Short-wavelength (λ<2 μm) intersubband absorption dynamics in ZnSe/BeTe quantum wells
- 2 April 2002
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 80 (14), 2433-2435
- https://doi.org/10.1063/1.1468261
Abstract
We report on linear and nonlinear short-wavelength (λ<2 μ m ) intersubband (ISB) absorption characteristics in ZnSe/BeTe quantum wells by means of an interband pump and ISB pump/probe technique. The ISB absorption saturates with a hole burning effect, indicating the absorption band is broadened inhomogeneously. The saturation intensity is as low as 4.3 MW/cm2 at λ=1.76 μ m . The direct ISB energy relaxation time increases gradually from 0.20 to 0.38 ps with decreasing λ from 2.2 to 1.8 μm, while the saturation recovery is replaced by another slow relaxation process with a time constant of a few ps. The Γ( ZnSe )–X( BeTe ) electron transfer is a relevant mechanism for this slow relaxation.Keywords
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