The University of Southampton
University of Southampton Institutional Repository

Lattice-enhanced Fano resonances from bound states in the continuum metasurfaces

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.
Metamaterial, Fano resonance, Bound states in continuum, BIC, Lattice mode, Terahertz
2195-1071
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.
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, [1901572]. (doi:10.1002/adom.201901572).

Record type: Article

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
Restricted to Repository staff only until 13 January 2021.
Request a copy

More information

Accepted/In Press date: 19 November 2019
e-pub ahead of print date: 13 January 2020
Keywords: Metamaterial, Fano resonance, Bound states in continuum, BIC, Lattice mode, 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
ORCID for Eric Plum: ORCID iD orcid.org/0000-0002-1552-1840

Catalogue record

Date deposited: 27 Nov 2019 17:30
Last modified: 05 Feb 2020 01:30

Export record

Altmetrics

Contributors

Author: Thomas C.W. Tan
Author: Eric Plum ORCID iD
Author: Ranjan Singh

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×