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Electrically and all-optically switchable nonlocal nonlinear metasurfaces.

Mukesh Sharma1,2, Mai Tal1,2, Cormac McDonnell1,2

  • 1Department of Physical Electronics, Faculty of Engineering, Tel-Aviv University, Tel-Aviv 6779801, Israel.

Science Advances
|August 16, 2023
PubMed
Summary
This summary is machine-generated.

This study demonstrates tunable nonlinear effects in metasurfaces using liquid crystals. Researchers achieved significant electrical and optical control over second-harmonic generation for advanced optical devices.

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Area of Science:

  • Metasurfaces and Nanophotonics
  • Nonlinear Optics
  • Liquid Crystal Technology

Background:

  • Nonlocal effects in metasurfaces are crucial for spectral selectivity and enhanced optical interactions.
  • These effects enable nonlinear phenomena like frequency conversion but active tuning remains underexplored.
  • Developing actively tunable nonlinear optical devices is essential for sensing and signal processing.

Purpose of the Study:

  • To investigate the electric and all-optical tunability of nonlocal second-harmonic generation (SHG).
  • To explore the use of liquid crystals (LCs) in functionalizing nonlinear metasurfaces for dynamic control.
  • To demonstrate novel nanoscale metadevices with tunable nonlinear optical properties.

Main Methods:

  • Functionalization of a nonlinear metasurface with a twisted nematic liquid-crystal (LC) layer.
  • Excitation of surface lattice resonance to induce strong nonlocal SHG.
  • Application of electrical and all-optical stimuli to tune the nonlinear response.

Main Results:

  • Emergence of strong nonlocal SHG due to LC integration and surface lattice resonance.
  • Demonstrated significant enhancement of SHG on resonance.
  • Achieved over 25 dB electrical switching amplitude and observed all-optically induced phase transitions in SHG.

Conclusions:

  • The integration of LCs provides drastic electric and all-optical tunability of nonlocal SHG in metasurfaces.
  • This work introduces a promising pathway for active nonlinear optical metadevices with nanoscale control.
  • The demonstrated dynamic nonlocal effects are highly relevant for future sensing and signal processing applications.