Abstract
We report far-infrared emission from coupled plasmons in a parabolically graded AlGaAs/GaAs single quantum well driven by an inplane electric field. A magnetic field tilted at different angles with respect to the sample's growth axis is applied to couple the intersubband resonance to the cyclotron resonance. The measured mode dispersion shows an anticrossing as calculated in a simple centre of mass picture and confirms the Kohn theorem. For measured optical powers up to 10-7 W temperatures of the hot electron gas up to 70 K are found. At inplane magnetic fields a small satellite peak indicates deviations from ideal parabolicity.
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