Showing papers by "Franz R. Aussenegg published in 2003"
TL;DR: In this paper, surface plasmon excitation in pairs of identical Au nanoparticles by optical transmission spectroscopy was studied and it was shown that with decreasing interparticle distance the surface plasm resonance shifts to longer wavelengths for a polarization direction parallel to the long particle pair axis whereas a blueshift is found for the orthogonal polarization.
1,432 citations
TL;DR: In this article, the maximum of the surface plasmon resonance of elongated gold nanoparticles to a wavelength, the position of which is precisely midway between the exciting laser line and the Raman line, was used to optimize the surface-enhanced Raman scattering effect.
Abstract: In this letter, we show that tuning the maximum of the surface plasmon resonance of elongated gold nanoparticles to a wavelength, the position of which is precisely midway between the exciting laser line and the Raman line, results in an optimization of the surface-enhanced Raman-scattering effect.
417 citations
TL;DR: In this paper, surface plasmon modes on silver and gold nanowires of a fixed cross section and different lengths, produced by electron beam lithography were determined by extinction spectroscopy and can be interpreted in terms of standing Plasmon polariton waves.
Abstract: We have studied surface plasmon modes on silver and gold nanowires of a fixed cross section and different lengths, produced by electron beam lithography. The optically excited modes are determined by extinction spectroscopy and can be interpreted in terms of standing plasmon polariton waves. The eigenfrequencies are found to follow a dispersion relation similar to that for a planar metal/dielectric interface.
301 citations
TL;DR: The experimental realization of key elements of a two‐dimensional optics based on surface plasmon polaritons (SPPs) were achieved by detecting the fluorescence of molecules that act as local probes of the SPP near‐field intensity.
Abstract: We report the experimental realization of key elements of a two-dimensional optics based on surface plasmon polaritons (SPPs). Local SPP sources, Bragg mirrors and beamsplitters were lithographically built from silver nanostructures. The SPP fields were imaged by detecting the fluorescence of molecules that act as local probes of the SPP near-field intensity.
107 citations
TL;DR: In this article, the local coupling efficiency of a strongly focused laser beam to surface plasmon polaritons on a gold thin film was investigated and the coupling was mediated by gold ridges with nanoscale cross section.
Abstract: We investigate quantitatively the local coupling efficiency of a strongly focused laser beam to surface plasmon polaritons on a gold thin film. The coupling is mediated by gold ridges with nanoscale cross section. The coupling efficiency is determined by measuring the leakage radiation emitted by the surface plasmon polaritons into the glass substrate supporting the thin film.
102 citations
TL;DR: It is shown how the standing-wave picture provides a useful conceptual framework to understand and exploit such systems as well as a method-of-moments calculational scheme that provides simulations in good quantitative agreement with the data.
Abstract: The transmission of light along the surface normal through an air-quartz-glass interface covered with a periodic array of thin, rectangular gold patches has been studied over the visible to infrared range. The various structures that are observed can be qualitatively understood as arising from standing-wave resonances set by the size and surroundings of the metal patches. A method-of-moments calculational scheme provides simulations in good quantitative agreement with the data. It is shown how the standing-wave picture provides a useful conceptual framework to understand and exploit such systems.
40 citations
18 Nov 2003
TL;DR: In this paper, the optical excitation of plasmon modes in elongated gold nanoparticles was investigated and it was shown that higher-order modes can be excited as well.
Abstract: We report on the optical excitation of plasmon modes in elongated gold nanoparticles. Beside dipolar plasmon modes higher order plasmon modes can be excited. As has been reported recently for elongated silver nanoparticles (Krenn et al ., Appl.Phys.Lett 77 , 3379 (2000)) this geometry gives rise to narrow extinction bands that are spectrally well separated.