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email: mathieu.jeannin@c2n.upsaclay.fr 
Phone: +33 (0)1 70 27 03 93

I obtained my MSc in Optics and Photonics from Imperial College and my Engineering degree from Supélec. I defended my PhD in 2016, in the joint team Nanophysics and Semiconductors between Institut Néel (CNRS) and INAC (CEA) in Grenoble, where I studied the optical emission properties of II-VI semiconductor quantum dots embedded inside nanowires, and the opportunity to control these properties using plasmonic nanoantennas. For this work, I was awarded the Nanoscience Foundation Thesis Prize in 2017.

I joined the Laboratoire Matériaux et Phénomènes Quantiques (MPQ) in 2017, and then the Laboratoire de Physique de l’École Normale Supérieure (LPENS) in 2019. My work focused on developing a three-dimensional metallic metamaterial architecture to enhance the optoelectronic response of intersubband transitions in doped GaAs quantum wells resonating at THz frequencies. I demonstrated the ultra-strong coupling between the electron gas and the meta-atoms, funneling incident radiation into an ultra-subwavelength volume of 10^-6λ³. Using this architecture I demonstrated THz QWIP detectors operating up to 60 K, setting a path towards THz photodetectors operating at liquid nitrogen temperature.

In 2020, I joined the Centre Nanosciences et Nanotechnologies (C2N) as a postdoctoral researcher, focusing on novel mid-infrared optoelectronic devices operating in the strong coupling regime between light and matter. In particular, I studied quantum cascade detectors operating in the strong coupling regime to advance towards a description of electronic transport in polaritonic systems. I also started studying nonlinearities in intersubband polaritonic devices, starting from a unified description of saturation and bistability of intersubband transitions in the weak and strong light-matter coupling regimes, opening the way towards mid-infrared saturable absorbers.

In 2022 I joined the CNRS to continue this research line. I develop new photonic architecture to harvest the non-linear reponse of intersubband transitions to develop new mid-infrared optoelectronic devices, focusing e.g. on saturable absorbers and modulators. I also work on more fundamental non-linearities of intersubband polaritons.

Research activity: Mir-THz devices

Research identifiers: Google Scholar | ORCID | CV HAL | Researchgate