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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Metasurface of Strongly Coupled Excitons and Nanoplasmonic Arrays.

Farsane Tabataba-Vakili^1,2, Lukas Krelle¹, Lukas Husel¹

¹Fakultät für Physik, Munich Quantum Center, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany.

|August 6, 2024

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Researchers created a novel polaritonic metasurface using tungsten disulfide (WSe2) and gold nanostructures. This breakthrough enables enhanced light-matter interactions and tunable optical properties for advanced nanophotonics.

Area of Science:

Nanophotonics and Materials Science
Optics and Light-Matter Interactions

Background:

Metasurfaces offer nanoscale light manipulation.
Transition metal dichalcogenide monolayers enhance optical properties and light-matter interactions in ultrathin optics.

Purpose of the Study:

To realize a polaritonic metasurface by coupling excitons in monolayer tungsten disulfide (WSe2) with nanoplasmonic gold arrays.
To achieve strong light-matter coupling for tunable optical properties and enhanced light-matter interactions.

Main Methods:

Fabrication of gold nanodisk arrays within hexagonal boron nitride.
Integration of monolayer WSe2 to ensure spectrally narrow exciton transitions near plasmonic near-fields.
Characterization of the resulting van der Waals metasurface in the strong coupling regime.

Keywords:

exciton-plasmon-polaritons metasurface nanoplasmonic array plasmonic surface lattice resonance strong-coupling two-dimensional semiconductors

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Main Results:

Demonstration of a polaritonic metasurface with characteristics of lattice polaritons.
Observation of a directional and linearly polarized far-field emission profile.
Successful coupling of WSe2 excitons with surface lattice resonances of gold nanodisks.

Conclusions:

Structured van der Waals metasurfaces can engineer polaritonic lattices.
The developed fabrication method enables precise control over light-matter interactions.
This approach paves the way for novel tunable optical devices and nanophotonic applications.