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Terahertz spectroscopy experiments at magnetic fields and low temperatureswere carried out on samples of different gate shapes processed on a highelectron mobility GaAs/AlGaAs heterostructure. For a given radiation frequency,multiple magnetoplasmon resonances were observed with a dispersion relationdescribed within a local approximation of the magnetoconductivity tensor. Thesecond harmonic of the cyclotron resonance was observed and its appearance wasinterpreted as resulting from a high frequency, inhomogeneous electromagneticfield on the border of a two-dimensional electron gas with a metallic gateand/or an ohmic contact.

The photoresponse of a two-dimensional electron gas at the second harmonic of the cyclotron resonance