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Electrostatic steering of thermal emission with active metasurface control of delocalized modes

Author

Listed:
  • Joel Siegel

    (University of Wisconsin-Madison)

  • Shinho Kim

    (Korea Advanced Institute of Science and Technology)

  • Margaret Fortman

    (University of Wisconsin-Madison)

  • Chenghao Wan

    (University of Wisconsin-Madison)

  • Mikhail A. Kats

    (University of Wisconsin-Madison)

  • Philip W. C. Hon

    (Northrop Grumman Corporation)

  • Luke Sweatlock

    (Northrop Grumman Corporation)

  • Min Seok Jang

    (Korea Advanced Institute of Science and Technology)

  • Victor Watson Brar

    (University of Wisconsin-Madison)

Abstract

We theoretically describe and experimentally demonstrate a graphene-integrated metasurface structure that enables electrically-tunable directional control of thermal emission. This device consists of a dielectric spacer that acts as a Fabry-Perot resonator supporting long-range delocalized modes bounded on one side by an electrostatically tunable metal-graphene metasurface. By varying the Fermi level of the graphene, the accumulated phase of the Fabry-Perot mode is shifted, which changes the direction of absorption and emission at a fixed frequency. We directly measure the frequency- and angle-dependent emissivity of the thermal emission from a fabricated device heated to 250 °C. Our results show that electrostatic control allows the thermal emission at 6.61 μm to be continuously steered over 16°, with a peak emissivity maintained above 0.9. We analyze the dynamic behavior of the thermal emission steerer theoretically using a Fano interference model, and use the model to design optimized thermal steerer structures.

Suggested Citation

  • Joel Siegel & Shinho Kim & Margaret Fortman & Chenghao Wan & Mikhail A. Kats & Philip W. C. Hon & Luke Sweatlock & Min Seok Jang & Victor Watson Brar, 2024. "Electrostatic steering of thermal emission with active metasurface control of delocalized modes," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47229-0
    DOI: 10.1038/s41467-024-47229-0
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