Importance of interface roughness induced intersubband scattering in mid-infrared quantum cascade lasers

Yenting Chiu, Yamac Dikmelik, Peter Q. Liu, Nyan L. Aung, Jacob B. Khurgin, Claire F. Gmachl

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

The electron transit time of many different quantum cascade lasers has been measured and compared to the calculated upper laser level lifetimes with and without taking into account interface roughness induced intersubband scattering. A significantly better correlation is found between the experimental results and the calculation when including the contribution from the interface roughness (corr. coeff.: 0.79 vs. 0.43 with and without the consideration of interface roughness, respectively). This suggests that in addition to longitudinal optical phonons, interface roughness is also crucial in determining the intersubband lifetimes in mid-infrared quantum cascade laser and should routinely be included in design.

Original languageEnglish (US)
Article number171117
JournalApplied Physics Letters
Volume101
Issue number17
DOIs
StatePublished - Oct 22 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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