Influences of oxygen vacancies on the enhanced nonlinear optical properties of confined ZnO quantum dots
Influences of oxygen vacancies on the enhanced nonlinear optical properties of confined ZnO quantum dots
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氧空位对限域ZnO量子点增强非线性光学性能的影响
DOI：
10.1016/j.jallcom.2017.12.250
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发表时间：
2018-03-30
影响因子：
6.2
通讯作者：
Luo, Xingfang
中科院分区：
文献类型：
--
作者：
Peng, Yuhui;Wang, Gang;Luo, Xingfang
将ZnO量子点限制在固态基质中形成纳米复合材料是设计非线性光学器件的重要手段。本文采用脉冲激光沉积法和快速热退火技术制备了Al_2O_3基体中的ZnO。在N-2退火的ZnO量子点中产生了大量的氧空位。磁性测量结果表明，限制在Al 2 O3基质中的ZnO量子点的铁磁性质可能是由于氧空位。N-2退火的ZnO量子点的双光子吸收是一个瞬时的非线性过程，与O-2退火的ZnO量子点相比，其双光子吸收增强了近2倍。在具有大量氧空位的受限ZnO量子点中实现光学非线性的增强对于ZnO纳米结构在诸如光限幅器件和全光开关元件中的实际应用是重要的。(c)2017 Elsevier B. V.版权所有。
Confining ZnO quantum dots (QDs) into a solid state matrix to form nanocomposite materials is an important mean to design nonlinear optical devices. In this paper, ZnO confined in Al2O3 matrix are synthesized by pulsed laser deposition method and rapid thermal annealing technique. The substantial oxygen vacancies are generated in the N-2-annealed ZnO QDs. Magnetic measurements illustrate that the ferromagnetic nature of ZnO QDs confined in Al2O3 matrix can be due to the oxygen vacancies. The determined two-photon absorption in N-2-annealed ZnO QDs is an instantaneous nonlinear process and is enhanced almost 2 times compared to that of O-2-annealed ZnO QDs. The enhancement of optical nonlinearities achieved in confined ZnO QDs with substantial oxygen vacancies is important for the practical applications of ZnO nanostructures in such as optical limiting devices and all-optical switching elements. (c) 2017 Elsevier B.V. All rights reserved.