Three-photon-induced four-photon absorption and nonlinear refraction in ZnO quantum dots

被引：23

作者：

Chattopadhyay, M. ^{[1
]}

Kumbhakar, P. ^{[1
]}

Tiwary, C. S. ^{[1
]}

Mitra, A. K. ^{[1
]}

Chatterjee, U. ^{[2
]}

Kobayashi, T. ^{[3
,4
,5
]}

机构：

[1] Natl Inst Technol, Dept Phys, Durgapur 713209, India

[2] Univ Burdwan, Laser Lab, Dept Phys, Burdwan 713104, W Bengal, India

[3] Univ Electrocommun, Dept Appl Phys & Chem, Chofu, Tokyo 1828585, Japan

[4] Univ Electrocommun, Inst Laser Sci, Chofu, Tokyo 1828585, Japan

[5] Japan Sci & Technol Agcy, Ultrashort Pulse Laser Project, Int Cooperat Res Project, Saitama, Japan

来源：

OPTICS LETTERS | 2009年 / 34卷 / 23期

关键词：

EXCITED-STATE ABSORPTION; OPTICAL NONLINEARITIES; NANOPARTICLES;

D O I：

10.1364/OL.34.003644

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Three-photon-induced four-photon absorption via excited-state absorption and self-defocusing nonlinear refraction are reported for the first time, to our knowledge, in ZnO quantum dots with average sizes of 2.0 +/- 0.1 nm with 1064 nm radiation from a Q-switched Nd:YAG laser at a peak intensity of 2.5 GW/cm(2). By employing the three-level two-step model, the experimental results can be explained quite satisfactorily. (C) 2009 Optical Society of America

引用

页码：3644 / 3646

页数：3

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