Short-wavelength (λ<2 μm) intersubband absorption dynamics in ZnSe/BeTe quantum wells

被引：16
|
作者：
Akimoto, R [1 ]
Akita, K [1 ]
Sasaki, F [1 ]
Kobayashi, S [1 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, Photon Res Inst, Tsukuba, Ibaraki 3058568, Japan
来源：
APPLIED PHYSICS LETTERS | 2002年 / 80卷 / 14期
关键词：
D O I：
10.1063/1.1468261
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report on linear and nonlinear short-wavelength (lambda<2 μm) 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/cm(2) at λ=1.76 μm. 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. (C) 2002 American Institute of Physics.
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收藏
页码：2433 / 2435
页数：3
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