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arXiv · 2412.13366

Harmonic-Induced Plasmonic Resonant Energy Transfer between Metal and Semiconductor Nanoparticles

Yueming Yan·Nathan J. Spear·Adam J. Cummings·Karina Khusainova·Janet E. Macdonald·Richard F. Haglund
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Abstract

Heterostructures combining two or more metal and/or semiconductor nanoparticles exhibit enhanced upconversion arising from localized surface plasmon resonances (LSPRs). However, coupled plasmon-exciton systems are slowed by excitonic relaxation and metallic multi-plasmon systems are not broadly tunable. Here, we describe a heterostructure in which insulating alumina layers vary separation between CuS and Au nanoparticles, allowing experimental confirmation of the d^(-6) dependence typical of surface-dipole mediated interactions between Au and CuS plasmons, as demonstrated in Lumerical simulations. Transient-absorption spectroscopy shows faster plasmon relaxation in heterostructured Au/CuS (690 fs) than CuS nanoparticles (929 fs), signifying direct energy transfer. Moreover, coupling between the second-harmonic LSPRs of CuS and the fundamental LSPR in Au is evident in nonlinear absorption measurement. This defines a novel harmonic-induced plasmonic resonant energy transfer (HIPRET) dynamic linking the metallic Au plasmon and the broad semiconductor plasmon in CuS. This prototype for tunable, ultrafast plasmonic upconversion exemplifies a strategy for high-efficiency nonlinear nanodevices that have promising applications in photocatalysis, parametric down-conversion and biomedical imaging.

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Yueming Yan, Nathan J. Spear, Adam J. Cummings, Karina Khusainova, Janet E. Macdonald, Richard F. Haglund. 2024-12-17. Harmonic-Induced Plasmonic Resonant Energy Transfer between Metal and Semiconductor Nanoparticles. https://arxiv.org/abs/2412.13366

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