Dark plasmon modes for efficient hot electron generation in multilayers of gold nanoparticles
The excitation of dark plasmons, i.e., coupled plasmon modes with a vanishing net dipole, is expected to favor Landau damping over radiative damping. Dark plasmon excitation might, therefore, lead to an increased absorption of energy within gold nanoparticles, resulting in a strong generation of hot...
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| Veröffentlicht in: | The Journal of chemical physics 2020-02, Vol.152 (6), p.064710-064710 |
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| container_end_page | 064710 |
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| container_issue | 6 |
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| container_title | The Journal of chemical physics |
| container_volume | 152 |
| creator | Hoeing, Dominik Schulz, Florian Mueller, Niclas S. Reich, Stephanie Lange, Holger |
| description | The excitation of dark plasmons, i.e., coupled plasmon modes with a vanishing net dipole, is expected to favor Landau damping over radiative damping. Dark plasmon excitation might, therefore, lead to an increased absorption of energy within gold nanoparticles, resulting in a strong generation of hot electrons compared to the generation via bright plasmons. We performed transient-absorption spectroscopy on gold nanoparticle films to assess the initial electronic temperature before thermalization. We observe a significant increase in the electron–phonon coupling time when dark plasmon modes are excited in these films. The results indicate an efficient energy absorption due to the suppressed radiative decay of dark plasmon modes and a subsequent energy transformation into hot electrons. |
| doi_str_mv | 10.1063/1.5131696 |
| format | Article |
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Dark plasmon excitation might, therefore, lead to an increased absorption of energy within gold nanoparticles, resulting in a strong generation of hot electrons compared to the generation via bright plasmons. We performed transient-absorption spectroscopy on gold nanoparticle films to assess the initial electronic temperature before thermalization. We observe a significant increase in the electron–phonon coupling time when dark plasmon modes are excited in these films. 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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Coupled modes Dipoles Energy absorption Energy conversion Excitation Gold Hot electrons Landau damping Multilayers Nanoparticles Physics Plasmons Thermalization (energy absorption) |
| title | Dark plasmon modes for efficient hot electron generation in multilayers of gold nanoparticles |
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