Lattice-enhanced Fano resonances from bound states in the continuum metasurfaces
Lattice-enhanced Fano resonances from bound states in the continuum metasurfaces
Fano resonances in metamaterials are known for their high quality (Q) factor and high sensitivity to external perturbations, which makes them attractive for sensors, lasers, non-linear and slow light devices. However, Fano resonances with higher Q factors obtained through structural optimization of individual resonators are accompanied by lower resonance intensity, thereby limiting the overall figure of merit (FoM) of the resonance. This article reports a strategy for simultaneously enhancing the Q factor and FoM of Fano resonances in terahertz metamaterials. Coupling of the Fano resonance, which arises from a symmetry-protected bound state in continuum, to the first order lattice mode of the metamaterial array leads to stronger field confinement and substantial enhancement of both Q factor and FoM. As such enhancement occurs in planar metamaterials independently of the resonator geometry, the proposed approach can be utilized for a wide range of high-Q and high-sensitivity terahertz metadevices.
Fano resonances, bound state in the continuum, lattice modes, metamaterials, terahertz
1-10
Tan, Thomas C.W.
9bffc8f9-a3f6-4195-9e0d-126a1f1f0f2b
Plum, Eric
50761a26-2982-40df-9153-7aecc4226eb5
Singh, Ranjan
895cd3c3-d3d4-4c1f-81f9-f7cbbd13eae8
19 March 2020
Tan, Thomas C.W.
9bffc8f9-a3f6-4195-9e0d-126a1f1f0f2b
Plum, Eric
50761a26-2982-40df-9153-7aecc4226eb5
Singh, Ranjan
895cd3c3-d3d4-4c1f-81f9-f7cbbd13eae8
Tan, Thomas C.W., Plum, Eric and Singh, Ranjan
(2020)
Lattice-enhanced Fano resonances from bound states in the continuum metasurfaces.
Advanced Optical Materials, 8 (6), , [1901572].
(doi:10.1002/adom.201901572).
Abstract
Fano resonances in metamaterials are known for their high quality (Q) factor and high sensitivity to external perturbations, which makes them attractive for sensors, lasers, non-linear and slow light devices. However, Fano resonances with higher Q factors obtained through structural optimization of individual resonators are accompanied by lower resonance intensity, thereby limiting the overall figure of merit (FoM) of the resonance. This article reports a strategy for simultaneously enhancing the Q factor and FoM of Fano resonances in terahertz metamaterials. Coupling of the Fano resonance, which arises from a symmetry-protected bound state in continuum, to the first order lattice mode of the metamaterial array leads to stronger field confinement and substantial enhancement of both Q factor and FoM. As such enhancement occurs in planar metamaterials independently of the resonator geometry, the proposed approach can be utilized for a wide range of high-Q and high-sensitivity terahertz metadevices.
Text
FanoBIC-accepted version
- Accepted Manuscript
More information
Accepted/In Press date: 19 November 2019
e-pub ahead of print date: 13 January 2020
Published date: 19 March 2020
Keywords:
Fano resonances, bound state in the continuum, lattice modes, metamaterials, terahertz
Identifiers
Local EPrints ID: 436064
URI: http://eprints.soton.ac.uk/id/eprint/436064
ISSN: 2195-1071
PURE UUID: 67c4551c-b5b3-47ad-abfb-b9e2bb69f39f
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Date deposited: 27 Nov 2019 17:30
Last modified: 17 Mar 2024 05:04
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Contributors
Author:
Thomas C.W. Tan
Author:
Ranjan Singh
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