Non-linear optical deformation potentials in uniaxially strained ZnO microwires
Non-linear optical deformation potentials in uniaxially strained ZnO microwires
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DOI：
10.1063/1.4975677
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发表时间：
2017-02-06
影响因子：
4
通讯作者：
Grundmann, M.
中科院分区：
文献类型：
--
作者：
Sturm, C.;Wille, M.;Grundmann, M.
用阴极发光光谱法系统研究了直径为1.5 ~ 7.3 μ m的弯曲ZnO微线在约10 K温度下的发射特性。我们沿c轴诱导了高达+/- 2.9%的单轴应变。在这些高应变值下，我们观察到发射能量相对于诱导应变的非线性位移，并且能量位移的大小取决于应变的符号。线性和非线性变形势分别为D-1 = -2.50 +/- 0.05 eV和D-2 = -15.0 +/- 0.5 eV。能量位移的非线性也反映在发射峰的光谱展宽上，它作为局部诱发应变的函数，随着压缩侧应变的增加而减小，而随着拉伸侧应变的增加而增大。AIP出版社出版。
The emission properties of bent ZnO microwires with diameters ranging from 1.5 mu m to 7.3 mu m are systematically investigated by cathodoluminescence spectroscopy at T approximate to 10 K. We induced uniaxial strains along the c-axis of up to +/- 2.9%. At these high strain values, we observe a nonlinear shift of the emission energy with respect to the induced strain, and the magnitude of the energy shift depends on the sign of the strain. The linear and non-linear deformation potentials were determined to be D-1 = -2.50 +/- 0.05 eV and D-2 = -15.0 +/- 0.5 eV, respectively. The non-linearity of the energy shift is also reflected in the observed spectral broadening of the emission peak as a function of the locally induced strain, which decreases with increasing strain on the compressive side and increases on the tensile side. Published by AIP Publishing.