Interface Engineered Photonic Devices Based
on Emerging 2D Materials
报告人: Dr. Xiaomu Wang
Post Doctoral Research Associate
时 间：2015年12月12日(星期六) 16:45
Two dimensional materials represented by graphene received a great deal of interest although they were discovered very recently. In contrast to traditional semiconductors, the unique two dimensional structures offer the necessity and possibility of studying the interface characteristics for its sensitivity to the top surface and interfaces between graphene and the substrate/contact. We are thus interested in understanding the surface and interface issues in electronic structure, carrier transport and optical properties down to nano-scale. The insightful understanding of these phenomenons provides numerous opportunities in both novel electric and optoelectronic devices.
In this talk, he will discuss graphene and related two dimensional materials' interfacial coupling to different substrates; and their mutual interactions. Performance booster of a variety of devices resulting from engineered surfaces will be demonstrated in details. At first, he will introduce the basic concept of surface engineering in two dimensional materials by demonstrating several graphene electronic devices. Subsequently, he will present how this ideal extend to photonic devices. Taking benefit from the near field coupling and favourable barrier between graphene/silicon waveguide interface, a high performance photodetector operated in mid-infrared range will be exhibited. In addition, he will also show an exciting colour tunable LED based on a semi-reduced graphene oxide at the interface between graphene oxide and its fully reduced counterpart. Finally, intriguing excitonic behaviours of an emerging post-graphene material, monolayer black phosphorus, will be investigated..
Dr. Xiaomu Wang (王肖沐) received his B.S., M.S. and Ph.D degree from Beijing Institute of Technology, Tsinghua University and The Chinese University of Hong Kong in 2006, 2009 and 2012, respectively. After working as a postdoc fellow (2012-2013) at CUHK and a research associate (2013-2014) at University of Cambridge, he is now a postdoctoral associate at Yale University. He is an awardee of Youth 1000 plan (2014) and a recipient of Young Scientist Award from Hong Kong Institute of Science (2012). His research interests lie in electronic and photonic devices and related device physics based on two-dimensional materials.