Journal
NATURE COMMUNICATIONS
Volume 13, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-32706-1
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Funding
- Research Council of Norway through the FRINATEK Program [302923]
- FRIPRO Mobility Fellowship, Research Council of Norway
- AFOSR [FA9550-20-1-0192]
- NSF [ECCS-2046772]
- ONR [N00014-21-1-2735]
- Gordon and Betty Moore Foundation [GBMF11446]
- U.S. DOE's National Nuclear Security Administration [DE-NA-0003525]
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High-quality microresonators in the LWIR have been demonstrated using native germanium, paving the way for the development of novel sensing and nonlinear photonics in this regime.
The longwave infrared (LWIR) region of the spectrumspans 8 to 14 mu m 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 mu m, we measured losses of 0.5 dB/cm and intrinsic quality (Q) factors of 2.5 x 10(5), 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.
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