What is it about?

Strong scattering and optical absorption bands result in Au nanoparticles (NPs) when incoming light at an optimal wavelength couples resonantly to free electrons within the AuNPs, collectively referred to as surface plasmon resonance (SPR). At the same time, when light shines on a semiconducting van der Waals solid, it generates electron-hole pairs or excitons. In this work, we have examined the interaction of excitons with SPRs through the geometry dependent shape of the AuNPs, from spherical to bipyramidical, as a modality to tune the light-matter interactions in semiconducting van der Waals solids for photoabsorbers and quantum photonics.

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Why is it important?

Through our temperature-dependent and wavelength-dependent optoelectronic transport measurements, a shift in the spectral response of monolayer vapor synthesized WSe2 was noted, towards the SPR peak locations of Au-Spherical and Au-Bipyramidical NPs.


Our work is unique since it shows we can tailor the spectral response of WSe2 through the consideration of AuNP’s structural and geometrical attributes, as they decorate the surface of WSe2. This can help guide the investigation of these so-called plexcitonic interactions in other material systems to widen the possible selection of 0D-2D ensembles for high performance optoelectronic and quantum photonics applications. Anupama Kaul

PACCAR Professor of Engineering Anupama B Kaul

Read the Original

This page is a summary of: Plexcitonic interactions in spherical and bi-pyramidical Au nanoparticles with monolayer WSe2, Applied Physics Letters, November 2022, American Institute of Physics,
DOI: 10.1063/5.0120636.
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