Electron-Photon Strong Coupling in Intersubband Resonators

We have designed and successfully fabricated an AlAs/AlGaAs microcavity resonator tuned to the intersubband electronic transition of an embedded modulation-doped GaAs/AlGaAs multiple quantum well system. Optimisation of the structure design and of the growth protocol yielded a perfectly tuned system, which shows electron-photon strong coupling, manifested by a Rabi splitting of 15meV at 10K.