Room-Temperature, Wide-Band, Quantum Well Infrared Photodetector for Microwave Optical Links at 4.9 μm Wavelength - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue ACS photonics Année : 2018

Room-Temperature, Wide-Band, Quantum Well Infrared Photodetector for Microwave Optical Links at 4.9 μm Wavelength

Zahra Asghari
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Mattias Beck
Jérôme Faist
Qi Jie Wang

Résumé

High-speed, room-temperature, quantum well infrared photodetectors (QWIPs) at λ ∼ 4.9 μm have been realized in a strain compensated In0.1Ga0.9As/Al0.4Ga0.6As heterostructure grown on a GaAs substrate. The high-speed properties at room temperature have been optimized by using a specifically designed air-bridge structure, which greatly reduces the time constant of the effective RC circuit, thus, allowing transmission and detection of high-frequency signals. By modulating a high-speed quantum cascade laser (QCL) centered at λ ∼ 4.7 μm, we were able to record a modulation of the photocurrent up to ∼26 GHz, which is limited by our setup. At 300 K and under a bias voltage of −5 V our device shows high responsivity and detectivity of 100 mA/W and 1 × 10^7 Jones, respectively. The developed high-performance QWIPs at this wavelength are highly promising for optical heterodyne measurement, high-speed free space communications in microwave optical links and frequency comb QCLs characterisations.
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Dates et versions

hal-02508667 , version 1 (20-11-2022)

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Etienne Rodriguez, Alireza Mottaghizadeh, Djamal Gacemi, Daniele Palaferri, Zahra Asghari, et al.. Room-Temperature, Wide-Band, Quantum Well Infrared Photodetector for Microwave Optical Links at 4.9 μm Wavelength. ACS photonics, 2018, 5 (9), pp.3689-3694. ⟨10.1021/acsphotonics.8b00704⟩. ⟨hal-02508667⟩
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