Probing plexciton emission from 2D materials on gold nanotrenches

Junze Zhou (), P. A. D. Gonçalves, Fabrizio Riminucci, Scott Dhuey, Edward S. Barnard, Adam Schwartzberg, F. Javier García de Abajo () and Alexander Weber-Bargioni ()
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Junze Zhou: Lawrence Berkeley National Laboratory
P. A. D. Gonçalves: The Barcelona Institute of Science and Technology
Fabrizio Riminucci: Lawrence Berkeley National Laboratory
Scott Dhuey: Lawrence Berkeley National Laboratory
Edward S. Barnard: Lawrence Berkeley National Laboratory
Adam Schwartzberg: Lawrence Berkeley National Laboratory
F. Javier García de Abajo: The Barcelona Institute of Science and Technology
Alexander Weber-Bargioni: Lawrence Berkeley National Laboratory

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Probing strongly coupled quasiparticle excitations at their intrinsic length scales offers unique insights into their properties and facilitates the design of devices with novel functionalities. In this work, we investigate the formation and emission characteristics of plexcitons, arising from the interaction between surface plasmons in narrow gold nanotrenches and excitons in monolayer WSe2. We study this strong plasmon–exciton coupling in both the far-field and the near-field. Specifically, we observe a Rabi splitting in the far-field reflection spectra of about 80 meV under ambient conditions, consistent with our theoretical modeling. Using a custom-designed near-field probe, we find that plexciton emission originates predominantly from the lower-frequency branch, which we can directly probe and map its local field distribution. We precisely determine the plexcitonʼs spatial extension, similar to the trench width, with nanometric precision by collecting spectra at controlled probe locations. Our work opens exciting prospects for nanoscale mapping and engineering of plexcitons in complex nanostructures with potential applications in nanophotonic devices, optoelectronics, and quantum electrodynamics in nanoscale cavities.

Date: 2024
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DOI: 10.1038/s41467-024-53669-5

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