FIR quantum cascade lasers at λ > 20 μm and THz emitters at λ = 80 μm

R. Colombelli, F. Capasso, A. Straub, C. Gmachl, M. I. Blakey, A. M. Sergent, D. L. Sivco, A. Y. Cho, K. W. West, L. N. Pfeiffer

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Quantum cascade lasers operating at λ > 20 μm wavelength are reported. Pulsed operation was obtained up to 140 K with a peak power of few milliwatts at cryogenic temperatures. Laser action originates from interminiband transitions in "chirped" superlattice active regions. The waveguides are based on surface-plasmon modes confined at a metal-semiconductor interface, but we also report on a 21.5 μm wavelength laser based on a double-sided interface-plasmon waveguide. This latter, contrary to the single-sided surface plasmon, is a viable waveguiding solution in the THz range, i.e. at wavelengths between 60 and 100 μm. Finally, intersubband electroluminescence is reported in a quantum cascade structure based on asymmetric superlattice active regions and designed for emission in the THz range at λ ≈ 80 μm.

Original languageEnglish (US)
Pages (from-to)848-853
Number of pages6
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number2-4
StatePublished - Mar 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


  • Semiconductor laser
  • Stimulated emission


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