报告人：Prof. Yuerui (Larry) Lu
题目：2D Materials for Optics, Excitonic and Nano-mechanical Devices
Two-dimensional (2D) materials have become very important building blocks for electronic, photonic, and phononic devices. The 2D material family has four key members, including the metallic graphene, transition metal dichalcogenide (TMD) layered semiconductors, semiconducting black phosphorous, and the insulating h-BN. Owing to the strong quantum confinements and defect-free surfaces, these atomically thin layers have offered us perfect platforms to investigate the interactions among photons, electrons and phonons. The unique interactions in these 2D materials are very important for both scientific research and application engineering.
In this talk, I would like to briefly summarize and highlight the key findings, opportunities and challenges in this field. Next, I will introduce/highlight our recent achievements. We demonstrated atomically thin micro-lens and gratings using 2D MoS2, which is the thinnest optical component around the world. These devices are based on our discovery that the elastic light-matter interactions in high-index 2D materials is very strong. Also, I would like to introduce a new two-dimensional material phosphorene. Phosphorene has strongly anisotropic optical response, which creates 1D excitons in a 2D system. The strong confinement in phosphorene also enables the ultra-high trion (charged exciton) binding energies, which have been successfully measured in our experiments. I will also introduce our recent work on atomically thin mechanical resonators, which is a fantastic platform to investigate the fundamental opto-mechanical interactions and would enable ultra-precise sensing applications. Finally, I will briefly talk about the strong light-matter interactions of 2D materials and their potential applications in energy harvesting.
Dr. Yuerui (Larry) Lu received his Ph.D. degree from Cornell University, the school of Electrical and Computer Engineering in 2012. He holds a B.S. degree in Applied Physics from University of Science and Technology of China. In 2013, he joined the Australian National University as a research fellow and lecturer under the Future Engineering Research Leadership Fellowship in Research School of Engineering. Before that, he worked as a postdoctoral research associate in SonicMEMS Laboratory at Cornell University. He was the recipient of Discovery Early Career Research Award (DECRA) from Australian Research Council (ARC) in 2014. Currently, he is leading the Nano-Electro-Mechanical System (NEMS) Lab at the ANU. His research interests include MEMS/NEMS sensors and actuators, nano-manufacturing technologies, renewable energy harvesting, biomedical novel devices, 2D materials and devices. (http://people.cecs.anu.edu.au/user/4950)