About the Event
Infrared science and technology are uniquely positioned to address many of today’s challenges related to health, environment, and security. This talk will describe a few concepts and materials systems for building novel mid-infrared and terahertz (far-infrared) optical components and optoelectronic devices.
I will introduce the concept of meta-interface and describe how to design such optically thin interfaces to mold an optical wavefront into arbitrary shapes. I will talk about experimental demonstrations of anomalously reflected and refracted beams that are characterized by generalized optical laws, and optical vortex beams that carry orbital angular momentum. I will discuss strategies to make reconfigurable meta-interfaces, which will open completely new applications for infrared light.
I will also talk about my work on infrared lasers and plasmonics. In particular, I will explain how I use integrated designer plasmonic structures to greatly reduce the beam divergence and improve the power output of THz quantum cascade lasers.
Nanfang Yu is a research associate in the School of Engineering and Applied Sciences at Harvard University. He received the Ph.D. degree in Engineering Sciences from Harvard University in 2009, working in Prof. Federico Capasso’s lab. He received the B.S. degree from the Department of Electronics at Peking University, Beijing, China, in 2004. His research interests include plasmonics and metamaterials, mid-infrared and terahertz optoelectronic devices, and infrared energy harvesting.
Dr. Yu has published over 30 articles in peer-reviewed scientific journals, including 16 first-author papers in journals such as Science, Physical Review Letters, Nature Materials, and Nature Photonics. His work has been featured on the cover of several scientific journals, including Science, Nature Photonics, and Applied Physics Letters. He has filed six US patents, written three book chapters, and has given more than 10 invited presentations at international conferences and seminars. He enjoys drawing with charcoal and pastel, and cooking Szechuan-style food.