Optical characterization of intersubband transitions in Zn xCd 1-xSe/Zn x′Cd y′Mg 1- x′- y′Se multiple quantum well structures by contactless electroreflectance

H. Lu, A. Shen, W. Charles, I. Yokomizo, M. C. Tamargo, K. J. Franz, Claire F. Gmachl, M. Mũoz

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Abstract

Contactless electroreflectance was measured at room temperature to characterize a wide range of the possible optical transitions in Znx Cd1-x Se Zn x′ Cd y′ Mg1- x′ - y′ Se multi-quantum-well structures grown by molecular beam epitaxy. Based on these measurements, the authors predict and then verify the anticipated intersubband transition energies. They investigate a representative Zn0.5 Cd0.5 Se Zn0.20 Cd0.19 Mg0.61 Se structure, for which the E1-E2 transition energy is predicted to be 178 meV (6.97 μm). Intersubband absorption using Fourier transform infrared spectroscopy exhibits a peak at 180 meV (6.89 μm), in excellent agreement with the contactless electroreflectance measurements.

Original languageEnglish (US)
Article number241921
JournalApplied Physics Letters
Volume89
Issue number24
DOIs
StatePublished - Dec 29 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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