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Nonequilibrium optical phonon generation by steady-state electron transport in quantum-cascade lasers

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9 Author(s)
Spagnolo, Vincenzo ; Dipartimento Interateneo di Fisica, INFM, Università e Politecnico di Bari, via Amendola 173, 70126 Bari, Italy ; Scamarcio, Gaetano ; Troccoli, Mariano ; Capasso, F.
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Observation of the nonequilibrium optical phonons population associated with electron transport in quantum-cascade lasers is reported. The phonon occupation number was measured in the range 75–280 K by using a combination of microprobe photoluminescence and Stokes/anti-Stokes Raman spectroscopy. The excess phonon population is observed to decrease as the lattice temperature increases. From the nonequilibrium phonon population, we extracted interface phonon lifetimes of 5 ps at 75 K and 2 ps at 280 K. © 2002 American Institute of Physics.

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Applied Physics Letters  (Volume:80 ,  Issue: 23 )