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Dynamic piezoelectric MEMS-based optical metasurfaces.

Chao Meng1, Paul C V Thrane2, Fei Ding1

  • 1Centre for Nano Optics, University of Southern Denmark, Campusvej 55, Odense DK-5230, Denmark.

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This study introduces a dynamic optical metasurface (OMS) platform using microelectromechanical systems (MEMS). This innovation enables efficient, broadband, and fast control over light wavefronts for advanced optical systems.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Microelectromechanical Systems

Background:

  • Static optical metasurfaces (OMSs) offer limited reconfigurability.
  • Existing dynamic OMSs often have limitations in performance and adaptability.

Purpose of the Study:

  • To develop an electrically driven dynamic OMS platform.
  • To achieve controllable phase and amplitude modulation of reflected light.
  • To overcome limitations of static and previous dynamic OMS configurations.

Main Methods:

  • Integration of a thin-film piezoelectric microelectromechanical system (MEMS) with a gap-surface plasmon-based OMS.
  • Utilizing MEMS actuation for fine control over OMS mirror configurations.
  • Characterization of modulation efficiency, operational bandwidth, and response time.

Main Results:

  • Demonstrated a dynamic MEMS-OMS platform with controllable phase and amplitude modulation.
  • Achieved polarization-independent beam steering and 2D focusing.
  • Exhibited high modulation efficiencies (~50%), broadband operation (~20% near 800 nm), and fast responses (<0.4 ms).

Conclusions:

  • The developed MEMS-OMS platform provides a flexible solution for dynamic 2D wavefront manipulation.
  • This technology has potential applications in reconfigurable and adaptive optical networks.
  • The platform overcomes previous limitations, offering enhanced reconfigurability and performance.