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17 March 2023 Frequency response of patch-array QWIP photodetectors up to 220 GHz via mid-infrared photomixing
Quyang Lin, Michael Hakl, Jean-François Lampin, Wenjian Wan, J. C. Cao, Hua Li, Emilien Peytavit, Stefano Barbieri
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Proceedings Volume PC12430, Quantum Sensing and Nano Electronics and Photonics XIX; PC124300R (2023) https://doi.org/10.1117/12.2649786
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
We report the room-temperature frequency response, in the range 0-220GHz, of GaAs-based QWIP photodetectors operating at 10um. Detectors rely on 2D arrays of patch-antennas, connected to an integrated 50-Ohm coplanar line allowing on-wafer characterization. By difference frequency mixing of two QCLs, we obtain a RF 3dB bandwidth of ~90GHz. The frequency response of devices based on 4 antennas is compatible with a carrier capture-time of ~2.5ps. By replacing the coplanar line with a log-spiral antenna we also demonstrate devices radiating directly in free-space. The perspective of exploiting the latter as QCL-pumped photomixers for the generation of microwave/sub-mm radiation is discussed.
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Quyang Lin, Michael Hakl, Jean-François Lampin, Wenjian Wan, J. C. Cao, Hua Li, Emilien Peytavit, and Stefano Barbieri "Frequency response of patch-array QWIP photodetectors up to 220 GHz via mid-infrared photomixing", Proc. SPIE PC12430, Quantum Sensing and Nano Electronics and Photonics XIX, PC124300R (17 March 2023); https://doi.org/10.1117/12.2649786
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KEYWORDS
Photodetectors
Quantum well infrared photodetectors
Antennas
Mid-IR
Electron beam lithography
Microwave radiation
Quantum cascade lasers
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