题目：光子晶体作为探索物理新前沿的平台

报告人：陈子亭(Che Ting Chan)

邀请人：王立刚

时间：2024年11月15日（周五）下午15:30

地点：紫金港校区海纳苑8幢215报告厅

摘要：

光子晶体是具有周期性折射率调制的材料，它们能以前所未有的方式控制光的流动，因而具有广泛的应用。在本次报告中，我将重点讨论用光子晶体来探索物理学的前沿。我将通过几个涉及拓扑物理的例子来说明。我们引入“光子合金”这一概念，为一种非周期性光子晶体。我们展示了在二维光子晶体中，即使在没有周期性结构的情况下，也可以靠结合非磁化成分和磁化成分来得到非平凡的拓扑边界态。这些边界态可以用反射相位的卷绕数来刻画。特别是，靠打破局部时间反演对称性，我们观察到了非互易的手性边界态。此外，我们将介绍带旋磁的双零超材料，这种光子晶体在长波极限下，其介电常数为零，磁导率是一个行列式为零的张量。这种旋磁双零超材料适合产生一种被称为时空涡旋脉冲的复杂光脉冲，而这种脉冲与体态能带中的狄拉克点有关。我们的主要发现是，旋磁双零超材料的稳定性来源于拓扑转变点处的一个独特关系，它揭示了零折射率光子学、拓扑光子学和奇点光学之间的联系。

个人简介：

Prof. Che Ting Chan serves as the Associate Vice-President (Research & Development) of the Hong Kong University of Science and Technology (HKUST), the Daniel C K Yu Professor of Science, Chair Professor in the Department of Physics, and the Director of the Research Office of HKUST. He is also a Member of the Hong Kong Academy of Sciences and Fellow of the American Physical Society. Prof. Chan received his BSc degree from the University of Hong Kong in 1980 and his Ph.D. degree from the University of California at Berkeley in 1985. Then he was employed at Ames Laboratory-USDOE and joined HKUST in 1995. He was elected as a Fellow of the American Physical Society in 1996 and a Member of the Hong Kong Academy of Sciences in 2021. He was awarded significant international honors including the Brillouin Medal and the Achievement in Asia Award. Prof. Chan has published over 150 papers in prestigious international journals including Nature, Science, Nature Photonics, Light: Science & Applications, etc. with a total of more than 60,000 citations. His primary areas of interest include surface physics, nanomaterials, metamaterials, and light manipulation. He is now the Associate EIC of ACS Photonics and has previously served on the editorial boards of Applied Physics, Physical Review B, etc.