A differential filter plus shifted-beam approach produces a 3D deep-subwavelength azimuthal focal spot of volume λ³/128 with sidelobes below 20%.
Highly efficient and ultra -broadband graphene oxide ultrathin lenses with three -dimensional subwavelength focusing,
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2019 1verdicts
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Far-field three-dimensional deep-subwavelength focal spot with azimuthal polarization
A differential filter plus shifted-beam approach produces a 3D deep-subwavelength azimuthal focal spot of volume λ³/128 with sidelobes below 20%.