Strong near-field interactions and generation of energetic (hot) electrons are intrinsic properties of any plasmonic nanostructure under illumination. Simultaneously, a striking advantage of metal nanocrystals over semiconductors lies in their very large absorption cross sections. Therefore, metal nanostructures with strong and tailored plasmonic resonances are very attractive for various applications, which typically involve excited states of matter, such as plasmons and energetic (hot) electrons. For the plasmons and associated energy-transfer mechanisms, the central questions are in the transfer efficiency and heat losses. In the problem of plasmonic hot electrons, the central questions are quantifying the number of optically excited energetic electrons in a nanocrystal and finding out how to extract such electrons. In our study, we develop a theory describing the generation rates and the energy distributions of hot electrons in nanocrystals with various geometries. Hot-electron generation together with non-radiative plasmonic transfer represent efficient mechanisms to transport and localize optical and photo-chemical energies.

Nonradiative energy transfer and hot-electron generation in plasmonic bio-assemblies and metastructures with hot spots

2019 Fall National Meeting

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