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Dual Resonant Sum Frequency Generations from Two-Dimensional Materials

Title
Dual Resonant Sum Frequency Generations from Two-Dimensional Materials
Authors
Kim, YoungjaeKim, HyunminJang, HoukAhn, Jong-HyunLee, JaeDong
DGIST Authors
Kim, HyunminLee, JaeDong
Issue Date
2020-06
Citation
Nano Letters, 20(6), 4530-4536
Type
Article
Article Type
Article
Author Keywords
SFGdual resonanceexcitonic resonanceTMDrt-TDDFT
Keywords
STIMULATED-EMISSIONMOS2
ISSN
1530-6984
Abstract
We propose dual resonant optical sum frequency generation (SFG), where the two most singular resonances could be selected, and report for the monolayer (1L-) WSe2 when one (ω1) of two excitation pulses is resonant to A exciton and their sum frequency (ω1 + ω2) to D exciton. The dual resonant SFG confirms that, under an irradiation of ω1 and ω2 pulses with the same fluence of ∼1.4 × 1010 W/m2, its signal intensity could be enhanced about 20 times higher than the resonant SHG (i.e., 2ω1 to the D excitonic absorption). Further, the dual resonant SFG intensity of 1L-WSe2 is found to be 1 order of magnitude higher than the single resonant SFG intensity of 1L-WS2 under the same condition of two-pulse irradiation. Finally, observations of the dual resonant SFG are thoroughly examined using real-time time-dependent density functional theory (rt-TDDFT), and the relevant nonlinear optical characteristics are scrutinized using the Greenwood-Kubo formalism. Copyright © 2020 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/12249
DOI
10.1021/acs.nanolett.0c01363
Publisher
American Chemical Society
Related Researcher
  • Author Lee, JaeDong Light and Matter Theory Laboratory
  • Research Interests Theoretical Condensed Matter Physics; Ultrafast Dynamics and Optics; Nonequilibrium Phenomena
Files:
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Collection:
Division of Biotechnology1. Journal Articles
Department of Emerging Materials ScienceLight and Matter Theory Laboratory1. Journal Articles


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