Super-resolution photoluminescence lifetime and intensity mapping of interacting CdSe/CdS quantum dots
We report an optical imaging method that simultaneously achieves nanometer-scale spatial resolution and records single-photon arrival times with subnanosecond temporal resolution, allowing for visualization of nanoscale photoluminescence dynamics. The technique combines time-correlated single-photon counting with single-molecule localization microscopy by monitoring the emission centroid location with a 2 × 2 array of optical fibers that are coupled to four single-photon counting detectors. We applied this method to image isolated and clustered CdSe/CdS core/shell quantum dots (QDs). Single QDs were localized with ~5 nm precision using 104 detected photons. We note within clusters, emission centroids separated by ~12 nm were resolved, and spatial mapping of both the emission intensity and lifetime provided evidence of energy transport pathways among the QDs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)
- Sponsoring Organization:
- USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC); Gary E. Maciel Fellowship Foundation
- Grant/Contract Number:
- 89233218CNA000001
- OSTI ID:
- 1630862
- Report Number(s):
- LA-UR--19-30441
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 2 Vol. 116; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Nanoscale imaging of quantum dot dimers using time-resolved super-resolution microscopy combined with scanning electron microscopy
Covalent Protein Labeling and Improved Single-Molecule Optical Properties of Aqueous CdSe/CdS Quantum Dots