Sharp Toroidal Resonances in Planar Terahertz Metasurfaces

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• 作者：Manoj Gupta ; Vassili Savinov ; Ningning Xu ; Longqing Cong ; Govind Dayal ; Shuang Wang ; Weili Zhang ; Nikolay I. Zheludev and Ranjan Singh
• 刊名：Advanced Materials
• 出版年：2016
• 出版时间：October 5, 2016
• 年：2016
• 卷：28
• 期：37
• 页码：8206-8211
• 全文大小：1510K
• ISSN：1521-4095

文摘

A toroidal dipole in metasurfaces provides an alternate approach for the excitation of high-Q resonances. In contrast to conventional multipoles, the toroidal dipole interaction strength depends on the time derivative of the surrounding electric field. A characteristic feature of toroidal dipoles is tightly confined loops of oscillating magnetic field that curl around the fictitious arrow of the toroidal dipole vector.