Intersubband absorption in GaN/AlGaN multiple quantum wells in the wavelength range of [formula omitted]

Claire F. Gmachl, Hock M. ng, Alfred Y. Cho

Research output: Contribution to journalArticle

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Abstract

Intersubband optical absorption in narrow, 15–30 Å wide, GaN/AlGaN quantum wells has been measured. The samples were grown by molecular-beam epitaxy on sapphire substrate and the barrier AlN mole fraction was varied from 0.45 to 0.8. Peak absorption wavelengths ranged from 4.2 μm for 30 Å wide wells to 1.77 μm for a 15 Å wide well. Modeling shows that a large contribution to the considerable spectral width of the absorption of ∼150 meV likely results from monolayer fluctuations. In addition to the composition dependent band offset, the intrinsic electric fields in the wells and barriers are the determining factors for the shortest possible wavelength.

Original languageEnglish (US)
Pages (from-to)334-336
Number of pages3
JournalApplied Physics Letters
Volume77
Issue number3
DOIs
StatePublished - Jul 17 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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