Enhanced optical nonlinearity in suspensions of dual-resonance gold–copper chalcogenide core–shell nanoparticles

Plasmonic copper chalcogenide (Cu2−xE, E = S, Se, Te) nanoparticles (NPs) possess high potentials in photothermal therapy and photoacoustic tomography for their unique localized surface plasmon resonant absorption in the second near-infrared biologically transparent window. In this study, strong the...

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Veröffentlicht in:	Applied physics letters 2024-10, Vol.125 (17)
Hauptverfasser:	Ning, Dongling, Lin, Xinyu, Ren, Yu-Xuan, Liang, Yi, Lin, Tao
Format:	Artikel
Sprache:	eng
Schlagworte:	Absorptivity Biomedical materials Chalcogenides Copper Core-shell particles Nanoparticles Near infrared radiation Nonlinear optics Nonlinear systems Nonlinearity Photoacoustic effect Plasmonics Surface plasmon resonance
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creator	Ning, Dongling Lin, Xinyu Ren, Yu-Xuan Liang, Yi Lin, Tao
description	Plasmonic copper chalcogenide (Cu2−xE, E = S, Se, Te) nanoparticles (NPs) possess high potentials in photothermal therapy and photoacoustic tomography for their unique localized surface plasmon resonant absorption in the second near-infrared biologically transparent window. In this study, strong thermal-induced nonlinear negative-lens effect in aqueous suspensions containing Cu2−xSe NPs was observed. Furthermore, the nonlinear absorption was notably enhanced in aqueous suspensions containing Au@Cu2−xSe core–shell NPs, as the positive nonlinear absorption coefficient increased by 20-fold, attributed to the strong plasmonic coupling in Au@Cu2−xSe core–shell NPs. This finding underscores the importance of the nonlinear optical behaviors of plasmonic NPs in biomedical applications, as they offer extra strategy for optimizing systems and incorporating additional functionalities.
doi_str_mv	10.1063/5.0225508
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subjects	Absorptivity Biomedical materials Chalcogenides Copper Core-shell particles Nanoparticles Near infrared radiation Nonlinear optics Nonlinear systems Nonlinearity Photoacoustic effect Plasmonics Surface plasmon resonance
title	Enhanced optical nonlinearity in suspensions of dual-resonance gold–copper chalcogenide core–shell nanoparticles
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