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High-quality microresonators in the longwave infrared based on native germanium

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  • Dingding Ren

    (University of Notre Dame
    Norwegian University of Science and Technology (NTNU))

  • Chao Dong

    (University of Notre Dame)

  • Sadhvikas J. Addamane

    (Sandia National Laboratories)

  • David Burghoff

    (University of Notre Dame)

Abstract

The longwave infrared (LWIR) region of the spectrum spans 8 to 14 μm and enables high-performance sensing and imaging for detection, ranging, and monitoring. Chip-scale LWIR photonics has enormous potential for real-time environmental monitoring, explosive detection, and biomedicine. However, realizing technologies such as precision sensors and broadband frequency combs requires ultra low-loss and low-dispersion components, which have so far remained elusive in this regime. Here, we use native germanium to demonstrate the first high-quality microresonators in the LWIR. These microresonators are coupled to partially-suspended Ge waveguides on a separate glass chip, allowing for the first unambiguous measurements of isolated linewidths. At 8 μm, we measured losses of 0.5 dB/cm and intrinsic quality (Q) factors of 2.5 × 105, nearly two orders of magnitude higher than prior LWIR resonators. Our work portends the development of novel sensing and nonlinear photonics in the LWIR regime.

Suggested Citation

  • Dingding Ren & Chao Dong & Sadhvikas J. Addamane & David Burghoff, 2022. "High-quality microresonators in the longwave infrared based on native germanium," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32706-1
    DOI: 10.1038/s41467-022-32706-1
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    References listed on IDEAS

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    1. Gustavo S. Wiederhecker & Long Chen & Alexander Gondarenko & Michal Lipson, 2009. "Controlling photonic structures using optical forces," Nature, Nature, vol. 462(7273), pages 633-636, December.
    2. D. K. Armani & T. J. Kippenberg & S. M. Spillane & K. J. Vahala, 2003. "Ultra-high-Q toroid microcavity on a chip," Nature, Nature, vol. 421(6926), pages 925-928, February.
    3. Andreas Hugi & Gustavo Villares & Stéphane Blaser & H. C. Liu & Jérôme Faist, 2012. "Mid-infrared frequency comb based on a quantum cascade laser," Nature, Nature, vol. 492(7428), pages 229-233, December.
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    Cited by:

    1. Dmitry Kazakov & Theodore P. Letsou & Maximilian Beiser & Yiyang Zhi & Nikola Opačak & Marco Piccardo & Benedikt Schwarz & Federico Capasso, 2024. "Active mid-infrared ring resonators," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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