1,517 research outputs found
ELECTRON-BEAM PATTERNING OF TEFLON AF FOR SURFACE PLASMON RESONANCE SENSING
Variable pressure electron beam etching and lithography for Teflon AF has been demonstrated. The relation between dose and etching depth is tested under high vacuum and water vapor. High resolution structures as small as 75 nm half-pitch have been resolved. Several simulation tools were tested for surface plasmon excitation. Grating based dual mode surface plasmon excitation has been shown numerically and experimentally
Surface Plasmon Excitation of Second Harmonic light: Emission and Absorption
We aim to clarify the role that absorption plays in nonlinear optical
processes in a variety of metallic nanostructures and show how it relates to
emission and conversion efficiency. We define a figure of merit that
establishes the structure's ability to either favor or impede second harmonic
generation. Our findings suggest that, despite the best efforts embarked upon
to enhance local fields and light coupling via plasmon excitation, nearly
always the absorbed harmonic energy far surpasses the harmonic energy emitted
in the far field. Qualitative and quantitative understanding of absorption
processes is crucial in the evaluation of practical designs of plasmonic
nanostructures for the purpose of frequency mixing
Fano-type interpretation of red shifts and red tails in hole array transmission spectra
We present a unifying point of view which allows to understand spectral
features reported in recent experiments with two-dimensional arrays of
subwavelength holes in metal films. We develop a Fano analysis of the related
scattering problem by distinguishing two interfering contributions to the
transmission process, namely a non-resonant contribution (direct scattering)
and a resonant contribution (surface plasmon excitation). The introduction of a
coupling strength between these two contributions naturally induces resonance
shifts and asymmetry of profiles which satisfy simple scaling relations. We
also report an experiment to confirm this analysis.Comment: 5 page
Plasmon excitation by charged particles interacting with metal surfaces
Recent experiments (R. A. Baragiola and C. A. Dukes, Phys. Rev. Lett. {\bf
76}, 2547 (1996)) with slow ions incident at grazing angle on metal surfaces
have shown that bulk plasmons are excited under conditions where the ions do
not penetrate the surface, contrary to the usual statement that probes exterior
to an electron gas do not couple to the bulk plasmon. We here use the quantized
hydrodynamic model of the bounded electron gas to derive an explicit expression
for the probability of bulk plasmon excitation by external charged particles
moving parallel to the surface. Our results indicate that for each
(the surface plasmon wave vector) there exists a continuum of bulk plasmon
excitations, which we also observe within the semi-classical infinite-barrier
(SCIB) model of the surface.Comment: 4 pages, 3 figures, o appear in Phys. Lett.
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