Direct nano-imaging of light-matter interactions in nanoscale excitonic emitters

Kiyoung Jo, Emanuele Marino, Jason Lynch, Zhiqiao Jiang, Natalie Gogotsi, Thomas P. Darlington, Mohammad Soroush, P. James Schuck, Nicholas J. Borys, Christopher B. Murray and Deep Jariwala ()
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Kiyoung Jo: University of Pennsylvania
Emanuele Marino: University of Pennsylvania
Jason Lynch: University of Pennsylvania
Zhiqiao Jiang: University of Pennsylvania
Natalie Gogotsi: University of Pennsylvania
Thomas P. Darlington: Columbia University
Mohammad Soroush: Montana State University
P. James Schuck: Columbia University
Nicholas J. Borys: Montana State University
Christopher B. Murray: University of Pennsylvania
Deep Jariwala: University of Pennsylvania

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Strong light-matter interactions in localized nano-emitters placed near metallic mirrors have been widely reported via spectroscopic studies in the optical far-field. Here, we report a near-field nano-spectroscopic study of localized nanoscale emitters on a flat Au substrate. Using quasi 2-dimensional CdSe/CdxZn1-xS nanoplatelets, we observe directional propagation on the Au substrate of surface plasmon polaritons launched from the excitons of the nanoplatelets as wave-like fringe patterns in the near-field photoluminescence maps. These fringe patterns were confirmed via extensive electromagnetic wave simulations to be standing-waves formed between the tip and the edge-up assembled nano-emitters on the substrate plane. We further report that both light confinement and in-plane emission can be engineered by tuning the surrounding dielectric environment of the nanoplatelets. Our results lead to renewed understanding of in-plane, near-field electromagnetic signal transduction from the localized nano-emitters with profound implications in nano and quantum photonics as well as resonant optoelectronics.

Date: 2023
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DOI: 10.1038/s41467-023-38189-y

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