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Proceedings Paper

Dual-color super-resolution imaging of quantum dot clusters
Author(s): Duncan P. Ryan; Megan K. Dunlap; Somak Majumder; Chris J. Sheehan; James H. Werner; Jennifer A. Hollingsworth; Martin P. Gelfand; Alan Van Orden; Peter M. Goodwin
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Paper Abstract

Semiconductor quantum dots (QDs) in small clusters can exchange excited state energy via various transfer mechanisms such as F¨orster resonant energy transfer (FRET). Such energy transfer enables excitons to move from larger bandgap donors to smaller bandgap acceptors. Clusters of mixed donor/acceptor QD species consequently have a spectral signature that is dependent on which QDs in the clusters are responsible for the emission. Using a dual-color super-resolution imaging approach, we report on the spectral characteristics of interacting QDs in clusters with nanometer spatial resolution. Higher emission intensities from clusters are shown to emanate from sub-regions of the clusters and have spectral signatures that indicate the emission is dominated by the acceptor region of the spectrum. Thus, energy transferring interactions among QDs in clusters funnel excitons primarily to acceptor particles. Acceptor particles are responsible for the majority of the emission from the clusters with an emission spectra corresponding to the spectral profiles of the acceptor species.

Paper Details

Date Published: 13 February 2020
PDF: 7 pages
Proc. SPIE 11246, Single Molecule Spectroscopy and Superresolution Imaging XIII, 112460B (13 February 2020); doi: 10.1117/12.2542352
Show Author Affiliations
Duncan P. Ryan, Los Alamos National Lab. (United States)
Megan K. Dunlap, Colorado State Univ. (United States)
Somak Majumder, Los Alamos National Lab. (United States)
Chris J. Sheehan, Los Alamos National Lab. (United States)
James H. Werner, Los Alamos National Lab. (United States)
Jennifer A. Hollingsworth, Los Alamos National Lab. (United States)
Martin P. Gelfand, Colorado State Univ. (United States)
Alan Van Orden, Colorado State Univ. (United States)
Peter M. Goodwin, Los Alamos National Lab. (United States)


Published in SPIE Proceedings Vol. 11246:
Single Molecule Spectroscopy and Superresolution Imaging XIII
Ingo Gregor; Felix Koberling; Rainer Erdmann, Editor(s)

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