In this presentation, I will introduce our research efforts in past 10 years at the University of Waterloo, mainly focusing on two projects: organic/inorganic optical upconversion devices and semiconductor quantum cascade lasers. In the optical upconversion device project, we integrated an inorganic photodetector with an organic light emitting diode. The device can convert near infrared light at 1.5 mm to visible light, enabling a new approach for achieving low-cost, large area near-infrared imaging. We had demonstrated the first up-conversion optical amplifier and the first upconversion near-infrared pixelless imaging device. In the semiconductor quantum cascade laser project, we designed a series of semiconductor quantum active regions and optimized device structures to achieve record-breaking terahertz quantum cascade lasers that can lase up to 199.5 K. I will also present some recent developments including THz QCLs based on an indirect-pumping scheme (so called phonon-photon-phonon design), a THz QCL with a dual lasing channel (see the figure below), as well as InAs/AlSb based QCLs, which demonstrate mid-infrared emission at room-temperature. If time allows, I will also briefly introduce the molecular beam epitaxy (MBE) facility and quantum-nano center nanofabrication facility at the University of Waterloo.
Dayan Ban is a Professor of Nanotechnology Engineering in the Department of Electrical and Computer Engineering of the University of Waterloo. He received a B.Sc. and M.A.Sc at the University of Science and Technology of China, Hefei, China. He received a Ph.D. in Electrical and Computer Engineering from the University of Toronto, Toronto, Ontario, Canada, in 2003. During 2001-2002, he was a visiting scientist at Nortel Networks Optical Components, Ottawa, Ontario, Canada. Dr. Ban was on staff at the Institute for Microstructural Sciences of the National Research Council, Ottawa, from Sept. 2002 to Oct. 2005. He was a visiting scientist with the Research Lab of Electronics at MIT in 2009. Dr. Ban is a senior member of IEEE/LEOS and a registered Professional Engineer in Ontario. He has over 20 year experience in designing, fabricating, characterizing optoelectronic quantum and nano devices as well as in scanning probe microscopy technique. Dr. Ban has authored or coauthored over 170 papers in refereed journals and conference proceedings and has contributed to 11 patents/patent applications.
Waterloo Institute for Nanotechnology,
University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L3G1, Canada
e-mail: dbanuwaterloo [dot] ca