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Atomically phase-matched second-harmonic generation in a 2D crystal.

Mervin Zhao1,2, Ziliang Ye1,2, Ryuji Suzuki3,4

  • 1Department of Mechanical Engineering, NSF Nanoscale Science and Engineering Center, University of California, Berkeley, CA 94720, USA.

Light, Science & Applications
|September 1, 2018
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Summary
This summary is machine-generated.

Researchers explored second-harmonic generation (SHG) in molybdenum disulfide (MoS2) 2D crystals. They found that the 3R crystal phase exhibits constructive SHG, enabling new applications in nonlinear optics.

Keywords:
3R-MoS2atomically thinphase-matchingsecond-harmonic generation

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nonlinear Optics

Background:

  • Second-harmonic generation (SHG) is crucial for applications ranging from lasers to microscopy.
  • While single-layer van der Waals (vdW) crystals exhibit SHG, stacking often restores symmetry, hindering applications.
  • Molybdenum disulfide (MoS2) typically shows oscillatory SH response due to layer stacking.

Purpose of the Study:

  • To investigate SHG in the noncentrosymmetric 3R crystal phase of MoS2.
  • To understand the influence of crystal structure and layer stacking on SHG.
  • To explore the potential of 3R-MoS2 as a tunable nonlinear optical material.

Main Methods:

  • Experimental probing of SHG in few-layer 2D MoS2.
  • Analysis of the layer number dependence of second-harmonic intensity.
  • Utilizing SHG spectroscopy to study excitonic transitions (A and B) in 3R-MoS2.

Main Results:

  • Observed a quadratic dependence of SHG intensity on the number of layers in 3R-MoS2.
  • Demonstrated constructive interference of nonlinear dipoles due to atomic phase matching.
  • Identified distinct electronic structure differences and the impact of symmetry on nonlinear properties.

Conclusions:

  • The 3R crystal phase of MoS2 offers a reliable platform for tunable nonlinear optical media.
  • Atomically phase-matched nonlinear dipoles in 3R-MoS2 lead to constructive SHG.
  • This work highlights the critical role of crystal structure and symmetry in 2D material nonlinear optics.