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Plasmonic and Photonic Modes in Colloidal CuS Nanocrystals

Kenan Elibol, Fatemeh Davoodi, Urvi Parekh, Masoud Taleb, Stefan Scheel Orcid Logo, Marko Burghard, Peter A. van Aken, Christian Klinke, Nahid Talebi, Rostyslav Lesyuk Orcid Logo

Advanced Optical Materials, Volume: 13, Issue: 12

Swansea University Author: Christian Klinke

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DOI (Published version): 10.1002/adom.202402965

Abstract

Copper monosulfide (CuS), also known as covellite, displays exceptional optoelectronic characteristics, exhibiting both plasmonic and photonic absorption in its monolithic nanomaterial form. It is classified as a hybrid metallic-semiconducting material and a natural hyperbolic material with a distin...

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Published in: Advanced Optical Materials
ISSN: 2195-1071 2195-1071
Published: Wiley 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa69414
Abstract: Copper monosulfide (CuS), also known as covellite, displays exceptional optoelectronic characteristics, exhibiting both plasmonic and photonic absorption in its monolithic nanomaterial form. It is classified as a hybrid metallic-semiconducting material and a natural hyperbolic material with a distinctive crystal structure. Nanostructured CuS has been demonstrated to support localized surface plasmon resonances (LSPR) in the near-infrared spectral range. Here, the phenomenon of near-infrared (NIR) to visible electromagnetic field localization in ultrathin crystalline quasi-2D CuS nanocrystals is revealed. This is achieved by mapping LSPRs in a range of CuS structures using high-resolution electron energy-loss spectroscopy in combination with cathodoluminescence spectroscopy. In addition to LSPRs, a range of photonic modes in the visible and ultraviolet spectral ranges is identified in colloidally defined single-crystalline nanostructures, with numerical simulations providing supporting evidence. Finally, CuS nanocrystals exhibit visible NIR light emission within the range of 600–900 nm when excited by an electron beam. Altogether, these properties make CuS nanocrystals highly suitable for applications in telecommunications, sensing, and nanophotonics.
Keywords: cathodoluminescence, copper sulfide, covellite, EELS mapping, nanocrys-tal, photonic mode, plasmonic mode
College: Faculty of Science and Engineering
Funders: European Union for the funding of the PL spectrometer. Grant Number: GHS-20-0035/P000376218 Deutsche Forschungsgemeinschaft. Grant Numbers: 525347396, 441234705 European Research Council (ERC) Research and Innovation Programme. Grant Numbers: 802130, 101157312, 101017720 European Regional Development Fund. Grant Number: GHS-20-0036/P000379642 Volkswagen Foundation
Issue: 12

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