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GHz-Speed Wavefront Shaping Metasurface Modulators Enabled by Resonant Electro-Optic Nanoantennas.

Sahil Dagli1, Jiyong Shim1, Hamish Carr Delgado1

  • 1Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA.

Advanced Materials (Deerfield Beach, Fla.)
|July 27, 2025
PubMed
Summary
This summary is machine-generated.

This study presents electro-optic metasurfaces for high-speed light modulation and wavefront shaping. These devices offer GHz modulation bandwidth and efficient control for advanced optical applications.

Keywords:
electro‐opticlithium niobatemetasurfacesnanophotonics

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Area of Science:

  • Photonics and Nanotechnology
  • Optoelectronics
  • Metamaterials

Background:

  • Metasurfaces offer compact optical modulation but often face bandwidth and efficiency limitations.
  • Existing electro-optic platforms struggle to achieve high modulation speeds and wavefront control simultaneously.

Purpose of the Study:

  • To develop electro-optically tunable metasurfaces with GHz amplitude modulation and transmissive wavefront shaping capabilities.
  • To explore the potential of resonant electro-optic nanoantennas for high-performance optical devices.

Main Methods:

  • Designed a metasurface using silicon nanobars on thin-film lithium niobate with gold electrodes.
  • Utilized guided mode resonances in the nanobar, tuned by voltage-biased lithium niobate's refractive index.
  • Investigated modulation dependence on resonance quality factor and electrode limitations on bandwidth.

Main Results:

  • Achieved absolute transmittance modulation of 7.1% with ±5 V bias.
  • Demonstrated modulation bandwidth exceeding 800 MHz for amplitude modulation.
  • Showcased a beamsplitting metasurface with 1.03 GHz modulated diffraction efficiency.

Conclusions:

  • The resonant nanoantenna platform enables high-speed modulation and wavefront control.
  • These metasurfaces are foundational for compact, high-bandwidth free-space communication and sensing devices.