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

Here, 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 control circuitry necessary in an experimental realization can be accommodated behind the metasurface without affecting the electromagnetic response.
Authors:
ORCiD logo [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [4]
  1. FORTH, Heraklion Crete (Greece)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. FORTH, Heraklion Crete (Greece); Univ. of Crete, Crete (Greece)
  4. FORTH, Heraklion Crete (Greece); Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9789
Journal ID: ISSN 2195-1071
Grant/Contract Number:
320081; 736876; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Advanced Optical Materials
Additional Journal Information:
Journal Name: Advanced Optical Materials; Journal ID: ISSN 2195-1071
Publisher:
Wiley
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; anomalous reflection; gradient metasurfaces; Mie resonances; toroidal dipole; tunable
OSTI Identifier:
1478228
Alternate Identifier(s):
OSTI ID: 1472158

Tsilipakos, Odysseas, Tasolamprou, Anna C., Koschny, Thomas, Kafesaki, Maria, Economou, Eleftherios N., and Soukoulis, Costas M.. Pairing Toroidal and Magnetic Dipole Resonances in Elliptic Dielectric Rod Metasurfaces for Reconfigurable Wavefront Manipulation in Reflection. United States: N. p., Web. doi:10.1002/adom.201800633.
Tsilipakos, Odysseas, Tasolamprou, Anna C., Koschny, Thomas, Kafesaki, Maria, Economou, Eleftherios N., & Soukoulis, Costas M.. Pairing Toroidal and Magnetic Dipole Resonances in Elliptic Dielectric Rod Metasurfaces for Reconfigurable Wavefront Manipulation in Reflection. United States. doi:10.1002/adom.201800633.
Tsilipakos, Odysseas, Tasolamprou, Anna C., Koschny, Thomas, Kafesaki, Maria, Economou, Eleftherios N., and Soukoulis, Costas M.. 2018. "Pairing Toroidal and Magnetic Dipole Resonances in Elliptic Dielectric Rod Metasurfaces for Reconfigurable Wavefront Manipulation in Reflection". United States. doi:10.1002/adom.201800633.
@article{osti_1478228,
title = {Pairing Toroidal and Magnetic Dipole Resonances in Elliptic Dielectric Rod Metasurfaces for Reconfigurable Wavefront Manipulation in Reflection},
author = {Tsilipakos, Odysseas and Tasolamprou, Anna C. and Koschny, Thomas and Kafesaki, Maria and Economou, Eleftherios N. and Soukoulis, Costas M.},
abstractNote = {Here, 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 control circuitry necessary in an experimental realization can be accommodated behind the metasurface without affecting the electromagnetic response.},
doi = {10.1002/adom.201800633},
journal = {Advanced Optical Materials},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {9}
}

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