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Stacking Engineering toward Giant Second Harmonic Generation in Twisted Graphene Superstructures.

Ge Song1,2, Hao Hong3, Chaojie Ma3

  • 1Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.

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Summary
This summary is machine-generated.

Researchers enhanced second harmonic generation (SHG) in twisted multilayer graphene by engineering stacking. This giant SHG response shows promise for advanced nanophotonic devices.

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Area of Science:

  • Materials Science
  • Optics
  • Condensed Matter Physics

Background:

  • Nonlinear optical properties of graphene are crucial for nanophotonic devices.
  • Second harmonic generation (SHG) is typically forbidden in symmetric graphene structures.
  • Enhancing SHG in graphene is essential for practical nanophotonic applications.

Purpose of the Study:

  • To investigate and enhance the second harmonic generation (SHG) performance in twisted multilayer graphene.
  • To explore the role of stacking engineering in modulating SHG in few-layer graphene.
  • To demonstrate a significant enhancement of SHG intensity in engineered graphene structures.

Main Methods:

  • Fabrication and characterization of twisted multilayer graphene structures.
  • Utilizing stacking engineering to control graphene layer arrangements.
  • Experimental measurement of second harmonic generation (SHG) intensity under 1064 nm excitation.

Main Results:

  • Demonstrated giant SHG intensity in twisted multilayer graphene structures.
  • Observed SHG intensity nearly 10 times that of monolayer MoS2.
  • Identified modulation of in-plane and out-of-plane SHG susceptibility as key to enhancement.

Conclusions:

  • Stacking engineering provides a facile and effective method to enhance SHG in graphene.
  • Twisted multilayer graphene exhibits superior SHG performance compared to previously reported graphene structures.
  • The findings pave the way for advanced graphene-based second harmonic nanophotonic devices and 2D material SHG studies.