Abstract
We report the realization of a GaAs/AlGaAs quantum-cascade terahertz emitter capable of emitting at two entirely different frequencies from the same structure. This is realized through judicious wavefunction engineering of the relevant electronic states. Emission is observed at 6.32 meV (1.5 THz) and 12.18 meV (2.9 THz) with full width at half maximum of 0.72 meV and 0.58 meV, respectively, at T=10 K. The structure consisted of 40 periods of the quantum-cascade module. Emission occurred between two sets of distinct energy levels that came into the desired configuration at different biases due to the quantum-confined Stark effect. Higher-energy AlAs-like phonons were utilized for the depopulation mechanism.
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