Department of Electrical and Photonics Engineering, Technical University of Denmark, 2800 Kongens Lyngby, Denmark.
GLAZE Technologies Aps, 2950 Vedbæk, Denmark.
Sensors (Basel). 2023 Mar 21;23(6):3297. doi: 10.3390/s23063297.
We demonstrate the use of a novel, integrated THz system to obtain time-domain signals for spectroscopy in the 0.1-1.4 THz range. The system employs THz generation in a photomixing antenna excited by a broadband amplified spontaneous emission (ASE) light source and THz detection with a photoconductive antenna by coherent cross-correlation sampling. We benchmark the performance of our system against a state-of-the-art femtosecond-based THz time-domain spectroscopy system in terms of mapping and imaging of the sheet conductivity of large-area graphene grown by chemical vapor deposition (CVD) and transferred to a PET polymer substrate. We propose to integrate the algorithm for the extraction of the sheet conductivity with the data acquisition, thereby enabling true in-line monitoring capability of the system for integration in graphene production facilities.
我们展示了一种新颖的集成太赫兹系统的应用，该系统可用于在 0.1-1.4 太赫兹范围内获得光谱时域信号。该系统采用在宽带放大自发辐射（ASE）光源激发下的光电混合天线产生太赫兹波，并通过相干互相关采样的光电导天线进行太赫兹探测。我们将我们的系统与基于飞秒的太赫兹时域光谱系统的性能进行了基准测试，比较了它们在大面积化学气相沉积（CVD）生长并转移到 PET 聚合物衬底上的石墨烯的面电导率的测绘和成像方面的性能。我们提出将面电导率提取算法与数据采集集成在一起，从而为系统提供真正的在线监测能力，以便集成到石墨烯生产设备中。
