Aniela Dunn, C. Poyser, P. Dean, Aleksandar Demić, A. Valavanis, D. Indjin, M. Salih, I. Kundu, Lianhe H. Li, A. Akimov, G. Davies, E. Linfield, J. Cunningham, A. Kent
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High-Speed Modulation of a Terahertz Quantum Cascade Laser Using Coherent Acoustic Phonon Pulses
We demonstrate a new method for high-speed modulation of terahertz emission and electronic transport of a Ga(Al)As quantum cascade laser using coherent acoustic phonon pulses. The modulation, which is on the order of 6%, can be partially explained by a perturbation-theory analysis. The < 1 ns rise time of the modulation is dominated by parasitic device impedance in our experiment, however, the fast transit of phonons through the QCL heterostructure imply modulation rates > 100 GHz are possible.
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