Granular metal films on the surfaces of transparent dielectric materials studied and modified via optical means

Vartanyan, T. A.; Леонов, Н. Б.; Khromov, V. V.; Przhibel’skiĭ, S. G.; Toropov, N. A.; Kaliteevskaya, E. N.

doi:10.1117/12.923123

Cited by 12 publications

(5 citation statements)

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“…The MCC layers with silver NPs were irradiated by laser pulses of the 8.4 mJ/cm 2 fluence. This value is well below the threshold of laser-induced modifications of silver nanoparticles determined in the spectral hole burning experiment. ,− …”

Section: Resultsmentioning

confidence: 71%

Aggregation of Cyanine Dye Molecules in the Near Fields of Plasmonic Nanoparticles Excited by Pulsed Laser Irradiation

2014

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Influence of laser irradiation on the supramolecular structure of thin organic dye layers is shown to depend on the presence of metal nanoparticles supporting localized surface plasmon resonance. Silver nanoparticles with the average size of 13 nm were produced on the sapphire substrate via physical vapor deposition under UHV conditions. The thus obtained granular silver film was spin-coated by monocarbocyanine dye. The samples were characterized by vis-NIR spectroscopy, SEM, and AFM. It is established that in the presence of silver nanoparticles pulsed laser irradiation at the wavelength of 532 nm leads to an increase of the relative concentration of the J-aggregates of the monocarbocyanine dye molecules, while on the bare sapphire substrate only the destruction of the dye molecules was observed.

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Section: Resultsmentioning

confidence: 71%

Aggregation of Cyanine Dye Molecules in the Near Fields of Plasmonic Nanoparticles Excited by Pulsed Laser Irradiation

2014

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“…At the same time, for many applications such an intrinsic property of LSPR as its dephasing time plays a crucial role. For this reason, it is intensively studied . It is well known that plasmonic oscillations are damped out due to both radiative and non‐radiative processes.…”

Section: Introductionmentioning

confidence: 99%

Influence of Silver Nanoparticles Crystallinity on Localized Surface Plasmons Dephasing Times

Toropov

Леонов

Vartanyan

2017

Physica Status Solidi (b)

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The dephasing time of localized surface plasmons is a crucial parameter that defines the quality of resonance and achievable electromagnetic field enhancement near metal nanoparticles. Lattice irregularities of as‐deposited supported metal nanoparticles shorten the plasmon dephasing time and degrade the resonance quality. To study the crystallinity influence on the plasmon dephasing time in more detail, silver nanoparticles in the form of a granular film were produced on dielectric substrates via physical vapor deposition in a vacuum chamber. The samples are characterized using Vis–NIR spectroscopy and transmission electron microscopy. The persistent spectral hole burning technique is applied to study the annealing influence on the dephasing time of localized surface plasmons of the particular resonance frequency. After annealing, the improved crystallinity of nanoparticles leads to a twofold dephasing time increase. This conclusion is supported by the electron diffraction patterns. The role of the improved crystallinity among concurrent effects of annealing is discussed.

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“…The amount of silver was equivalent to 5 nm thick continuous layer. The morphology of these samples was characterized by SEM 11 . The Ag nanoparticles were up to 30 nm in average size.…”

Section: Rhodaminementioning

confidence: 99%

Organic-inorganic planar hybrid materials for spasers

2015

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We strive to obtain highly fluorescent planar materials that may be used for the development of nanolasers based on localized plasmons. The promissing candidates for this purpose are materials consisting of mixtures of organic molecules, polymer, and silver nanoparticles. Silver nanoparticles were preliminary deposited on the quartz substrates. These samples were characterized by SEM and absorption spectroscopy. Then, they were covered by the polymer/rhodamine and polymer/coumarin layers using either spin-coating or evaporation techniques and characterized by confocal luminescent microscopy and spectroscopy. As a result of the localized surface plasmon excitation, we observed the enhancement of the rhodamine and coumarine absorption in the near fields of silver nanoparticles. The fluorescence of the thin films of polymer activated by dyes molecules with silver nanoparticles was almost 20-fold more intense than that on the bare dielectric surfaces without silver nanoparticles. In the presence Ag nanoparticles and at increased intensities of excitation we found also slight narrowing of the luminescence spectrum of polymer/coumarin layers.

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Granular metal films on the surfaces of transparent dielectric materials studied and modified via optical means

Cited by 12 publications

References 0 publications

Aggregation of Cyanine Dye Molecules in the Near Fields of Plasmonic Nanoparticles Excited by Pulsed Laser Irradiation

Aggregation of Cyanine Dye Molecules in the Near Fields of Plasmonic Nanoparticles Excited by Pulsed Laser Irradiation

Influence of Silver Nanoparticles Crystallinity on Localized Surface Plasmons Dephasing Times

Organic-inorganic planar hybrid materials for spasers

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