Dual Resonant Sum Frequency Generations from Two-Dimensional Materials

Youngjae Kim, Hyunmin Kim, Houk Jang, Jong Hyun Ahn, J. D. Lee

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)4530-4536
Number of pages7
JournalNano letters
Issue number6
Publication statusPublished - 2020 Jun 10

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program (2019R1A2C1005050, 2017K1A3A1A1907045513) through the National Research Foundation of Korea (NRF) and also by the DGIST R&D program (20-CoE-NT-01), funded by the Ministry of Science and ICT.

Publisher Copyright:
Copyright © 2020 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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