Ambient Tip-Enhanced Photoluminescence with 5 nm Spatial Resolution

Wang, Chih-Feng; Zamkov, Mikhail; El-Khoury, Patrick Z.

doi:10.1021/acs.jpcc.1c04012

Ambient Tip-Enhanced Photoluminescence with 5 nm Spatial Resolution

Journal Article · Thu Jun 10 04:00:00 EDT 2021 · Journal of Physical Chemistry C

DOI:https://doi.org/10.1021/acs.jpcc.1c04012· OSTI ID:1804293

Wang, Chih-Feng ^[1]; Zamkov, Mikhail ^[2]; ^[1]

BATTELLE (PACIFIC NW LAB)
Bowling Green State University

We achieve record spatial resolution in ambient tip-enhanced photoluminescence (TEPL) from CdSe/ZnS semiconductor quantum dots (QDs). Our approach only takes advantage of surface roughness at the apex of a sputtered plasmonic gold probe. When irradiated with visible light (633 and 532 nm lasers), nano-corrugated regions of the apex of an Au tip support 5-nm spatial resolution in TEPL imaging of QD aggregates on silicon. The reproducibility of our observations is illustrated using different plasmonic probes and samples. The origin of the observed near-field contrast, underlying the demonstrated high spatial resolution in TEPL, is discussed in the context of field enhancement at the metal tip-fluorophore interface.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1804293

Report Number(s):: PNNL-SA-163537

Journal Information:: Journal of Physical Chemistry C, Journal Name: Journal of Physical Chemistry C Journal Issue: 22 Vol. 125

Country of Publication:: United States

Language:: English

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