Gallium plasmonics: deep subwavelength spectroscopic imaging of single and interacting gallium nanoparticles.
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Gallium has recently been demonstrated as a phase-change plasmonic material offering UV tunability, facile synthesis, and a remarkable stability due to its thin, self-terminating native oxide. However, the dense irregular nanoparticle (NP) ensembles fabricated by molecular-beam epitaxy make optical measurements of individual particles challenging. Here we employ hyperspectral cathodoluminescence (CL) microscopy to characterize the response of single Ga NPs of various sizes within an irregular ensemble by spatially and spectrally resolving both in-plane and out-of-plane plasmonic modes. These modes, which include hybridized dipolar and higher-order terms due to phase retardation and substrate interactions, are correlated with finite difference time domain (FDTD) electrodynamics calculations that consider the Ga NP contact angle, substrate, and native Ga/Si surface oxidation. This study experimentally confirms previous theoretical predictions of plasmonic size-tunability in single Ga NPs and demonstrates that the plasmonic modes of interacting Ga nanoparticles can hybridize to produce strong hot spots in the ultraviolet. The controlled, robust UV plasmonic resonances of gallium nanoparticles are applicable to energy- and phase-specific applications such as optical memory, environmental remediation, and simultaneous fluorescence and surface-enhanced Raman spectroscopies.
Published Version (Please cite this version)10.1021/nn5072254
Publication InfoBrenny, BJM; Brown, April S; Coenen, T; Everitt, Henry; Knight, MW; Losurdo, M; ... Yang, Y (2015). Gallium plasmonics: deep subwavelength spectroscopic imaging of single and interacting gallium nanoparticles. ACS Nano, 9(2). pp. 2049-2060. 10.1021/nn5072254. Retrieved from http://hdl.handle.net/10161/13868.
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Professor of Electrical and Computer Engineering
Dr. April Brown recieved 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 Insitutute of Technology in 1994 as an Associate Professor and was promoted to Professor in 1999. She was Associate Dean in the College of Engi
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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