学　术

　　主　题：Mid-infrared and Terahertz Photonics and Nanophotonics

　　时　间：2018年11月27日（周二）9:30

　　地　点：清水河校区 科研楼C218

　　主讲人：Professor Wang Qijie

　　主持人：罗文博 副教授

　　内容简介：

　　Mid-infrared (MIR) spectral region, hereafter defined as the ~3 – 20 μm wavelength range, hosts particular scientific and technological interests. Many molecules have strong and rich spectral fingerprints in this MIR region, therefore, MIR photonic and nanophotonic devices are potentially very promising for a breath of applications such as environmental and bio-chemical sensing, defense and security, industrial control, and medicine, etc. However, MIR remains a far from mature region, with a dearth in both passive and active components. The latter, including sources, modulators and photodetectors, often require materials with small enough direct bandgap, which, unfortunately, only exists in very few materials.

　　In this talk, I am going to present the working principles and our achievements of MIR and THz quantum cascade laser, which is a semiconductor based electrical pumping source. Then I am going to present our recent research in applying 2D materials for applications in the MIR regime, particularly room temperature broadband photodetectors [Nature Communication, 9:1545, 2018, Nature Communication, 9, 4299, 2018 ]. In the end, I am also going to present how we achieve ultraconfined MIR surface phonon polariton devices in dichalcogenide 2D materials [Nature Communications, 9, 1726, 2018]. I will also talk about the applications of 2D materials in the Terahertz regimes.

　　主讲人简介：

　　Professor Wang Qijie is a full professor and the Associate Chair (Research) at School of Electrical and Electronic Engineering, Nanyang Technological University Singapore. He also holds a joint appointment at School of Physical and Mathematical Sciences at the same University. His research field is in the mid-infrared and Terahertz Photonics. He has published/co-published more than 140 papers in top international journals (like Science, Nature Photonics, Nature Materials, and Nature Communications). He was the recipient of the IES (Institution of Engineers Singapore) Prestigious Engineering Achievement Team Award of Singapore Twice in 2005 and 2017, respectively, 30th World Culture Special Recognition Award 2013, the prestigious Singapore Young Scientist Award 2014, and Nanyang Research Award NTU 2015.

　　　　　　　　　　　　　　　　　　　　　电子科学与工程学院

　　　　　　　　　　　　　　　　　　　　　　2018年11月22日