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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Metasurfaces offer potential for controlling light properties.
  • Dynamic and ultrafast tuning is crucial for applications, especially in the ultraviolet spectrum.

Purpose of the Study:

  • To present an all-optical nonlinear method for dynamic beam shaping.
  • To achieve ultrafast control over beam profile and angular distribution.

Main Methods:

  • Utilized a pump-probe setup with a digital mirror device to project spatial patterns.
  • Employed an all-dielectric Fano resonant metasurface interacting with visible (pump) and infrared (probe) light pulses.
  • Tuned the infrared probe near the Fano resonance to generate third harmonics, modulated by the visible pump pulse.

Main Results:

  • Demonstrated all-optical nonlinear beam shaping in both profile and angular distribution.
  • Observed local deactivation of harmonic generation by the pump pulse, altering resonance properties.
  • Generated satellite diffraction orders in Fourier space, indicating coherent emission and directional control.

Conclusions:

  • This work enables ultrafast and precise control over harmonic beam profiles and directionality at the generation stage.
  • The all-optical approach provides a new pathway for dynamic metasurface functionalities.