Homoepitaxial nonpolar (10-10) ZnO/ZnMgO monolithic microcavities: Towards reduced photonic disorder
Homoepitaxial nonpolar (10-10) ZnO/ZnMgO monolithic microcavities: Towards reduced photonic disorder
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DOI：
10.1063/1.4954796
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发表时间：
2016-06
影响因子：
4
通讯作者：
J. Zúñiga-Pérez;L. Kappei;C. Deparis;F. Réveret;M. Grundmann;E. D. Prado;O. Jamadi;J. Leymarie;S. Chenot;M. Leroux
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文献类型：
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作者：
J. Zúñiga-Pérez;L. Kappei;C. Deparis;F. Réveret;M. Grundmann;E. D. Prado;O. Jamadi;J. Leymarie;S. Chenot;M. Leroux
采用等离子体辅助分子束外延技术在(10-10)m平面的氧化锌衬底上生长了非极性的氧化锌/氧化锌基光学微腔。反射率测量表明，随着分布布拉格反射器的层数增加，腔品质因数呈指数增长。最重要的是，用2μm量级的光斑记录的微反射率光谱显示出可以忽略的光子无序(远低于1 meV)，导致局部品质因数与宏观反射率所获得的品质因数相当。非极性异质结的各向异性既表现在平行于面内c方向拉长的表面特征上，又表现在光谱中，在不同能量下观察到两个腔模。
Nonpolar ZnO/ZnMgO-based optical microcavities have been grown on (10-10) m-plane ZnO substrates by plasma-assisted molecular beam epitaxy. Reflectivity measurements indicate an exponential increase of the cavity quality factor with the number of layers in the distributed Bragg reflectors. Most importantly, microreflectivity spectra recorded with a spot size in the order of 2 μm show a negligible photonic disorder (well below 1 meV), leading to local quality factors equivalent to those obtained by macroreflectivity. The anisotropic character of the nonpolar heterostructures manifests itself both in the surface features, elongated parallel to the in-plane c direction, and in the optical spectra, with two cavity modes being observed at different energies for orthogonal polarizations.