Light-matter interaction at the single-molecule level probed with STM - Archive ouverte HAL
Communication Dans Un Congrès Année : 2021

Light-matter interaction at the single-molecule level probed with STM

Résumé

Light-matter interaction plays a crucial role in the quantum properties of light emission from single molecules. They are usually probed using optical methods, which are, however, spatially limited by diffraction to a few hundred nanometers. On the other hand, scanning tunneling microscopy (STM) routinely reaches picometre spatial scale. Recent works have shown that the tunneling current of an STM can be used to excite the intrinsic luminescence of individual molecules enabling light-matter interaction investigations with unprecedented resolution. Processes that can be addressed involve charging, dipole-dipole interactions or energy transfer between individual chromophores. Here, we study STM-induced luminescence from phthalocyanine molecules adsorbed on a few-monolayer NaCl film epitaxially grown on Ag(111) substrate. We show how the atomically-confined electromagnetic field at the STM tip apex acts as a “picocavity” for localized plasmons and both enables optical studies with atomic-scale precision and interacts with the emitter [1]. Profiting from that resolution, we investigate a critical mechanism in the photosynthesis process – resonant energy transfer in multichromophoric architectures. We use individual phthalocyanines as ancillary, passive or blocking elements to promote and direct resonant energy transfer between distant donor and acceptor units. Such an approach constitutes a powerful model to study the role of the relative dipole orientation, distance and chemical nature of the chromophores on the efficiency of the energy transfer [2].
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Dates et versions

hal-03456171 , version 1 (02-09-2022)

Identifiants

  • HAL Id : hal-03456171 , version 1

Citer

Anna Rosławska, Tomáš Neuman, Shuiyan Cao, Benjamin Doppagne, Andrei G Borisov, et al.. Light-matter interaction at the single-molecule level probed with STM. 10th international conference on molecular electronics ElecMOL, Nov 2021, Lyon, France. ⟨hal-03456171⟩
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