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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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 |
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Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics Science::Physics Toroidal Dipole Metasurface Gupta, Manoj Singh, Ranjan Toroidal metasurfaces in a 2D flatland |
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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. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Gupta, Manoj Singh, Ranjan |
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Article |
author |
Gupta, Manoj Singh, Ranjan |
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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 |
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Toroidal metasurfaces in a 2D flatland |
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Toroidal metasurfaces in a 2D flatland |
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toroidal metasurfaces in a 2d flatland |
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2020 |
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https://hdl.handle.net/10356/138500 |
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1759852941421838336 |