Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session A52: Active Optical Devices
8:00 AM–11:00 AM,
Monday, March 6, 2023
Room: Room 308
Sponsoring
Unit:
FIAP
Chair: Oleksiy Svitelsky
Abstract: A52.00014 : Rapid nonlinear imaging spectroscopy for advanced material characterization*
10:36 AM–10:48 AM
Presenter:
Torben Lennart Purz
(University of Michigan)
Authors:
Torben Lennart Purz
(University of Michigan)
Eric W Martin
(MONSTR Sense Technologies, LLC)
Blake T Hipsley
(University of Michigan)
William G Holtzmann
(University of Washington)
Pasqual Rivera
(University of Washington)
Adam Alfrey
(University of Michigan)
Kelsey M Bates
(University of Michigan)
Ronald Ulbricht
(Max Planck Institute for Polymer Research)
Hui Deng
(University of Michigan)
Xiaodong Xu
(University of Washington)
Steven T Cundiff
(University of Michigan)
Here, we demonstrate nonlinear imaging spectroscopy of 2D materials that assesses the quality of samples through measurement of their nonlinear response, exciton dephasing, and exciton lifetimes. We use an exfoliated MoSe2 monolayer, chemical-vapor-deposition-grown WSe2 monolayer, and exfoliated MoSe2/WSe2 heterostructure as canonical examples to demonstrate these capabilities.
By comparison, we show that extracting material parameters such as four-wave mixing (FWM) intensity, dephasing times, excited state lifetimes, exciton-coupling strength, and distribution of dark/localized states allows for a more accurate assessment of the quality of a sample than current prevalent techniques, including white light microscopy, linear micro-reflectance spectroscopy, and photo-luminescence. In addition, we highlight the sensitivity of spatial and temporal coherence toward strain while coherent exciton coupling and charge transfer in these samples remain mostly unaffected.
*NSF Grant No. 2016356, DOE grant DESC0022179, NSF Grant No. 2015068, DOE grant DE-SC0012509, NSF Grant DGE-1762114
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