报告题目：Some recent developments on thermal and dc metamaterials
报告人：Prof. Chengwei  Qiu （National University of Singapore）
报告时间：2014年12月23日（星期三）上午10点
报告地点：博习楼221
报告摘要：Manipulation of various physical fields, including optics, electromagnetics, acoustics, thermotics, etc. through different materials has been a long-standing dream for many researchers over the decades. Analogous to invisible cloak and wave-dynamic illusion, thermal metamaterials can potentially transform an actual perception into a pre-controlled perception, thus empowering unprecedented applications in thermal cloaking and camouflage. Here we report our recently two works about thermal cloak and thermal illusion based on simulation and experimental validation. We demonstrate a bilayer thermal cloak made of bulk isotropic materials. Our simulation work derived directly from thermal conduction equation, has been validated as an exact cloak, and we experimentally verified its ability to maintain the heat front and its heat protection capabilities. Also we propose and realize a functional thermal illusion device, which is capable of creating multiple expected images off the original object's position in heat conduction. The thermal scattering signature of the object is thus metamorphosed and perceived as multiple ghost targets with different geometries and compositions. Also, the thermal-metamaterial-inspired dc metadevices will be talked about, with experimental verification of bilayer dc cloak and concentrator made of unpatterned natural materials. At last, we will present dual-functional thermo-dc metamaterials which behaves as cloaking sensor for heat and current simultaneously.

个人简介：

Prof. Cheng-Wei Qiu received his B.Eng. and Ph. D. degree in 2003 and 2008, respectively. He was a Postdoctoral Fellow at Physics Department in MIT till the end of 2009. Since December 2009, he joined NUS as an Assistant Professor. He was the recipient of the SUMMA Graduate Fellowship in Advanced Electromagnetics in 2005, IEEE AP-S Graduate Research Award in 2006, URSI Young Scientist Award in 2008, NUS Young Investigator Award in 2011, MIT TR35@Singapore Award in 2012, Young Scientist Award by Singapore National Academy of Science 2013, and Faculty Young Research Award in NUS 2013. His research interests are in the areas of electromagnetic wave theory of transformation optic metamaterials, light-matter interaction, and nanophotonics. He has published over 100 journal peer-reviewed papers including Nature Photonics, Nature Communications, Physical Review Letters, Laser & Photonics Reviews, Advanced Materials, Nano Lett./ACS Nano, etc. His research has received a lot of press coverage by Science, Viewpoint Physics, PRL Synopsis, Physics World, Phys.Org, ScienceDaily, MIT Technology Review, Daily Mail (UK), Straits Times (Singapore), Le Monde, SPIE Newsroom, A&EN etc. He has given 3 keynotes in international conferences. He has been serving in editorial boards for various journals and TPCs in various conferences.