讲座专家：Habib Ammari教授
单 位：苏黎世理工学院（ETH Zürich）
时 间：2022年10月28日（星期五）16:00-17:00
地点：Zoom登陆账号: 644 8002 2935密码: 1234
题目：Time-modulated metamaterials
摘要：In this lecture, the speaker will review recent results on metamaterials consisting of high-contrast subwavelength resonators whose material parameters oscillate periodically in time. His main focus is on developing a capacitance matrix characterization of the band structure, which generalizes previous recent works on static subwavelength metamaterials. This discrete characterization provides both theoretical insight and efficient numerical methods to compute the dispersion relationships of time-dependent structures. Several structures exhibiting interesting subwavelength manipulation properties will be exemplified. As will be shown in this lecture, the time-modulation causes a folding of the band structure of the material, which may induce degenerate points. By breaking time-reversal symmetry, these degeneracies may induce exceptional points, k-gaps, or open into non-symmetric, unidirectional band gaps. Topological properties of time-dependent structures will be also discussed.
专家简介：Habib Ammari is a Professor of Applied Mathematics at ETH Zürich. Before moving to ETH, he was a Director of Research at the Department of Mathematics and Applications at Ecole Normale Supérieure in Paris. He received a Bachelor's degree in 1992, a Master's degree in 1993, and a Ph.D. in applied mathematics in 1995, all from the Ecole Polytechnique, France. Following this, he received a Habilitation degree in Mathematics from the University of Pierre & Marie Curie in Paris three years later. Habib Ammari is a world leading expert in wave propagation phenomena in complex media, mathematical modelling in photonics and phononics, and mathematical biomedical imaging. He has published more than two hundred research papers, eight high profile research-oriented books and edited eight books on contemporary issues in applied mathematics. He has advised thirty four PhD students and twenty three postdoctoral researchers. Habib Ammari was awarded a European Research Council Advanced Grant in 2010 in recognition of the excellence of his achievements and his outstanding research program in mathematical imaging. He was named the 2013 winner of the Kuwait Prize in Basic Sciences and received this prestigious prize from His Highness the Emir of Kuwait. In 2015, he was the recipient of the Khwarizmi International Award in Basic Sciences, which is the highest honor accorded by His Excellency the President of the Islamic Republic of Iran for intellectual achievement. Habib Ammari has been a fellow of the Tunisian Academy of Sciences, Letters and Arts since 2015 and of the European Academy of Sciences since 2018. Since 2021, he has been also fellow of the American Mathematical Society (2022 Class) and the Academia Europaea . He is listed as an ISI highly cited researcher.
