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Electrically programmable pixelated coherent mid-infrared thermal emission.

Xiu Liu1, Yibai Zhong1, Zexiao Wang1

  • 1Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA.

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Summary
This summary is machine-generated.

Researchers developed electrically tunable mid-infrared metasurfaces using graphene field-effect transistors (Gr-FETs). This breakthrough enables dynamic control over light emission for advanced optical applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Active metasurfaces offer dynamic control of electromagnetic fields but face challenges in post-fabrication tunability, especially in the mid-infrared spectrum.
  • Material limitations and design complexity hinder the widespread application of tunable mid-infrared metasurfaces.

Purpose of the Study:

  • To experimentally demonstrate a highly dynamic, pixelated modulation of coherent mid-infrared emission.
  • To overcome limitations in mid-infrared metasurface tunability using an electrically programmable approach.

Main Methods:

  • Integration of graphene field-effect transistors (Gr-FETs) with plasmonic metasurfaces for electrical programmability.
  • Utilizing graphene's infrared transparency for customized control over plasmonic meta-atoms.
  • Synergizing spatial temperature modulation from Gr-FETs with emissivity control via localized surface plasmon polaritons and quasi-bound states in continuum from gold nanoantennas.

Main Results:

  • Achieved coherent mid-infrared emission states tunable across a broad range of wavelengths, directions, and polarizations.
  • Demonstrated effective spatial temperature-emissivity modulation in a pixelated 2D array with low crosstalk.
  • Validated the potential for scalable 2D electrical wiring for densely packed, independently addressable pixels.

Conclusions:

  • The developed Gr-FET integrated metasurface provides unprecedented electrical control over mid-infrared emission.
  • This platform paves the way for advanced optical devices and systems requiring dynamic, pixelated mid-infrared light modulation.