Space-Time Metasurfaces

Speaker:   Xuchen Wang (王旭辰), Karlsruhe Institute of Technology (德国卡尔斯鲁厄理工大学)

Time:        17:00-18:00, July 20th

Location: Tencent Meeting,  腾讯会议号：163372367

Host:        Fenghan Lin

Abstract:

Traditional metasurfaces have uniform and homogeneous electromagnetic properties in both space and time, which significantly hampers their ability to achieve various functionalities. One crucial challenge is that traditional metasurfaces can only control waves from one specific direction, making them uncontrollable for incidents from other directions. Additionally, these metasurfaces must adhere to fundamental laws like reciprocity and energy conservation, further restricting their performance and functionalities. To tackle these limitations, our research delves into understanding the underlying physical reasons behind the performance constraints of homogeneous metasurfaces. By introducing spatial and/or temporal modulation and exploring additional engineering dimensions, we overcome these fundamental limitations. This innovative approach vastly enriches the functionalities of metasurfaces and enhances their efficiencies, heralding a promising advancement in metasurface technology.

传统超表面的电磁属性在空间域与时间域中均匀分布，其对波束的调控能力具有极大的局限性。例如，传统超表面只能控制来自一个特定方向的电磁波，而对其他方向的入射波束无法控制。此外，传统电磁表面必须遵循基本电磁规律，如互易性和能量守恒，进一步限制了它们的性能和功能。我们通过对超表面电磁属性在空间域与时间域中进行调制，充分利用时空维度，克服这些根本性能及功能限制。这种创新方法极大丰富了超表面的功能，并提高了它们的效率，为未来6G智能表面技术打下了理论基础。

Bio:

Dr. Wang Xuchen completed his undergraduate studies in the Department of Physics at Northwestern Polytechnical University. He obtained his master's degree from Zhejiang University. After completing his master's, he worked as an RF antenna engineer at Huawei Technologies and TP-Link. He received his doctoral degree from the Department of Electronics and Nanoengineering at Aalto University in Finland. Currently, he is working as a postdoctoral researcher at the Karlsruhe Institute of Technology in Germany.

His main research focuses on spatiotemporal electromagnetic metasurfaces and four-dimensional electromagnetic materials to surpass the theoretical limits of traditional electromagnetic materials. As the first author, he has published over ten papers in top international journals, including Science Advances, Physical Review Letters, IEEE Transactions on Antennas and Propagation, IEEE Transactions on Microwave Theory and Technology, Nanophotonics, ACS Photonics, among others. His research findings have been featured in more than 30 international scientific media outlets. His multichannel metasurface technology has been defined as the Enabling technology for large-scale 6G wireless communication projects under the European Union's Horizon 2020 program.

His doctoral thesis was praised by Professor Juan Sebastian Gomez-Diaz from the University of California, Davis, as fundamentally surpassing existing technologies and was awarded an outstanding doctoral thesis by Aalto University. He has received the Young Scientist Award from the International Radio Science Union, the Jorma Ollila Award in the field of communications, the National Scholarship for Self-Financed International Students, and won the first place in the student paper competition at the PIERS conference.

王旭辰博士本科毕业于西北工业大学物理系，硕士毕业于浙江大学光电系，硕士毕业后曾在华为技术有限公司与普联技术有限公司担任射频天线工程师。博士毕业于芬兰阿尔托大学电子与纳米工程学系。目前在德国卡尔斯鲁厄理工大学做博士后研究工作。他的主要研究方向是时空电磁超表面与四维电磁材料，用以突破传统电磁材料的理论极限。他以第一作者身份在国际顶级期刊上发表论文十余篇，包括Science Advances, Physical review Letter, IEEE Transactions on Antennas and Propagation, IEEE Transactions on Microwave Theory and Technology, Nanophotonics, ACS photonics等，他的研究成果先后被30多家国际科技媒体报道。他的多通道超表面的技术被欧盟地平线2020计划旗下的大型6G无线通讯项目定义为“驱动性技术”。博士论文被美国加州大学戴维斯分校Juan Sebastian Gomez-Diaz教授评价为“从根本上超越现有技术”，并被阿尔托大学评为优秀博士论文。曾获得国际无线电联盟颁发的青年科学家奖，通讯领域的Jorma Ollila 奖，国家自费留学生奖，以及国际电磁与光子会议学生论文竞赛第一名等。