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[Stage/Thèse] Nouvel infrared quantum detectors

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Stage de Master 2 qui débouche sur une thèse pour l’année 2017-2018

Nouvel infrared quantum detectors

Person in charge of the internship : Yanko Todorov
Tel : 0157276990
e-mail : yanko.todorov@univ-paris-diderot.fr

Scientific project :
The Mid-Infrared (MIR) and TeraHertz (THz) frequency domains (3μm < l < 300μm) have a tremendous amount of applications, such as molecular spectroscopy, thermal imaging, environmental control, medical and security imaging, point to point communications and data transmission. All these applications would benefit greatly from compact, fast, sensitive and possibly high-temperature operating detectors.
Semiconductor quantum wells, such as GaAs/AlGaAs, constitute a perfect tehnological platform for infrared detectors, as their electronic transitions can be tuned in the whole infrared spectral range simply by changing the width of the well [1]. However, one of the major drawback of these systems is the thermally induced
dark current, which increases exponentially with temperature. As a result infrared quantuim detectors require cooling at cryogenic temperatures, typically at 70K (liquid Nitrogen) for MIR detectors and 4K (liquid Helium) for THz detectors.

In the QUAD team of MPQ we recently developped a new device architecture [2,3], where the quantum wells are embeded into metallic patch antennas
(Figure, left).

quantum wells are embeded into metallic patch antennas
quantum wells are embeded into metallic patch antennas
New resonator geometries
New resonator geometries

This sructure acts both as a microcavity, allowing for a strong local field enhancement, and an antenna which collects photons form an area much
larger than the device itself. The antenna effects allows thus a strong reduction of the dark current, which allowed us observing for the first time room temperature
operation of a MIR quantum detector [3]. The aim of the current project is to extend further this study to novel type of devices, such two-photon detectors and multispectral detectors, as well as to explore the heterodyne detection mode [3]. We will also explore new resonator geometries, inspired from circuits and
metamaterials (Figure, right), which allow even further reduction of the dark current [4].

[1] H.C. Liu in Intersubband Transitions in Quantum Wells : Physics and Device Applications I Semiconductors and Semimetals
62 (2000) (H. C. Liu, F. Capasso ed.)
[2] D. Palaferri, et al., Appl. Phys. Lett. 106, 161102 (2015)
[3] D. Palaferri,et al. arXiv:1709.01898 (2017)
[4] D. Palaferri et al. New J. Phys. 18 113016 (2016)

Methods and techniques : Mid and far infrared spectroscopy, transport measurements
Possibility to go on with a PhD ? Yes
Envisaged fellowship ? ED

Nouvel infrared quantum detectors