Journal
NANOMATERIALS
Volume 12, Issue 13, Pages -Publisher
MDPI
DOI: 10.3390/nano12132252
Keywords
all-dielectric metasurfaces; bound states in the continuum; resonances; coupled-dipole theories; polarization conversion
Categories
Funding
- European Union [CONVREC-2021-23]
- University of Valladolid
- Spanish Ministerio de Ciencia e Innovacion (MICIU/AEI/FEDER, UE) [PGC2018-095777-B-C21]
- Swiss National Science Foundation [197146]
- Erasmus+ programme of the European Union
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This study explores the possibility of achieving polarization conversion using all-dielectric metasurfaces, where linearly polarized light can be transformed into circularly polarized light with near unity polarization rates by precisely adjusting parameters while maintaining the high Q values of quasi-BICs. Moreover, by using double accidental BICs, right and left circularly polarized light can be obtained on demand just by varying the angle of incidence.
Quasi-bound states in the continuum (quasi-BICs) supported in all-dielectric metasurfaces (MTS) are known for their confinement in real space and the notably high values of the quality factor Q. Recently, the properties of quasi-BICs have been employed to achieve polarization conversion with all-dielectric MTS. However, one of the main disadvantages of the current approaches is the dependence on the chirality of either the meta-atoms or their disposition. We present the possibility of achieving polarization conversion by using all-dielectric MTS with square and rectangular lattices of nano-disks. The precise tuning of the lattice and disks parameters allows to transform linearly polarized light into circularly polarized light with near unity polarization rates while maintaining the high Q values of quasi-BICs. Moreover, by using double accidental BICs it is possible to obtain right and left circularly polarized light on demand just by varying the angle of incidence.
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