Toroidal metasurfaces in a 2D flatland

A toroidal dipole is a new class of electromagnetic excitations and are different from traditional electric and magnetic dipoles. Toroidal dipoles are described by the poloidal currents flowing on the surface of torus and have opened a new route to control radiative losses via near field coupling me...

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Main Authors: Gupta, Manoj, Singh, Ranjan
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/138500
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1385002023-02-28T19:25:27Z Toroidal metasurfaces in a 2D flatland Gupta, Manoj Singh, Ranjan School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies The Photonics Institute Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics Science::Physics Toroidal Dipole Metasurface A toroidal dipole is a new class of electromagnetic excitations and are different from traditional electric and magnetic dipoles. Toroidal dipoles are described by the poloidal currents flowing on the surface of torus and have opened a new route to control radiative losses via near field coupling mechanism or radiation cancellation approach in the unit cell of metasurface. Radiative loss engineering in metamaterials is one of the most fundamental requirements to gauge the suitability of a metaphotonic device for a specific on-demand application. Here, we discuss strategies to excite toroidal dipolar modes in a planar metasurface which were initially thought to exist only in three-dimensional (3D) arrangements. Two dimensional (2D) toroidal metasurfaces are conceptual simplification of 3D toroid configurations, which pose fabrication challenges at micro-nanoscales. We further discuss the destructive interference between electric and toroidal dipoles to realize non-radiating modes in the form of an anapole excitation that fulfills the requirement for the excitation of extremely large quality factor resonances. Overall, the intriguing features of a toroidal dipole could have significant implications on the design of resonant metamaterials that are important for the development of low-loss sensors, modulators, filters, and efficient cavities for strong light matter interactions. MOE (Min. of Education, S’pore) Published version 2020-05-07T06:48:03Z 2020-05-07T06:48:03Z 2020 Journal Article Gupta, M., & Singh, R. (2020). Toroidal metasurfaces in a 2D flatland. Reviews in Physics, 5, 100040-. doi:10.1016/j.revip.2020.100040 2405-4283 https://hdl.handle.net/10356/138500 10.1016/j.revip.2020.100040 5 en Reviews in Physics © 2020 The Author(s) Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Science::Physics
Toroidal Dipole
Metasurface
spellingShingle Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Science::Physics
Toroidal Dipole
Metasurface
Gupta, Manoj
Singh, Ranjan
Toroidal metasurfaces in a 2D flatland
description A toroidal dipole is a new class of electromagnetic excitations and are different from traditional electric and magnetic dipoles. Toroidal dipoles are described by the poloidal currents flowing on the surface of torus and have opened a new route to control radiative losses via near field coupling mechanism or radiation cancellation approach in the unit cell of metasurface. Radiative loss engineering in metamaterials is one of the most fundamental requirements to gauge the suitability of a metaphotonic device for a specific on-demand application. Here, we discuss strategies to excite toroidal dipolar modes in a planar metasurface which were initially thought to exist only in three-dimensional (3D) arrangements. Two dimensional (2D) toroidal metasurfaces are conceptual simplification of 3D toroid configurations, which pose fabrication challenges at micro-nanoscales. We further discuss the destructive interference between electric and toroidal dipoles to realize non-radiating modes in the form of an anapole excitation that fulfills the requirement for the excitation of extremely large quality factor resonances. Overall, the intriguing features of a toroidal dipole could have significant implications on the design of resonant metamaterials that are important for the development of low-loss sensors, modulators, filters, and efficient cavities for strong light matter interactions.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Gupta, Manoj
Singh, Ranjan
format Article
author Gupta, Manoj
Singh, Ranjan
author_sort Gupta, Manoj
title Toroidal metasurfaces in a 2D flatland
title_short Toroidal metasurfaces in a 2D flatland
title_full Toroidal metasurfaces in a 2D flatland
title_fullStr Toroidal metasurfaces in a 2D flatland
title_full_unstemmed Toroidal metasurfaces in a 2D flatland
title_sort toroidal metasurfaces in a 2d flatland
publishDate 2020
url https://hdl.handle.net/10356/138500
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