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Dual Resonant Sum Frequency Generations from Two-Dimensional Materials.

Youngjae Kim1, Hyunmin Kim2, Houk Jang3

  • 1Department of Emerging Materials Science, DGIST, Daegu 42988, Republic of Korea.

Nano Letters
|May 19, 2020
PubMed
Summary
This summary is machine-generated.

Dual resonant optical sum frequency generation (SFG) significantly enhances signal intensity in monolayer tungsten diselenide (WSe2). This advanced technique boosts nonlinear optical signals by 20 times compared to resonant second harmonic generation.

Keywords:
SFGTMDdual resonanceexcitonic resonancert-TDDFT

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nonlinear Optics

Background:

  • Sum frequency generation (SFG) is a powerful nonlinear optical technique.
  • Monolayer transition metal dichalcogenides (TMDs) like WSe2 exhibit unique excitonic properties.
  • Optimizing SFG for enhanced signal detection in 2D materials is crucial.

Purpose of the Study:

  • To investigate dual resonant SFG in monolayer WSe2.
  • To explore the enhancement of SFG signal intensity by tuning excitation frequencies to specific excitonic resonances.
  • To compare dual resonant SFG with single resonant SFG and resonant second harmonic generation (SHG).

Main Methods:

  • Employing dual resonant SFG by exciting one pulse (ω1) to the A exciton and the sum frequency (ω1 + ω2) to the D exciton in 1L-WSe2.
  • Irradiating with two pulses of equal fluence (∼1.4 × 1010 W/m2).
  • Utilizing real-time time-dependent density functional theory (rt-TDDFT) and the Greenwood-Kubo formalism for analysis.

Main Results:

  • Achieved a 20-fold enhancement in SFG signal intensity compared to resonant SHG (2ω1 to D exciton).
  • Demonstrated that dual resonant SFG in 1L-WSe2 is 1 order of magnitude stronger than single resonant SFG in 1L-WS2 under identical conditions.
  • Confirmed the dual resonant enhancement mechanism through theoretical calculations.

Conclusions:

  • Dual resonant SFG is a highly effective method for amplifying nonlinear optical signals in 2D materials.
  • This technique offers a significant improvement over conventional methods for probing excitonic properties.
  • The findings pave the way for advanced optical characterization of novel quantum materials.