Enhanced light emission from improved homogeneity in biaxially suspended Germanium membranes from curvature optimization
Enhanced light emission from improved homogeneity in biaxially suspended Germanium membranes from curvature optimization
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DOI：
10.1364/oe.25.022911
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发表时间：
2017-09-18
期刊：
影响因子：
3.8
通讯作者：
Kelsall, Robert
中科院分区：
文献类型：
--
作者：
Burt, Daniel;Al-Attili, Abdelrahman;Kelsall, Robert
硅兼容光源对于开发完全单片的硅光子学平台至关重要。悬浮锗膜中的应变工程为这样的光源提供了潜在的途径。然而，双轴结构由于不利的应变分布而遭受不良的光学性质。使用一种新的几何方法和有限元建模（FEM）的结构与改进的应变均匀性的设计和制造。显微拉曼（μ-拉曼）光谱用于确定中心应变值。显微光致发光（μ-PL）被用来研究光发射上的应变分布的影响，我们报告的PL增强高达3倍，通过优化曲率在应变值为0.5%的双轴应变。这种几何方法为增强锗中的光发射提供了机会，以开发实用的芯片上光源。(C)2017美国光学学会
A silicon compatible light source is crucial to develop a fully monolithic silicon photonics platform. Strain engineering in suspended Germanium membranes has offered a potential route for such a light source. However, biaxial structures have suffered from poor optical properties due to unfavorable strain distributions. Using a novel geometric approach and finite element modelling (FEM) structures with improved strain homogeneity were designed and fabricated. Micro-Raman (mu-Raman) spectroscopy was used to determine central strain values. Micro-photoluminescence (mu-PL) was used to study the effects of the strain profiles on light emission; we report a PL enhancement of up to 3x by optimizing curvature at a strain value of 0.5% biaxial strain. This geometric approach offers opportunity for enhancing the light emission in Germanium towards developing a practical on chip light source. (C) 2017 Optical Society of America