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Sharp Toroidal Resonances in Planar Terahertz Metasurfaces
Author(s) -
Gupta Manoj,
Savinov Vassili,
Xu Ningning,
Cong Longqing,
Dayal Govind,
Wang Shuang,
Zhang Weili,
Zheludev Nikolay I.,
Singh Ranjan
Publication year - 2016
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201601611
Subject(s) - toroid , dipole , curl (programming language) , planar , excitation , terahertz radiation , magnetic dipole , physics , materials science , computer science , optics , quantum mechanics , computer graphics (images) , world wide web , plasma
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.