Rotationally tunable polarization-insensitive metasurfaces for generating vortex beams

Balli, Fatih; Sultan, Mansoor A.; Hastings, J. T.

doi:10.1117/12.2567798

Cited by 9 publications

(3 citation statements)

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“…Metalenses, lenses composed of quasi-periodic subwavelength structures, have received a great deal of attention due to their compact size, light weight, efficient wavefront shaping, and polarization conversion properties [1][2][3][4][5][6]. On the other hand, correction of chromatic and off-axis aberrations remains challenging [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

An ultrabroadband 3D achromatic metalens

et al. 2021

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We design and fabricate ultra-broadband achromatic metalenses operating from the visible into the short-wave infrared, 450–1700 nm, with diffraction-limited performance. A hybrid 3D architecture, which combines nanoholes with a phase plate, allows realization in low refractive index materials. As a result, two-photon lithography can be used for prototyping while molding can be used for mass production. Experimentally, a 0.27 numerical aperture (NA) metalens exhibits 60% average focusing efficiency and 6% maximum focal length error over the entire bandwidth. In addition, a 200 μm diameter, 0.04 NA metalens was used to demonstrate achromatic imaging over the same broad spectral range. These results show that 3D metalens architectures yield excellent performance even using low-refractive index materials, and that two-photon lithography can produce metalenses operating at visible wavelengths.

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Section: Introductionmentioning

confidence: 99%

An ultrabroadband 3D achromatic metalens

et al. 2021

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“…When the two metasurfaces rotate relatively to each other, optical vortices of topological charges −2 and −1 can be generated and separated at the same time, but the rotation angle cannot be continuously tuned to generate other topological charges. In 2020, Balli et al arranged TiO 2 nanopillars on a fused silica substrate to form a metasurface, and cascaded two metasurfaces to form a moiré structure [31]. By changing the relative rotation angle of the two layers, the device can generate topological charges from 0 to 3.…”

Section: Introductionmentioning

confidence: 99%

A multi-channeled vortex beam switch with moiré metasurfaces

Cui¹,

Liu²,

Hu³

et al. 2021

J. Opt.

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Tunable metasurface devices are considered to be an important link for metasurfaces to practical applications due to their functional diversity and high adaptability to the application scenarios. Metasurfaces have unique value in the generation of vortex beams because they can realize light wavefronts of any shape. In recent years, several vortex beam generators using metasurfaces have been proposed. However, the topological charge generally lacks tunability, which reduces the scope of their applications. Here, we propose an active tunable multi-channeled vortex beam switch based on a moiré structure composed of two cascaded dielectric metasurfaces. The simulation results show that when linearly polarized light with a wavelength of 810 nm is incident, the topological charge from -6 to +6 can be continuously generated by relatively rotating the two metasurfaces. Meanwhile, different topological charges are deflected to different spatial channels, realizing the function of multi-channeled signal transmission. We also study the efficiency and broadband performance of the structure. The proposed multi-channeled separation method of vortex beams that can actively tune topological charges paves the way for the compactness and functional diversity of devices in the fields of optical communications, biomedicine, and optoelectronics.

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“…Instead, metasurfaces introduce subwavelength nanostructures that allow controllable phase shifting of the propagating light. Metasurfaces can offer precise control over light intensity, phase, and polarization; thus, they have been widely utilized in the design and fabrication of optical metafilters 8,9 , metalenses [10][11][12][13][14] ,and in vortex beam generation [15][16][17] .…”

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Hybrid Metasurfaces for Simultaneous Focusing and Filtering

Sultan¹,

Balli²,

Lau³

et al. 2020

Preprint

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This work presents the design and fabrication of simple, polymeric, structure-based optical filters that simultaneously focus light. These filters represent a novel design at the boundary between diffractive optics and metasurfaces that may provide significant advantages for both digital and hyperspectral imaging. The fabrication process for the proposed filters resembles 3D printing, and is based on direct laser writing of a polymeric material using two-photon lithography. In addition, printed structures could be used to create molds for nanoimprint replication and mass production. Filters for visible and near-infrared wavelengths were designed using finite difference time domain (FDTD) simulations.

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Rotationally tunable polarization-insensitive metasurfaces for generating vortex beams

Cited by 9 publications

References 0 publications

An ultrabroadband 3D achromatic metalens

An ultrabroadband 3D achromatic metalens

A multi-channeled vortex beam switch with moiré metasurfaces

Hybrid Metasurfaces for Simultaneous Focusing and Filtering

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