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

✍ Scribed by 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

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
198 KB
Volume
13
Category
Article
ISSN
1386-9477

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✦ Synopsis

Quantum cascade lasers operating at ¿ 20 m 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 conÿned at a metal-semiconductor interface, but we also report on a 21:5 m 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 m. 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 ≈ 80 m.

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