光学相干层析成像技术（OCT）以其高分辨率、非接触、无辐射损伤等优点被广泛地应用于临床眼科诊断、癌症诊断、心血管成像、皮肤诊断等多个领域。宽谱光源是OCT系统的一个最核心的部分，光源的谱宽和功率决定着OCT成像的空间分辨率、成像速度和深度等。超高分辨率（< 2微米）的OCT系统会得到亚细胞尺寸的、高分辨率的人体细胞组织成像，对医疗应用中迅速和准确地诊断和预防疾病有着决定性的作用。本项目申请旨在利用宽光谱自组织量子点材料作为增益介质，采用多层、每层量子点结构各异的量子点结构和量子点与量子阱混合的外延材料结构，并结合过生长选择区域退火工艺及多接触电极等多种的器件结构来实现0.9微米至1.4微米波段的，室温3dB半宽不小于250纳米的宽光谱发光光源。项目将对包括宽光谱量子点材料的分子束外延生长、材料结构和光学性质、宽光谱光源制备、宽谱光源在OCT系统的应用等在内的所有环节进行研究。

Optical coherence tomography (OCT) is a recently developed, noninvasive technology that provides three–dimensional images of biological subsurface tissue structure, which has been widely applied to many medical specialties, ranging from ophthalmology to gastroenterology. As the axial resolution and the penetration depth of the OCT images are determined by the bandwidth and power of the light source, so broadband light source is the most crucial element for such system. The development of broadband light sources for obtaining ultrahigh resolution OCT will significantly improve the clinical utility of OCT imaging, and hence bringing significant improvement in quality of life to many people worldwide. In this project, the research will focus on the MBE epitaxy growth, selective area post-growth intermixing process and multi-section device fabrication process of quantum dot based broadband light sources, and the application of the obtained broadband light sources in ultra-high resolution OCT system.