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Ultrathin 2 nm gold as impedance-matched absorber for infrared light

Author

Listed:
  • Niklas Luhmann

    (TU Wien)

  • Dennis Høj

    (Technical University of Denmark)

  • Markus Piller

    (TU Wien)

  • Hendrik Kähler

    (TU Wien)

  • Miao-Hsuan Chien

    (TU Wien)

  • Robert G. West

    (TU Wien)

  • Ulrik Lund Andersen

    (Technical University of Denmark)

  • Silvan Schmid

    (TU Wien)

Abstract

Thermal detectors are a cornerstone of infrared and terahertz technology due to their broad spectral range. These detectors call for efficient absorbers with a broad spectral response and minimal thermal mass. A common approach is based on impedance-matching the sheet resistance of a thin metallic film to half the free-space impedance. Thereby, one can achieve a wavelength-independent absorptivity of up to 50%. However, existing absorber films typically require a thickness of the order of tens of nanometers, which can significantly deteriorate the response of a thermal transducer. Here, we present the application of ultrathin gold (2 nm) on top of a surfactant layer of oxidized copper as an effective infrared absorber. An almost wavelength-independent and long-time stable absorptivity of 47(3)%, ranging from 2 μm to 20 μm, can be obtained. The presented absorber allows for a significant improvement of infrared/terahertz technologies in general and thermal detectors in particular.

Suggested Citation

  • Niklas Luhmann & Dennis Høj & Markus Piller & Hendrik Kähler & Miao-Hsuan Chien & Robert G. West & Ulrik Lund Andersen & Silvan Schmid, 2020. "Ultrathin 2 nm gold as impedance-matched absorber for infrared light," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15762-3
    DOI: 10.1038/s41467-020-15762-3
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    Cited by:

    1. Chenxinyu Pan & Yuanbiao Tong & Haoliang Qian & Alexey V. Krasavin & Jialin Li & Jiajie Zhu & Yiyun Zhang & Bowen Cui & Zhiyong Li & Chenming Wu & Lufang Liu & Linjun Li & Xin Guo & Anatoly V. Zayats , 2024. "Large area single crystal gold of single nanometer thickness for nanophotonics," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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