Sharp Toroidal Resonances in Planar Terahertz Metasurfaces. Issue 37 (15th July 2016)

• Record Type: Journal Article
• Authors: Gupta, Manoj; Savinov, Vassili; Xu, Ningning; Cong, Longqing; Dayal, Govind; Wang, Shuang; Zhang, Weili; Zheludev, Nikolay I.; Singh, Ranjan
• Is Part Of: Advanced materials. Volume 28:Issue 37(2016)
• Page Start: 8206
• Page End: 8211
• Publication Date: 2016-07-15
• Subjects: magnetic coupling -- metasurfaces -- terahertz -- toroidal dipoles -- high‐Q resonances; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201601611
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract : 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.