Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-08-25
APL 83, 2506 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
in press APL, tentative publication date 29 Sep 2003
Scientific paper
10.1063/1.1614440
In a recent Letter [Appl. Phys. Lett. 82, 1015 (2003)], Williams et al. reported the development of a terahertz quantum cascade laser operating at 3.4 THz or 14.2 meV. We have calculated and analyzed the gain spectra of the quantum cascade structure described in their work, and in addition to gain at the reported lasing energy of ~= 14 meV, we have discovered substantial gain at a much lower energy of around 5 meV or just over 1 THz. This suggests an avenue for the development of a terahertz laser at this lower energy, or of a two-color terahertz laser.
Lee Shih-Chang
Wacker Andreas
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