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

Dingding Ren (), Chao Dong, Sadhvikas J. Addamane and David Burghoff
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Dingding Ren: University of Notre Dame
Chao Dong: University of Notre Dame
Sadhvikas J. Addamane: Sandia National Laboratories
David Burghoff: University of Notre Dame

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-32706-1

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