Quantum Well Infrared Detectors In The Strong Light-Matter Coupling Regime

We report quantum well mid-infrared photodetectors operating in the strong light-matter coupling regime. It is an ideal system to elucidate the elusive problem of the injection of electrons (single-particles) into polaritonic modes (bosonic excitations). We have obtained experimental information on the transfer function between a polaritonic system and an electronic reservoir. This approach opens promising avenues in view of adding previously unavailable functionalities to quantum well detectors (mid-IR and THz) and improving their performance.