Pairing Toroidal and Magnetic Dipole Resonances in Elliptic Dielectric Rod Metasurfaces for Reconfigurable Wavefront Manipulation in Reflection

Advanced Optical Materials
Odysseas TsilipakosCostas M Soukoulis

Abstract

A novel approach for reconfigurable wavefront manipulation with gradient metasurfaces based on permittivity-modulated elliptic dielectric rods is proposed. It is shown that the required 2π phase span in the local electromagnetic response of the metasurface can be achieved by pairing the lowest magnetic dipole Mie resonance with a toroidal dipole Mie resonance, instead of using the lowest two Mie resonances corresponding to fundamental electric and magnetic dipole resonances as customarily exercised. This approach allows for the precise matching of both the resonance frequencies and quality factors. Moreover, the accurate matching is preserved if the rod permittivity is varied, allowing for constructing reconfigurable gradient metasurfaces by locally modulating the permittivity in each rod. Highly efficient tunable beam steering and beam focusing with ultrashort focal lengths are numerically demonstrated, highlighting the advantage of the low-profile metasurfaces over bulky conventional lenses. Notably, despite using a matched pair of Mie resonances, the presence of an electric polarizability background allows to perform the wavefront shaping operations in reflection, rather than transmission. This has the advantage that any con...Continue Reading

References

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Mar 30, 2018·ACS Photonics·Odysseas TsilipakosCostas M Soukoulis
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Citations

Dec 29, 2018·Nanomaterials·José Francisco AlgorriJosé Manuel Sánchez-Pena
Mar 17, 2019·Optics Express·J F AlgorriJ M Sánchez-Pena
May 19, 2019·Scientific Reports·Dimitrios C ZografopoulosRomeo Beccherelli
Sep 13, 2019·Optics Express·Jade Martínez-LlinàsPhilippe Tassin
Jun 6, 2019·Optics Express·Thomas ChristopoulosEmmanouil E Kriezis
Oct 21, 2020·Scientific Reports·Odysseas TsilipakosMaria Kafesaki
May 1, 2021·Sensors·Hamidreza TaghvaeeAlbert Cabellos-Aparicio
Oct 7, 2019··Hamidreza TaghvaeeMarios Lestas

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Software Mentioned

COMSOL Multiphysics

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