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Gallium plasmonics: deep subwavelength spectroscopic imaging of single and interacting gallium nanoparticles.

dc.contributor.author Brenny, BJM
dc.contributor.author Brown, April S
dc.contributor.author Coenen, T
dc.contributor.author Everitt, Henry
dc.contributor.author Knight, MW
dc.contributor.author Losurdo, M
dc.contributor.author Polman, A
dc.contributor.author Yang, Y
dc.coverage.spatial United States
dc.date.accessioned 2017-03-19T00:50:37Z
dc.date.available 2017-03-19T00:50:37Z
dc.date.issued 2015-02-24
dc.identifier https://www.ncbi.nlm.nih.gov/pubmed/25629392
dc.identifier.uri http://hdl.handle.net/10161/13868
dc.description.abstract 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.
dc.language eng
dc.relation.ispartof ACS Nano
dc.relation.isversionof 10.1021/nn5072254
dc.subject cathodoluminescence
dc.subject dielectric function
dc.subject gallium
dc.subject hyperspectral
dc.subject nanoparticles
dc.subject plasmonics
dc.subject ultraviolet
dc.title Gallium plasmonics: deep subwavelength spectroscopic imaging of single and interacting gallium nanoparticles.
dc.type Journal article
pubs.author-url https://www.ncbi.nlm.nih.gov/pubmed/25629392
pubs.begin-page 2049
pubs.end-page 2060
pubs.issue 2
pubs.organisational-group Duke
pubs.organisational-group Electrical and Computer Engineering
pubs.organisational-group Physics
pubs.organisational-group Pratt School of Engineering
pubs.organisational-group Trinity College of Arts & Sciences
pubs.publication-status Published
pubs.volume 9
dc.identifier.eissn 1936-086X


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