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Charge-transfer plasmons with narrow conductive molecular bridges: A quantum-classical theory
RAS, Kirensky Inst Phys Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia.;Fed Siberian Res Clin Ctr FMBA Russia, Krasnoyarsk 660037, Russia.;Siberian Fed Univ, Krasnoyarsk 660041, Russia..
Fed Siberian Res Clin Ctr FMBA Russia, Krasnoyarsk 660037, Russia.;Siberian Fed Univ, Krasnoyarsk 660041, Russia.;Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia..
RAS, Kirensky Inst Phys Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia.;Siberian Fed Univ, Krasnoyarsk 660041, Russia..
RAS, Kirensky Inst Phys Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia.;Siberian Fed Univ, Krasnoyarsk 660041, Russia..
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2019 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 151, no 24, article id 244125Article in journal (Refereed) Published
Abstract [en]

We analyze a new type of plasmon system arising from small metal nanoparticles linked by narrow conductive molecular bridges. In contrast to the well-known charge-transfer plasmons, the bridge in these systems consists only of a narrow conductive molecule or polymer in which the electrons move in a ballistic mode, showing quantum effects. The plasmonic system is studied by an original hybrid quantum-classical model accounting for the quantum effects, with the main parameters obtained from first-principles density functional theory simulations. We have derived a general analytical expression for the modified frequency of the plasmons and have shown that its frequency lies in the near-infrared (IR) region and strongly depends on the conductivity of the molecule, on the nanoparticle-molecule interface, and on the size of the system. As illustrated, we explored the plasmons in a system consisting of two small gold nanoparticles linked by a conjugated polyacetylene molecule terminated by sulfur atoms. It is argued that applications of this novel type of plasmon may have wide ramifications in the areas of chemical sensing and IR deep tissue imaging. Published under license by AIP Publishing.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2019. Vol. 151, no 24, article id 244125
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Physical Sciences
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URN: urn:nbn:se:kth:diva-269501DOI: 10.1063/1.5131734ISI: 000513160200031PubMedID: 31893913Scopus ID: 2-s2.0-85077389669OAI: oai:DiVA.org:kth-269501DiVA, id: diva2:1412861
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QC 20200309

Available from: 2020-03-09 Created: 2020-03-09 Last updated: 2020-03-09Bibliographically approved

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Ågren, Hans

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