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Nanoscale Mapping and Defect-Assisted Manipulation of Surface Plasmon Resonances in 2D Bi2Te3/Sb2Te3 In-Plane Heterostructures
Department of Materials Science and Engineering, Materials Research Institute, The Pennsylvania State University, PA, University Park, United States.
Department of Chemistry, University of Washington, WA, Seattle, United States.
Umeå University, Faculty of Science and Technology, Department of Physics. Department of Materials Science and Nano Engineering, Rice University, TX, Houston, United States.
SLAC National Accelerator Laboratory, CA, Menlo Park, United States.
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2022 (English)In: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 10, no 10, article id 2101968Article in journal (Refereed) Published
Abstract [en]

The Bi2Te3/Sb2Te3 in-plane heterostructure is reported as a low-dimensional tunable chalcogenide well suited as plasmonic building block for the visible−UV spectral range. Electron-driven plasmon excitations of low-dimensional Bi2Te3/Sb2Te3 are investigated by monochromated electron energy loss spectroscopy spectrum imaging. To resolve the nanoscale spatial distribution of various local plasmonic resonances, singular value decomposition is used to disentangle the spectral data and identify the individual spectral contributions of various corner, edge, and face modes. Furthermore, defect-plasmon interactions are investigated both for nanoscale intrinsic and thermally induced extrinsic polygonal defects (in situ sublimation). Signature of defect-induced red shift ranging from a several hundreds of millielectronvolts to a few electronvolts, broadening of various plasmon response, together with selective enhancement and significant variations in their intensity are detected. This study highlights the presence of a heterointerface and identifies defects as physical tuning pathways to modulate the plasmonic response over a broad spectral range. Finally, the experimental observations are compared qualitatively and validated with numerical simulations using the electron-driven discrete dipole approximation. Low-dimensional Bi2Te3/Sb2Te3 as a less explored plasmonic system holds great promises as emerging platform for integrated plasmonics. Furthermore, introducing controlled structural defects can open the door for nanoengineering of plasmonic properties in such systems.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022. Vol. 10, no 10, article id 2101968
Keywords [en]
Bi 2Te 3/Sb 2Te 3, defect-plasmon interaction, electron-driven discrete dipole approximation (e-DDA), low-dimensional tunable chalcogenides, monochromated electron energy loss spectroscopy (Mono-EELS), singular value decomposition (SVD), surface plasmon resonance
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-193589DOI: 10.1002/adom.202101968ISI: 000772484500001Scopus ID: 2-s2.0-85126983480OAI: oai:DiVA.org:umu-193589DiVA, id: diva2:1652336
Funder
Swedish Research Council, 2015-06462
Note

This article also appears in Hot Topic: Surfaces and Interfaces.

Available from: 2022-04-19 Created: 2022-04-19 Last updated: 2022-07-13Bibliographically approved

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Sharifi, Tiva

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