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

Vincenzo Spagnolo, Gaetano Scamarcio, Mariano Troccoli, Federico Capasso, Claire Gmachl, A. Michael Sergent, Albert L. Hutchinson, Deborah L. Sivco, Alfred Y. Cho

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)4303-4305
Number of pages3
JournalApplied Physics Letters
Volume80
Issue number23
DOIs
StatePublished - Jun 10 2002

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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