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Tailoring Third-Harmonic Diffraction Efficiency by Hybrid Modes in High-Q Metasurfaces.

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Summary

Silicon metasurfaces enable efficient control of nonlinear light by exciting hybrid Mie-quasi-bound states in the continuum (BIC) modes. This method dramatically enhances third-harmonic generation (THG) beaming into specific diffraction orders.

Keywords:
Third-harmonic diffractionall-dielectric metasurfacebound states in the continuumhigh-Q metasurfacehybrid modewavefront control

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Area of Science:

  • Photonics and optical engineering
  • Materials science
  • Nonlinear optics

Background:

  • Metasurfaces offer advanced light manipulation capabilities.
  • Efficient control of nonlinearly diffracted light remains a challenge.
  • Third-harmonic generation (THG) is a key nonlinear optical process.

Purpose of the Study:

  • To demonstrate nonlinear wavefront control using metasurfaces.
  • To achieve efficient control of THG beaming into specific diffraction orders.
  • To investigate the role of hybrid Mie-quasi-bound states in the continuum (BIC) modes.

Main Methods:

  • Fabrication of a silicon metasurface.
  • Excitation of hybrid Mie-quasi-BIC modes.
  • Measurement of far-field patterns of THG.
  • Analysis of diffraction order switching.

Main Results:

  • Hybridization of Mie-type and quasi-BIC modes was achieved.
  • Significant redistribution of local electric fields was observed.
  • THG diffraction orders switched from 1:6 to 129:1 upon hybrid mode excitation.
  • Efficient nonlinear wavefront control was demonstrated.

Conclusions:

  • Hybrid Mie-quasi-BIC modes enable precise control over nonlinear diffraction patterns.
  • Metasurfaces can be engineered for efficient THG control.
  • This work opens avenues for novel light sources, telecommunications, and quantum photonics.