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Hybrid Three-Dimensional Spiral WSe2 Plasmonic Structures for Highly Efficient Second-Order Nonlinear Parametric

Xianqing Lin1,2, Yingying Liu1,2, Kang Wang1,2

  • 1Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

Research (Washington, D.C.)
|September 25, 2019
PubMed
Summary

Hybrid 3D spiral tungsten diselenide (WSe2) plasmonic structures boost nanoscale light generation. These structures achieve highly efficient second harmonic generation (SHG) and sum-frequency generation (SFG) through enhanced light-matter interactions.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Nonlinear Optics

Background:

  • Two-dimensional (2D) layered materials offer large second-order nonlinear susceptibility for nanoscale coherent light generation.
  • The atomic thinness of 2D materials limits field confinement and light-matter interaction, reducing nonlinear conversion efficiency.
  • Enhanced light-matter interaction is crucial for improving nonlinear optical processes in 2D materials.

Purpose of the Study:

  • To fabricate hybrid three-dimensional (3D) spiral tungsten diselenide (WSe2) plasmonic structures.
  • To enhance light-matter interaction for efficient nonlinear optical parametric processes.
  • To achieve high conversion efficiency for second harmonic generation (SHG) and sum-frequency generation (SFG).

Main Methods:

  • Fabrication of hybrid 3D spiral WSe2 plasmonic structures.
  • Utilizing AA lattice stacking in WSe2 for constructive interference of nonlinear polarization.
  • Integration of WSe2 with plasmonic structures to enhance light-matter interaction.

Main Results:

  • Achieved highly efficient SHG and SFG due to enhanced light-matter interaction.
  • Demonstrated efficient SH radiation from 3D spiral WSe2 via constructive interference.
  • Obtained an extremely high external SHG conversion efficiency of approximately 2.437×10^-5.
  • Showcased simultaneous efficient SHG and SFG due to ease of phase-matching and enhanced interaction.

Conclusions:

  • Hybrid 3D spiral WSe2 plasmonic structures significantly improve nonlinear optical conversion efficiency.
  • The proposed structures provide a viable platform for efficient nanoscale coherent light generation.
  • These findings offer insights for designing advanced structures for nonlinear optical applications.