Coherent terahertz emission from cavity polaritons in semiconductor microcavities

Summary form only given. The appearance of Rabi oscillations in the time domain in semiconductor microcavities (MC) has long been established ever since the first time-resolved reflection measurement from such samples. In these experiments, a short laser pulse excites the Rabi split exciton polariton and then some optical property is measured as a function of time (four wave mixing, reflectivity, etc). In this work we directly measure the electromagnetic emission due to time-dependent Rabi oscillations. This is the first time, to our knowledge, that terahertz (THz) photons emitted, due to a dipole transition between exciton polaritons embedded in a microcavity, have been observed.