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Title: Room-temperature, wide-band, quantum well infrared photodetector for microwave optical links at 4.9 μm wavelength
Authors: Rodriguez, Etienne
Mottaghizadeh, Alireza
Gacemi, Djamal
Palaferri, Daniele
Asghari, Zahra
Jeannin, Mathieu
Vasanelli, Angela
Bigioli, Azzurra
Todorov, Yanko
Beck, Mattias
Faist, Jerome
Wang, Qi Jie
Sirtori, Carlo
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Rodriguez, E., Mottaghizadeh, A., Gacemi, D., Palaferri, D., Asghari, Z., Jeannin, M., ... Sirtori, C. (2018). Room-temperature, wide-band, quantum well infrared photodetector for microwave optical links at 4.9 μm wavelength. ACS Photonics, 5(9), 3689-3694. doi:10.1021/acsphotonics.8b00704
Journal: ACS Photonics
Abstract: 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 × 107 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.
ISSN: 2330-4022
DOI: 10.1021/acsphotonics.8b00704
Schools: School of Electrical and Electronic Engineering 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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