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Title: "Meta-atomless" architecture based on an irregular continuous fabric of coupling-tuned identical nanopillars enables highly efficient and achromatic metasurfaces
Authors: Yaǧcl, H. Bilge
Demir, Hilmi Volkan
Keywords: Science::Physics
Issue Date: 2021
Source: Yaǧcl, H. B. & Demir, H. V. (2021). "Meta-atomless" architecture based on an irregular continuous fabric of coupling-tuned identical nanopillars enables highly efficient and achromatic metasurfaces. Applied Physics Letters, 118(8), 081105-.
Journal: Applied Physics Letters
Abstract: Metasurfaces are subwavelength-thick constructs, consisting of discrete meta-atoms, providing discretized levels of phase accumulation that collectively approximate a designed optical functionality. The meta-atoms utilizing the Pancharatnam-Berry phase with polarization-converting structures produced encouraging implementations of optical components including metalenses. However, to date, a pending and fundamental problem of this approach has been the low device efficiency that such resulting metasurface components suffer, an unwanted side effect of large lattice constants that are used for preventing intercoupling of their meta-atoms. Although the use of near-field coupling for tuning electromagnetic resonances found its use in constructing efficient narrow-band designs, such structures fell short of providing high efficiency over a broad spectrum. Here, we propose and show that tightly packed fabrics of identical dielectric nanopillar waveguides with continuously tuned intercoupling distances make excellent and complete achromatic metasurface elements. This architecture enables the scatterers to interact with the incoming wave extremely efficiently. As a proof-of-concept demonstration, we showed an achromatic cylindrical metalens, constructed from strongly coupled dielectric nanopillars of a single geometry as continuously set phase elements in a meta-atomless fashion, working in the entirety of the 400-700 nm band. This metalens achieves over 85% focusing efficiency across this whole spectral range. To combat polarization sensitivity, we used hexagonally stacked nanopillars to build up a polarization-independent scatterer library. Finally, a circular metalens with polarization-independent operation and achromatic focusing was obtained. This is a paradigm shift in making an achromatic metasurface architecture by weaving identical nanopillars coupled into an irregular lattice laterally constructed via carefully tuned near-field coupling.
ISSN: 0003-6951
DOI: 10.1063/5.0040365
Rights: © 2021 The Author(s) (Published by AIP). All rights reserved. This paper was published in Applied Physics Letters and is made available with permission of The Author(s) (Published by AIP).
Fulltext Permission: open
Fulltext Availability: With Fulltext
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