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Area of Science:

  • Nonlinear optics
  • Metasurface optics
  • Quantum optics

Background:

  • Plasmonic metasurfaces offer unique light manipulation capabilities.
  • Controlling nonlinear optical effects in thin devices remains challenging.
  • Giant nonlinear responses are crucial for advanced optical functionalities.

Purpose of the Study:

  • To establish a platform for controlling nonlinear wavefronts using plasmonic metasurfaces.
  • To design flat nonlinear metasurfaces for efficient second-harmonic generation.
  • To achieve precise control over light beam steering, focusing, and polarization.

Main Methods:

  • Application of the Pancharatnam-Berry phase approach.
  • Loading plasmonic metasurfaces with highly nonlinear multiquantum-well substrates.
  • Designing flat metasurfaces for nonlinear wave front control.

Main Results:

  • Demonstrated a platform for arbitrary control of nonlinear wavefronts.
  • Achieved efficient second-harmonic radiation with beam steering, focusing, and polarization manipulation.
  • Showcased giant localized nonlinear effects in thin devices.

Conclusions:

  • The Pancharatnam-Berry phase approach relaxes phase matching constraints in nonlinear optics.
  • Unprecedented local wavefront control is achieved over thin devices.
  • Opens new avenues for nonlinear optics with enhanced control and efficiency.