Terahertz characterisation of nanomaterials for device applications

半导体纳米材料已成为新型光电和自旋电子器件的有前途的候选者。为了利用这些优势特性，深入了解它们的超快载流子动力学是必不可少的。太赫兹频率范围为研究关键光电过程提供了完美的探针，因为它的能量范围包括低能量激发，如等离子体激元和声子。因此，太赫兹光谱学是一种独特的非接触工具，用于检查材料的电导率。该项目将利用光泵太赫兹探针光谱学来检测这些激发材料的光致电导率响应，直接提取关键的传输参数，如载流子迁移率和寿命。对半导体纳米线的超快载流子动力学进行研究。该项目将使用太赫兹光谱学和近场显微镜来检查其光电子特性，以应用于太赫兹器件，如单纳米线太赫兹光电探测器和太赫兹调制器。

Semiconductor nanomaterials have emerged as promising candidates for novel optoelectronic and spintronic devices. To harness these advantageous properties, an in-depth understanding of their ultrafast carrier dynamics is essential. The terahertz frequency range provides the perfect probe for investigating key optoelectronic processes, as its energy range encompasses low-energy excitations, such as plasmons and phonons. Terahertz spectroscopy is therefore a unique non-contact tool for examining the electrical conductivity of a material. This project will utilise optical-pump terahertz-probe spectroscopy to examine the photoinduced conductivity response of these exciting materials, directly extracting key transport parameters, such as carrier mobility and lifetimes. It will conduct investigation into the ultrafast carrier dynamics of semiconductor nanowires. This project will use terahertz spectroscopy and near-field microscopy to examine their optoelectronic properties for application in terahertz devices, such as single-nanowire terahertz photodetectors and terahertz modulators.