Results 191 to 200 of about 86,919 (242)

Fluorescent lifetimes of molecules on silver-island films

Optics Letters, 1982
The fluorescence of molecules on silver-island films exhibits nonexponential decay and is several orders of magnitude more rapid than on a silica surface, while the total emission intensity is slightly increased. This behavior results from the electromagnetic coupling between the fluorescing molecules and the plasmon resonances of the silver islands ...
D A, Weitz   +4 more
openaire   +4 more sources

Optical absorption resonances of dye-coated silver-island films

Optics Letters, 1981
We have used Mie theory to account for the features of the transmission spectra of dye-coated silver-island films. The unusual behavior of the spectra arises from the effect of the dispersion and damping of the optical response of the absorbing coating on the structural resonances of the silver islands. Our modeling indicates that the power dissipation
S, Garoff   +3 more
openaire   +4 more sources

Thickness-gradient dependent Raman enhancement in silver island films

Applied Physics Letters, 2009
We show evidence of a dependence of the enhancement of the Raman scattering cross section on the length of the gradient in graded silver island films. A factor-of-three increase in the Raman signal is observed for gradients with length of the order of 0.5 mm when compared to gradients of the order of 9 mm.
T. W. H. Oates, S. Noda
openaire   +3 more sources

Vacuum deposition of silver island films on chemically modified surfaces

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 2003
The silver island films were vacuum deposited at two different evaporation rates on unmodified indium tin oxide substrates and the substrates modified with molecules containing thiol, pyridyl, and fluorocarbon groups. The films were characterized by UV-visible spectroscopy and scanning electron microscopy.
Serhiy Z. Malynych, George Chumanov
openaire   +3 more sources

Near-Infrared Fluorescence Enhancement Using Silver Island Films

Plasmonics, 2006
Near-infrared (near-IR) excitation produces little background signal from biological molecules, making near- IR fluorescence technology highly useful in proteomic and genomic applications. To increase the emissions of near-IR fluorophores, we examined the use of metal-enhanced fluorescence on these longer wavelength dyes.
Jon P. Anderson   +2 more
openaire   +1 more source

Reduced intermolecular energy transfer on silver island films

Chemical Physics Letters, 1988
Abstract Radiationless energy transfer between high quantum efficiency donor and acceptor dye molecules is investigated for different distances between a silver island film and the dye laser by cw fluorescence spectroscopy. We observe reduced donor-acceptor energy transfer efficiency up to island-dye distances of 15 nm due to the enhanced radiative
A. Leitner, H. Reinisch
openaire   +1 more source

Singlet Oxygen Phosphorescence Enhancement by Silver Islands Films

The Journal of Physical Chemistry C, 2011
Optical detection of singlet oxygen, a reactive oxygen species that plays a crucial role in a variety of biomedical processes, is hampered by its extremely low emission probability. Using plasmonic effects induced in silver islands films coated with C60, we have been able to enhance the near-IR phosphorescence of singlet oxygen by a factor of ca.
Xavier Ragàs   +5 more
openaire   +1 more source

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