Ultraviolet-Visible Plasmonic Properties of Gallium Nanoparticles Investigated by Variable-Angle Spectroscopic and Mueller Matrix Ellipsometry
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2014-07-16
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© 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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Yang, Y, N Akozbek, TH Kim, JM Sanz, F Moreno, M Losurdo, AS Brown, HO Everitt, et al. (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.
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April S. Brown
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 Engineering from 1999-2001 and Executive Assistant to the President from 2001-2002. In addition, she was named Pettit Professor in Microelectronics in 2001. She joined Duke University as Professor and Chair in July 2002.
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