Ultraviolet-Visible Plasmonic Properties of Gallium Nanoparticles Investigated by Variable-Angle Spectroscopic and Mueller Matrix Ellipsometry
Abstract
© 2014 American Chemical Society.Self-assembled, irregular ensembles of hemispherical
Ga nanoparticles (NPs) were deposited on sapphire by molecular beam epitaxy. These
samples, whose constituent unimodal or bimodal distribution of NP sizes was controlled
by deposition time, exhibited localized surface plasmon resonances tunable from the
ultraviolet to the visible (UV/vis) spectral range. The optical response of each sample
was characterized using a variable-angle spectroscopic ellipsometer, and the dielectric
response of the ensemble of NPs on each sample was parametrized using Lorentz oscillators.
From this, a relationship was found between NP size and the deduced Lorentzian parameters
(resonant frequency, damping, oscillator strength) for most unimodal and bimodal samples
at most frequencies and angles of incidence. However, for samples with a bimodal size
distribution, Mueller matrix ellipsometry revealed nonspecular scattering at particular
frequencies and angles, suggesting a resonant interparticle coupling effect consistent
with recently observed strong local field enhancements in the ultraviolet. (Graph
presented).
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https://hdl.handle.net/10161/13863Published Version (Please cite this version)
10.1021/ph500042vPublication Info
(2014). Ultraviolet-Visible Plasmonic Properties of Gallium Nanoparticles Investigated by
Variable-Angle Spectroscopic and Mueller Matrix Ellipsometry. ACS Photonics, 1(7). pp. 582-589. 10.1021/ph500042v. Retrieved from https://hdl.handle.net/10161/13863.This is constructed from limited available data and may be imprecise. To cite this
article, please review & use the official citation provided by the journal.
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Show full item recordScholars@Duke
April S. Brown
Professor of Electrical and Computer Engineering
Dr. April Brown received her B.S.E.E. from North Carolina State University in 1981,
her M.S.E.E. and Ph.D. from Cornell University in 1984 and 1985, respectively. She
worked at the Hughes Research Laboratories (now HRL LLC) in Malibu, Ca. from 1986-1993,
and spent one year at the Army Research Office in the Physics Division (1988). She
joined the Georgia Institute of Technology in 1994 as an Associate Professor and was
promoted to Professor in 1999. She was Associate Dean in the College of Engin
Henry Everitt
Adjunct Professor of Physics
Dr. Everitt is one of the Army's chief scientists. He works at the Army's Aviation
and Missile RD&E Center at Redstone Arsenal, AL. Through his adjunct appointment in
the Duke Physics Department, he leads an active experimental research group in condensed
matter physics, nanophotonics, molecular physics, and novel terahertz imaging with
colleagues on campus and through an international network of collaborators. Four
principal research areas are being pursued:
1) Ultrafast Spectroscopy.
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