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Probing plexciton emission from 2D materials on gold nanotrenches
Junze Zhou1, P A D Gonçalves2, Fabrizio Riminucci3
1The Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA. junzezhou@lbl.gov.
Nature Communications
|November 6, 2024
Summary
Researchers studied plexcitons, formed by surface plasmons and WSe2 excitons. They precisely mapped plexciton spatial extension, enabling nanoscale engineering for future optoelectronics and quantum devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanophotonics
Background:
- Strongly coupled quasiparticle excitations offer insights into material properties.
- Plexcitons, formed by plasmon-exciton interactions, are crucial for novel device functionalities.
Purpose of the Study:
- Investigate plexciton formation and emission in gold nanotrenches and WSe2.
- Characterize strong plasmon-exciton coupling in both far-field and near-field regimes.
- Determine the spatial extension of plexcitons with nanometric precision.
Main Methods:
- Fabrication of narrow gold nanotrenches and monolayer WSe2.
- Far-field reflection spectroscopy to observe Rabi splitting.
- Custom-designed near-field probe for local field distribution mapping.
- Controlled spectral collection at specific probe locations.
Main Results:
- Observed ~80 meV Rabi splitting in far-field reflection spectra under ambient conditions.
- Confirmed plexciton emission predominantly from the lower-frequency branch.
- Precisely mapped plexciton spatial extension to be comparable to nanotrench width.
Conclusions:
- Demonstrated nanometric precision in determining plexciton spatial extension.
- Highlighted prospects for nanoscale mapping and engineering of plexcitons.
- Opened avenues for applications in nanophotonic devices, optoelectronics, and quantum electrodynamics.
