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Ultrafast quantum-well photodetectors operating at 10µm with flat frequency response up to 70GHz at room temperature

Abstract : III-V semiconductor mid-infrared photodetectors based on intersubband transitions hold a great potential for ultra-high-speed operation up to several hundreds of GHz. In this work we exploit a ~350nm-thick GaAs/Al0.2Ga0.8As multi-quantum-well heterostructure to demonstrate heterodyne detection at l~10µm with a nearly flat frequency response up to 70GHz at room temperature, solely limited by the measurement system bandwidth. This is the broadest RFbandwidth reported to date for a quantum-well mid-infrared photodetector. Responsivities of 0.15A/W and 1.5A/W are obtained at 300K and 77K respectively. To allow ultrafast operation and illumination at normal incidence, the detector consists of a 50W coplanar waveguide, monolithically integrated with a 2D-array of sub-wavelength patch antennas, electrically interconnected by suspended wires. With this device architecture we obtain a parasitic capacitance of ~30fF, corresponding to the static capacitance of the antennas, yielding a RClimited 3dB cutoff frequency >150GHz at 300K, extracted with a small-signal equivalent circuit model. Using this model, we quantitively reproduce the detector frequency response and find intrinsic roll-off time constants as low as 1ps at room temperature.
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https://hal.archives-ouvertes.fr/hal-03097106
Contributor : Stefano Barbieri <>
Submitted on : Tuesday, January 5, 2021 - 11:26:07 AM
Last modification on : Tuesday, May 4, 2021 - 8:15:12 PM
Long-term archiving on: : Wednesday, April 7, 2021 - 9:23:29 AM

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M Hakl, Q Lin, Sylvie Lepilliet, M Billet, J-F Lampin, et al.. Ultrafast quantum-well photodetectors operating at 10µm with flat frequency response up to 70GHz at room temperature. ACS photonics, American Chemical Society,, 2021, 8 (2), pp.464-471. ⟨10.1021/acsphotonics.0c01299⟩. ⟨hal-03097106⟩

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