Spiniform phase-encoded metagratings entangling arbitrary rational-order orbital angular momentum

Huang, Kun; Liu, Hong; Restuccia, Sara; Mehmood, Muhammad Qasim; Mei, Sen; Giovannini, Daniel; Danner, Aaron J.; Padgett, Miles J.; Teng, Jinghua; Qiu, Cheng‐Wei

doi:10.1038/lsa.2017.156

Cited by 106 publications

(55 citation statements)

References 66 publications

(46 reference statements)

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“…Besides these single-function metasurface devices such as metalenses [19][20][21][22], wave plates [23][24][25] and optical vortex generators [26][27][28][29], multifunctional metasurfaces have been also proposed [30][31][32]. Zhao H et al presented a multiplexed vortex generator consisting of C-shaped slot array and realized orbital angular momentum multiplexing and demultiplexing in the terahertz band, but the polarization conversion efficiency is low [33].…”

Section: Introductionmentioning

confidence: 99%

Spatial multiplexing plasmonic metalenses based on nanometer cross holes

et al. 2018

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Metasurfaces enable a spatially varying optical response to mold optical wavefronts into shapes that can be designed at will. Recurring to the excellent metasurfaces, spatial multiplexing metalens with multiple focal spots distributing along the transverse or longitudinal direction and vortex metalens with controllable topological charge are performed. These metalenses are composed of identical cross holes etched on the silver film and each cross hole can be taken as an equivalent half wave plate. The proposed spatial multiplexing metalenses can focus the light beam and spin the wave front, and their advantages of multifunction, high signal-to-noise ratio and ease to manipulate are favorable for expanding the application of plasmonic metalenses in optical manipulation.

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Section: Introductionmentioning

confidence: 99%

Spatial multiplexing plasmonic metalenses based on nanometer cross holes

et al. 2018

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“…According to our experiments, OAM beams with | l| < 10 can be well discriminated. Additionally, we would like to explain that this method is not valid for the OAM beams with fractional topological charge, since they are not stable beams where the variable discontinuity in phase will dramatically influence the coupled SPP beam profiles and destroy the measurement.…”

Section: Complete Measurement Of Topological Chargementioning

confidence: 99%

On‐Chip Detection of Orbital Angular Momentum Beam by Plasmonic Nanogratings

Chen

et al. 2018

Laser & Photonics Reviews

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Thanks to the unlimited orthogonal states, the orbital angular momentum (OAM) light is widely accepted as a promising carrier for high information multiplexing in optical communications, in which the OAM detection is an important issue. To keep up with the ever‐growing demand for compact integration, here, a plasmonic grating is employed to spatially couple the OAM modes into two separated propagating surface plasmon polariton (SPP) beams with different splitting angles. These splitting angles are found to strongly rely on the topological charges of the incident beams and are insensitive to the specific location of the OAM beam illumination, which provides an intuitive detection of the OAM modes without particular alignment. Besides, a further unidirectional SPP launching from the OAM beam is also achieved by a particular composite grating. With such composite grating, both the topological charge value and sign of OAM beam in a single measurement can be detected. Our results provide a convenient method for alignment‐free OAM detection by a compact device, and would inspire more multiplexing applications in nanophotonics.

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“…With the rapid development of nanophotonics and nanofabrication technology, micro/nanostructured optical devices with different functionalities have attracted intense attention in recent years due to their advantages of small size, light weight, integratability, and superb performances . Imaging elements and polarization manipulation elements have been the two of the most widely investigated device types because of the essential and indispensable functions of these elements .…”

Section: Introductionmentioning

confidence: 99%

Chiral Metalens of Circular Polarization Dichroism with Helical Surface Arrays in Mid‐Infrared Region

Sun

Guo

et al. 2019

Advanced Optical Materials

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polarization manipulation elements have been the two of the most widely investigated device types because of the essential and indispensable functions of these elements. [5][6][7][8][9] In contrast with the traditional bulky optical lenses, a metalens is a micro/ nanostructured metasurface lens in which the amplitude, phase, and polarization state of the transmitted or reflected electromagnetic waves can be manipulated by the micro/nanostructures at the subwavelength scale based on the effects of surface plasmonic polaritons (SPP) or localized surface plasmonics (LSP), [10][11][12][13][14] Mie resonances, [15] and geometric phase (also known as Pancharatnam-Berry phase, P-B phase), [9,[16][17][18][19][20][21][22][23][24] using which focusing, imaging and/or wavefront manipulation in the transmission or reflection can be achieved. Plasmonic lenses consist of an array of metal plasmonic antennas in which a phase discontinuity related to the geometry and dimension of the metallic antennas appears between the incident electromagnetic wave and the transmitted and/or reflected electromagnetic wave due to the SPP/LSP effects. The ability to generate a spherical wavefront or nondiffracting Bessel beam by an array of gold (Au)_ V-shaped nanoantennas with different geometries and dimensions has been experimentally demonstrated at telecom wavelengths. [13] A dual-polarity metalens consisting of an array of plasmonic dipole antennas on a glass substrate with various orientations has also been experimentally demonstrated, in which a convex or concave lens can be realized with an opposite circular polarized illumination, i.e., either left-handed circular polarization (LCP) or right-handed circular polarization (RCP). [14] Using the similar plasmonic dipoles made of subwavelength metallic nanorods with spatially varying orientations, high-resolution 3D holography can also be achieved. [25] Unlike the plasmonic lens, the all-dielectric metalens based on Mie resonances can also achieve focusing with high efficiency, and a metalens with Si elliptical disks with different dimensions embedded in glass substrate was proposed for this purpose. [15] Recently, the P-B phase has attracted much attention and has been employed in focusing/imaging of the optical metasurface. Unlike the propagation phase, the P-B phase is achieved using azimuth-varied nano/micrograting structures. [26,27] Each nano/microunit (metamolecule) of the metalens is similar to a local half-wave plate (HWP) with different azimuthal angle (θ), so that the circular polarization state of the transmission or reflection is orthogonal to that of the A chiral metalens of circular polarization dichroism (CPD) in the mid-infrared region of 3-5 µm is demonstrated both theoretically and experimentally, in which one of the circularly polarized light beams (either left-handed or righthanded) is transmissively focused at a designed focal length, while the other beam is reflected. The metalens consists of subwavelength helical surface arrays covered by a gold thin film that gives r...

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Spiniform phase-encoded metagratings entangling arbitrary rational-order orbital angular momentum

Cited by 106 publications

References 66 publications

Spatial multiplexing plasmonic metalenses based on nanometer cross holes

Spatial multiplexing plasmonic metalenses based on nanometer cross holes

On‐Chip Detection of Orbital Angular Momentum Beam by Plasmonic Nanogratings

Chiral Metalens of Circular Polarization Dichroism with Helical Surface Arrays in Mid‐Infrared Region

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