Effects of interband transitions on Faraday rotation in metallic nanoparticles

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dc.contributor.author Wysin, Gary M.
dc.contributor.author Chikan, Viktor
dc.contributor.author Young, Nathan
dc.contributor.author Dani, Raj Kumar
dc.date.accessioned 2013-09-27T20:50:16Z
dc.date.available 2013-09-27T20:50:16Z
dc.date.issued 2013-09-27
dc.identifier.uri http://hdl.handle.net/2097/16538
dc.description.abstract The Faraday rotation in metallic nanoparticles is considered based on a quantum model for the dielectric function epsilon(ω) in the presence of a DC magnetic field B. We focus on effects in epsilon(ω) due to interband transitions (IBTs), which are important in the blue and ultraviolet for noble metals used in plasmonics. The dielectric function is found using the perturbation of the electron density matrix due to the optical field of the incident electromagnetic radiation. The calculation is applied to transitions between two bands (d and p, for example) separated by a gap, as one finds in gold at the L-point of the Fermi surface. The result of the DC magnetic field is a shift in the effective optical frequency causing IBTs by ±μ[subscript B]B/ħ, where opposite signs are associated with left/right circular polarizations. The Faraday rotation for a dilute solution of 17 nm diameter gold nanoparticles is measured and compared with both the IBT theory and a simpler Drude model for the bound electron response. Effects of the plasmon resonance mode on Faraday rotation in nanoparticles are also discussed. en_US
dc.language.iso en_US en_US
dc.relation.uri http://iopscience.iop.org/0953-8984/25/32/325302/ en_US
dc.subject Quantum Faraday rotation en_US
dc.subject Dielectric function en_US
dc.subject Interband transitions en_US
dc.subject Nanoparticles en_US
dc.subject Plasmons en_US
dc.title Effects of interband transitions on Faraday rotation in metallic nanoparticles en_US
dc.type Article (author version) en_US
dc.date.published 2013 en_US
dc.citation.doi doi:10.1088/0953-8984/25/32/325302 en_US
dc.citation.issue 32 en_US
dc.citation.jtitle Journal of Physics: Condensed Matter en_US
dc.citation.spage 325302 en_US
dc.citation.volume 25 en_US
dc.contributor.authoreid wysin en_US
dc.contributor.authoreid chikan en_US

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