High-Q microresonators based on native germanium for precision sensing

Dingding Ren; Chao Dong; Sadhvikas Addamane; David Burghoff

doi:10.1117/12.2657256

21 March 2023 High-Q microresonators based on native germanium for precision sensing

Dingding Ren, Chao Dong, Sadhvikas Addamane, David Burghoff

Proceedings Volume 12447, Quantum Sensing, Imaging, and Precision Metrology; 1244705 (2023) https://doi.org/10.1117/12.2657256
Event: SPIE Quantum West, 2023, San Francisco, California, United States

Abstract

We will present our recent work on achieving a high-quality factor (Q) in microresonators operating in the longwave infrared (LWIR) range of 8 to 14 microns.1 Advances in this area have the potential to drive new developments in integrated non-linear optics and chip-based sensing, due to the availability of powerful integrated light sources such as solid-state quantum cascade lasers and strong demand for sensing applications in the LWIR atmospheric transparency window. However, until recently limitations in low-loss materials and fabrication processes have resulted in Q factors that are only several thousand. We will discuss the use of germanium as a high-quality material and heterogeneous fabrication process that produces ultra-smooth surfaces. By coupling the output of a QCL into a partially suspended Ge-on-glass waveguide, we were able to achieve an intrinsic Q of 2.5 ×10⁵. Our results demonstrate the importance and potential of using high-quality native materials for integrated photonics in the LWIR range and portends new sensor topologies.

Citation Download Citation

Dingding Ren, Chao Dong, Sadhvikas Addamane, and David Burghoff "High-Q microresonators based on native germanium for precision sensing", Proc. SPIE 12447, Quantum Sensing, Imaging, and Precision Metrology, 1244705 (21 March 2023); https://doi.org/10.1117/12.2657256

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KEYWORDS

Microresonators

Germanium

Waveguides

Whispering gallery modes

Long wavelength infrared

Glasses

Quantum cascade lasers

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