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A tunable electromagnetic metagrating
Publication available at: | https://research-information.bris.ac.uk/ws/portalfiles/portal/350479989/Metacylinder_EM_RSPA_submission_Edited.pdf |
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Title: | A tunable electromagnetic metagrating |
Authors: | Putley, HJ Guenneau, S Porter, R Craster, RV |
Item Type: | Journal Article |
Abstract: | We explore electromagnetic (EM) wave incidence upon gratings of reconfigurable metamaterial cylinders, which collectively act as a metagrating, to identify their potential as reconfigurable subwavelength surfaces. The metacylinders are created by a closely spaced, microstructured array of thin plates that, in the limit of small inter-plate spacing, are described by a semi-analytical continuum model. We build upon metacylinder analysis in water waves, translating this to EM for TE polarization (longitudinal magnetic field) for which the metacylinders exhibit anisotropic scattering; this is exploited for the multiple scattering of light by an infinite metagrating of uniform cylinder radius and angle, for which we retrieve the far-field reflection and transmission spectra for plane-wave incidence. These spectra reveal unusual effects including perfect reflection and a negative Goos–Hänchen shift in the transmitted field, as well as perfect symmetry in the far-field scattering coefficients. The metagrating also hosts Rayleigh–Bloch surface waves, whose dispersion is contingent on the uniform cylinder angle, shifting under rotation towards the light-line as the cylinder angle approaches the horizontal. For both plane-wave scattering and the calculation of the array-guided modes, the cylinder angle is the principal variable in determining the wave interaction, and the metagrating is tunable simply through rotation of the constituent metacylinders. |
Issue Date: | Dec-2022 |
Date of Acceptance: | 17-Nov-2022 |
URI: | http://hdl.handle.net/10044/1/105960 |
DOI: | 10.1098/rspa.2022.0454 |
ISSN: | 1364-5021 |
Publisher: | The Royal Society |
Start Page: | 1 |
End Page: | 22 |
Journal / Book Title: | Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences |
Volume: | 478 |
Issue: | 2268 |
Copyright Statement: | © 2022 The Author(s) Published by the Royal Society. All rights reserved. |
Publication Status: | Published |
Open Access location: | https://research-information.bris.ac.uk/ws/portalfiles/portal/350479989/Metacylinder_EM_RSPA_submission_Edited.pdf |
Online Publication Date: | 2022-12-14 |
Appears in Collections: | Condensed Matter Theory Physics Faculty of Natural Sciences |