基于太赫兹量子阱光电探测器的成像技术研究进展

Research progress of imaging technology based on terahertz quantum well photodetector

太赫兹(THz)波对非极性材料有较好的穿透性,对生物医学组织无电离效应,因而非常适合无损检测、生物医学成像等应用。THz量子阱光电探测器(THz QWPs)具有响应速度快、响应率高、噪声等效功率低、体积小的特点。相较于其他探测器,THz QWPs作为成像系统接收器时,系统具有成像分辨率高、成像速度快、成像信噪比高、结构紧凑等优势。本文综述了基于THz QWPs的成像研究进展,并对成像系统核心指标的影响因素进行了分析和总结。采用更稳定的装置固定THz QWPs,提升器件响应速度、探测灵敏度、阵列规模,可以有效提升系统各项核心性能。

Terahertz(THz)waves have a good transmissivity through non-polar materials,and have no ionization effects on biomedical tissues.Therefore,it is ideal for the applications such as non-destructive testing and biomedical imaging.The imaging system based on THz quantum well photodetectors(THz QWPs)has higher imaging resolution,faster imaging speed,higher signal-to-noise ratio,and more compact structure than the imaging systems based on other detectors,as the THz QWPs have fast response,high responsivity,low noise equivalent power,and tiny size.This paper reviews the research progress of the imaging technology based on THz QWPs.And the factors affecting the core indicators of the imaging system are analyzed and summarized.Using more stable fixtures to mount the THz QWPs,improving the device response speed,detection sensitivity,array size,can improve the key performance of imaging systems effectively.