Monday, October 26, 2015 - 4:00pm to 4:50pm
KEC 1003

Speaker Information

Xiaohang Li
Assistant Professor
Division of Computer, Electrical, Mathematical Science and Engineering
King Abdullah University of Science and Technology

Abstract

Wide-bandgap semiconductors such as III-nitrides (e.g. AlN, GaN and their compounds) have superior optical, electronic and structural properties for optoelectronics and electronics in general. In the past decades, the development of III-nitride optoelectronics including blue light-emitting diode (LED) and laser has led to revolutions in many industries as partially reflected by the Nobel Prize in Physics 2014.
Despite these progresses, there are still tremendous opportunities to explore III-nitride semiconductors for applications in the shorter wavelength range (i.e. ultraviolet, or UV). For instance, the compact and reliable UV LED is expected to dramatically innovate the entire disinfection industry. The UV laser can create numerous opportunities in data storage, non-line-of-sight communication, Raman spectroscopy, and bioagent detection.
This seminar will focus on the latest breakthroughs in III-nitride deep UV lasers. First the speaker will present the first successful attempt to grow high quality AlN layer on sapphire substrate at practical temperatures by metalorganic chemical vapor deposition (MOCVD). The AlN layer on sapphire is the template of choice for commercial devices operating in the deep UV spectrum. Then the speaker will present the works on state-of-the-art deep-UV lasers including the first laser emitting below 250 nm grown on sapphire.

Speaker Bio

Xiaohang Li is an Assistant Professor in the Division of Computer, Electrical, Mathematical Science and Engineering (CEMSE) at King Abdullah University of Science and Technology (KAUST). He received the B.S. degree with the highest honor in Applied Physics from Huazhong University of Science and Technology and M.S. degree in Electrical Engineering from Lehigh University. He received the Ph.D. degree in Electrical Engineering at Georgia Tech. Currently, Xiaohang's research is committed to innovating and perfecting growth, fabrication and characterization of III-nitride semiconductors for optoelectronic and electronic devices. Previously, Xiaohang has conducted multidisciplinary research projects related to solid state lighting, colloidal particles, ferromagnetic fluid, and water purification at various research organizations.
Xiaohang has authored over 65 journal and conference publications. He holds several issued and pending patents. He is an active reviewer for high-impact journals such as Applied Physics Letter and Optics Express. He is a recipient of D.J. Lovell Scholarship from International Society for Optics and Photonics (SPIE), Graduate Student Fellowship from IEEE Photonics Society, and Edison Prize from Georgia Tech. He served as president and treasurer of IEEE Photonics Society chapter at Lehigh University. He has been a guest blogger for Edison Innovation Foundation as well as a teacher and mentor for numerous undergraduate, graduate and K-12 students, including many underrepresented ones