报告题目:介质超表面连续介质中的束缚态:面向实用器件
报告人:图兹·弗拉基米尔
报告时间:2021年10月12日上午10点
报告地点:线上,腾讯会议(会议号:365 695 121)
报告人简介:
Vladimir Tuz(弗拉基米尔·图兹),伟德BETVlCTOR1946教授,1996年于乌克兰哈尔科夫国立大学获得硕士学位,2005年获得副博士学位,2013年获得博士学位,在2009-2016年间担任乌克兰国家科学院射电天文研究所理论放射物理学系的高级研究员,从2016至今担任伟德BETVlCTOR1946未来科学国际合作联合实验室/电子科学与工程学院教授,带领团队从事以下方面的研究:电磁超构材料和光子晶体学(应用于天文、航空航天、医疗、材料等方向);电磁计算的数值模拟方法(数学建模,开发解析算法和数值算法);微波测量(在一定频率范围内对新型人工材料和天线的电磁特性进行精确测量)。
报告简介:
In the present report, we introduce an approach that allows the effective control of specific resonant states, which originate from the bound states in the continuum (BICs) of optical metasurfaces, by utilizing the symmetry breaking in the unit cell of dielectric metasurfaces. We demonstrate that our idea is quite general, and has been validated in metasurfaces composed of lattices of particle clusters corresponding to different symmetries. By introducing this unique degree of freedom, one can efficiently control the symmetry of the discrete mode and thus manipulate its interaction with the continuum. Employing this approach, we realize access to various kinds of multipolar BIC-associated leaky modes existing in the cluster-based dielectric metasurfaces. We further discuss proof-of principle microwave experiments performed to demonstrate leaky resonances associated with the BICs in both far-field and near-field measurements. Finally, we outline the tasks for practical utilization of the proposed approach.
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