Device and Material Characterisation of Vertical Cavity Surface Emitting Lasers

垂直腔面发射激光器（VCSELs）由于其低能耗、优异的光束质量和大批量生产的潜力而被大量应用所需要。针对不同应用所需的不同特性，外延层的设计和制造方法有本质上的不同。这导致了生产规模的不同需求。学生将获得整个VCSEL制造过程的概述，从特定应用的合适结构的设计，化合物半导体层的生长，器件和器件阵列的制造，质量保证的晶圆上测试和单个特性的测量，以及对基础物理的理解。学生将解决与制造两种代表性VCSELS相关的科学挑战；第一个主要要求电能到光能的有效转换，第二个集中在具有非常高的光束质量和窄激光线宽的vcsel。学生还将研究在不同衬底（如硅甚至非晶材料）上生长和制造的机会。工业案例奖与IQE plc合作。（4年资助的博士）导师Peter Smowton教授和Iwan Davies博士（IQE）博士将在IQE和卡迪夫大学进行

Vertical Cavity Surface Emitting Lasers (VCSELs) are required for a large number of applications due to low energy usage, superior beam quality and the potential for very large volume manufacturing. The epitaxial layer design and the fabrication methodology are substantially different for the different characteristics required by different applications. This leads to different requirements in the scaling up of manufacturing. The student will gain an overview of the entire VCSEL manufacturing process from the design of suitable structures for particular applications, the growth of the Compound Semiconductor layers, the fabrication of devices and arrays of devices, the on-wafer testing for quality assurance and the measurement of individual characteristics together with an understanding of the underlying physics. The student will address the scientific challenges associated with manufacturing two representative types of VCSELS; the first primarily requiring the efficient conversion of electrical to optical energy and the second focussed on VCSELs with very high beam quality and narrow laser linewidth. The student will also investigate the opportunities for growth and fabrication on different substrates such as Silicon and even amorphous materials. Industrial CASE award in partnership with IQE plc. (4 year funded PhD)Supervisors Prof Peter Smowton and Dr Iwan Davies (IQE)The PhD will be carried out across the IQE and Cardiff University sites