School of Science Department of Physics 68 Develop Novel Fabrication Technology Based on Direct Laser Writing Supervisor: YANG, Sen / PHYS Student: HONG, Chi Lam / PHYS LEUNG, Yik Hei / PHYS Course: UROP1000, Summer UROP1000, Summer Laser speckle is a random granular pattern formed by scattering in a medium when a highly coherent light beam irradiates a rough surface (Paschotta, 2023). It can form a unique pattern depending on the scattered surface. The aim of this project is to develop a systematical tool to detect visible concave wells on the wall with the help of the speckle pattern. However, we can only provide methods to determine the surface roughness due to the time limitation in this report. The knowledge about the formation of the speckle and its details will be discussed. The speckle pattern produced by the sandpaper with different grit sizes is also examined. Femtosecond Laser Pulse Induced Air-plasma Filament for Generating THz Radiation: Experiment and Simulation Supervisor: ZHANG, Jingdi / PHYS Student: FANG, Zhenyu / SSCI Course: UROP1000, Summer During these two months, I have explored a lot about the simulation of the propagation the electromagnetic (EM) wave, which is the Finite-Difference-Time Domain (FDTD) method by using MATLAB. During the experience of UROP, I have learnt a lot of skill and coding knowledge about FDTD. And this kind of experience have deepened my understanding of Maxwell equation. In addition, I also learned about some knowledge about phonon and phonon polariton. Through the simulation, it also give a chance to learn more about it. Femtosecond Laser Pulse Induced Air-plasma Filament for Generating THz Radiation: Experiment and Simulation Supervisor: ZHANG, Jingdi / PHYS Student: ZHANG, Shumin / PHYS Course: UROP1100, Spring UROP2100, Summer This research progress report summarizes the findings and achievements of the UROP project on simulating the process of chirping THz radiation using MATLAB. It begins with the learning part, including the theoretical knowledge about chirped laser pulses, dispersion elements, and grating as an optical component; then goes on to talk about the Finite-Difference Time-Domain (FDTD) method used in MATLAB simulation and the current progress. The report discusses the potential use of gratings to achieve pulse shaping of THz radiation and its applications in further research. Overall, this report provides a comprehensive overview of my learning and work on the UROP project.
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