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The longwave infrared (LWIR) region of the spectrum spans 8 to 14 {\mu}m andenables high-performance sensing and imaging for detection, ranging, andmonitoring. Chip-scale integrated LWIR photonics has enormous potential forreal-time environmental monitoring, explosive detection, and biomedicine.However, realizing advanced technologies such as precision sensors andbroadband frequency combs requires ultra low-loss components, which have so farremained elusive in this regime. We demonstrate that non-epitaxial germanium isan enabling technology for longwave infrared integrated photonics, using it todemonstrate the first high quality (Q) factor whispering gallery modemicroresonators in the LWIR, which we couple to integrated low-loss waveguides.At 8 {\mu}m, we measure losses of 0.5 dB/cm and intrinsic Q factors of2.5x10^5, nearly two orders of magnitude higher than prior LWIR resonators. Ourwork portends the development of integrated sensing and nonlinear photonics inthe LWIR regime.

High-Q longwave infrared microresonators based on a non-epitaxial germanium platform