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.

引用

页码：2433 / 2435

页数：3

共 13 条

[1] Short-wavelength intersubband transitions down to 1.6 μm in ZnSe/BeTe type-II superlattices [J].

Akimoto, R ;

Kinpara, Y ;

Akita, K ;

Sasaki, F ;

Kobayashi, S .

APPLIED PHYSICS LETTERS, 2001, 78 (05) :580-582

[2] Nonlinearity and recovery time of 1.55μm intersubband absorption in InGaAs/AlAs/AlAsSb coupled quantum wells [J].

Akiyama, T ;

Georgiev, N ;

Mozume, T ;

Yoshida, H ;

Gopal, AV ;

Wada, O .

ELECTRONICS LETTERS, 2001, 37 (02) :129-130

[3] Pump and probe measurement of intersubband relaxation time in short-wavelength intersubband transition [J].

Asano, T ;

Noda, S ;

Tomoda, K .

APPLIED PHYSICS LETTERS, 1999, 74 (10) :1418-1420

[4] Intersubband relaxation time for InxGa1-xAs/AlAs quantum wells with large transition energy [J].

Ghislotti, G ;

Riedo, E ;

Ielmini, D ;

Martinelli, M .

APPLIED PHYSICS LETTERS, 1999, 75 (23) :3626-3628

[5] Sub-picosecond electron scattering time for λ ≃ 1.55μm intersubband transitions in GaN/AlGaN multiple quantum wells [J].

Gmachl, C ;

Frolov, SV ;

Ng, HM ;

Chu, SNG ;

Cho, AY .

ELECTRONICS LETTERS, 2001, 37 (06) :378-380

[6] Large improvement in intersubband saturation intensity in InGaAs/AlAsSb quantum well [J].

Gopal, AV ;

Yoshida, H ;

Neogi, A ;

Mozume, T ;

Georgiev, N ;

Simoyama, T ;

Wada, O ;

Ishikawa, H .

ELECTRONICS LETTERS, 2001, 37 (20) :1265-1267

[7] Ultrafast intersubband relaxation (≤150 fs) in AlGaN/GaN multiple quantum wells [J].

Iizuka, N ;

Kaneko, K ;

Suzuki, N ;

Asano, T ;

Noda, S ;

Wada, O .

APPLIED PHYSICS LETTERS, 2000, 77 (05) :648-650

[8] Intersubband absorption dynamics in coupled quantum wells [J].

Müller, T ;

Bratschitsch, R ;

Strasser, G ;

Unterrainer, K .

APPLIED PHYSICS LETTERS, 2001, 79 (17) :2755-2757

[9] Band structure of BeTe: A combined experimental and theoretical study [J].

Nagelstrasser, M ;

Droge, H ;

Steinruck, HP ;

Fischer, F ;

Litz, T ;

Waag, A ;

Landwehr, G ;

Fleszar, A ;

Hanke, W .

PHYSICAL REVIEW B, 1998, 58 (16) :10394-10400

[10] ELECTRON-SCATTERING BY CONFINED LO POLAR PHONONS IN A QUANTUM WELL [J].

RIDLEY, BK .

PHYSICAL REVIEW B, 1989, 39 (08) :5282-5286

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

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