Field enhancement of multiphoton induced luminescence processes in ZnO nanorods

被引：5

作者：

Hyyti, Janne ^{[1
]}

Perestjuk, Marko ^{[1
]}

Mahler, Felix ^{[1
]}

Grunwald, Rudiger ^{[1
]}

Guell, Frank ^{[2
]}

Gray, Ciaran ^{[3
]}

McGlynn, Enda ^{[3
]}

Steinmeyer, Gunter ^{[1
]}

机构：

[1] Max Born Inst Nonlinear Opt & Short Pulse Spect, Max Born Str 2a, D-12489 Berlin, Germany

[2] Univ Barcelona, Dept Elect, C Marti & Franques 1, E-08028 Barcelona, Catalunya, Spain

[3] Dublin City Univ, Natl Ctr Plasma Sci & Technol, Sch Phys Sci, Dublin 9, Ireland

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2018年 / 51卷 / 10期

基金：

欧盟第七框架计划;

关键词：

nanorods; photoluminescence; nonlinear optics; ULTRAFAST CARRIER DYNAMICS; 2ND-HARMONIC GENERATION; HARMONIC-GENERATION; EXCITATION; COMPETITION; EMISSION; NANOWIRE; EXCITON; OPTICS; SINGLE;

D O I：

10.1088/1361-6463/aaaabe

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The near-ultraviolet photoluminescence of ZnO nanorods induced by multiphoton absorption of unamplified Ti: sapphire pulses is investigated. Power dependence measurements have been conducted with an adaptation of the ultrashort pulse characterization method of interferometric frequency-resolved optical gating. These measurements enable the separation of second harmonic and photoluminescence bands due to their distinct coherence properties. A detailed analysis yields fractional power dependence exponents in the range of 3-4, indicating the presence of multiple nonlinear processes. The range in measured exponents is attributed to differences in local field enhancement, which is supported by independent photoluminescence and structural measurements. Simulations based on Keldysh theory suggest contributions by three-and four-photon absorption as well as avalanche ionization in agreement with experimental findings.

引用

页数：11

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