nanostructures, we demonstrate that the light-harvesting efficiency of chlorophylls can be drastically enhanced by tuning the plasmon frequency of the constituent silver nanoparticles to coincide with the maximal photon flux of sunlight. In particular, we show that the photon upconversion efficiency can be readily enhanced by over 20 folds, with the room-temperature fluorescence quantum yield increased by a factor of 2.63. The underlying mechanism for the upconversion enhancement is attributed to a one-electron-per-photon anti-Stokes process, involving absorption of a characteristic phonon mode of the chlorophylls. These findings suggest that chlorophylls can serve as molecular building blocks for high-efficiency light harvesting and solar energy conversion.

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Low-threshold lasing and broad-band multiphoton-excited light emission from Ag aggregate-adsorbate complexes in microcavity

Cited by 23 publications

References 39 publications

Spectroscopic studies of liquid solutions of R6G laser dye and Ag nanoparticle aggregates

Spectroscopic studies of liquid solutions of R6G laser dye and Ag nanoparticle aggregates

Light Scattering Enhancement in Nanostructured Silver Film Composites

Plasmon-Enhanced Light Harvesting of Chlorophylls on Near-Percolating Silver Films via One-Photon Anti-Stokes Upconversion

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