Monolayer Chiral Metasurface for Generation of Arbitrary Cylindrical Vector Beams

Chen, Qian; Liu, Peijun; Fu, Yanan; Zhang, Shuoshuo; Zhang, Yuquan; Yuan, Xiaocong; Min, Changjun

doi:10.3390/photonics11010057

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…We next discuss the metasurface used to generate the solenoid beam. Metasurfaces, consisting of subwavelength structures engineered to manipulate light, have emerged as powerful tools in optics, demonstrating versatility in various applications such as second and third harmonic generation, − metalenses − and metaholograms. − Recently, metasurfaces have also been used to generate vortex beams, adding to their extensive range of capabilities. − Our metasurface is a Pancharatnam–Berry type (i.e., geometric phase) and based on a-Si nanopillar meta-atoms. Efficient incident beam phase modulation thus requires that the meta-atom should act like a halfwave plate. , A schematic illustration of the meta-atom is shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

High Efficiency Triple-Helix Solenoid Beam Generated by Dielectric Metasurface

Setareh,

De Gille,

Cadusch

et al. 2024

ACS Photonics

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Solenoid beams are structured beams exhibiting patterns of light that rotate around the axis of propagation. They can exert forces on objects in a direction opposite to the light propagation direction and are thus referred to as tractor beams. Previous studies have produced solenoid beams using spatial light modulators (SLMs), but cost, weight, and size limit their widespread application. Here, we experimentally demonstrate a silicon metasurface that generates a triple helix solenoid beam. The beam is equivalent to the superposition of Bessel beams with orbital angular momentum (OAM) values of −10 and −7 and internal angles of 0.005 and 0.004 rad, respectively. Our metasurface demonstrates a diffraction efficiency of >90% and a transmission of >75%, a significant improvement over SLMs. We map the beam's intensity profile at up to ∼21 cm from the metasurface, showing its triple helix profile with negligible diffraction. We furthermore experimentally investigate interference between the solenoid beam and a Gaussian beam. This allows us to unravel the OAM information embedded in our two-component solenoid beam.

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Section: Resultsmentioning

confidence: 99%

High Efficiency Triple-Helix Solenoid Beam Generated by Dielectric Metasurface

Setareh,

De Gille,

Cadusch

et al. 2024

ACS Photonics

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“…The results obtained in this work can be employed for nanostructuring polarizationsensitive materials [17][18][19][20][21], for magnetization and data recording based on the inverse Faraday effect [22][23][24][25], for manipulating microparticles [26][27][28] as well as in optical microscopy [29][30][31].…”

mentioning

confidence: 92%

Transverse Spin Hall Effect and Twisted Polarization Ribbons at the Sharp Focus

Kotlyar,

Kovalev,

Telegin

et al. 2024

Applied Sciences

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In this work, using a Richards-Wolf formalism, we derive explicit analytical relationships to describe vectors of the major and minor axes of polarization ellipses centered in the focal plane when focusing a cylindrical vector beam of integer order n. In these beams, the major axis of a polarization ellipse is found to lie in the focal plane, with the minor axis being perpendicular to the focal plane. This means that the polarization ellipse is perpendicular to the focal plane, with its polarization vector rotating either clockwise or anticlockwise and forming “photonic wheels”. Considering that the wave vector is also perpendicular to the focal plane, we conclude that the polarization ellipse and the wave vector are in the same plane, so that at some point these can coincide, which is uncharacteristic of transverse electromagnetic oscillations. In a cylindrical vector beam, the spin angular momentum vector lies in the focal plane, so when making a circle centered on the optical axis, at some sections, the handedness of the spin vector and circular motion are the same, being opposite elsewhere. This effect may be called an azimuthal transverse spin Hall effect, unlike the familiar longitudinal spin Hall effect found at the sharp focus. The longitudinal spin Hall effect occurs when opposite-sign longitudinal projections of the spin angular momentum vector are spatially separated in the focal plane. In this work, we show that for the latter, there are always an even number of spatially separated regions and that, when making an axis-centered circle, the major-axis vector of polarization ellipse forms a two-sided twisted surface with an even number of twists.

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Optical spin and orbital Hall effects at the tight focus of the superposition of two coaxial cylindrical vector beams with different-parity numbers

Kotlyar,

Kovalev,

Stafeev

et al. 2024

J. Opt. Soc. Am. A

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We study properties of a light field at the tight focus of the superposition of two different-order cylindrical vector beams (CVBs). In the source plane, this superposition has a polarization singularity index amounting to the half-sum of the numbers of two constituent CVBs, while having neither spin angular momentum (SAM) nor transverse energy flow. We show that if the constituent CVBs have different-parity numbers, in the focal plane there occur areas that have opposite-sign longitudinal SAM projections, alongside areas of opposite-handed energy flows rotating on closed paths (clockwise and anticlockwise). The observed phenomena indicate that longitudinal optical spin/orbital Hall effects occur in the focal plane. It is found that if the two constituent CVBs have the same-parity numbers, in the focal plane the light field is inhomogeneously linearly polarized and the energy flow (Umov-Poytning vector) has just a longitudinal component. It is also shown that in the focal plane, the intensity of the on-axis superposition of two opposite-parity CVBs is defined by the sum of the constituent beams’ intensities, as though the two beams would be orthogonally polarized. Meanwhile, in the source plane, the beams under study are not orthogonally polarized and the relation for the intensity contains an interference term.

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Monolayer Chiral Metasurface for Generation of Arbitrary Cylindrical Vector Beams

Cited by 3 publications

References 25 publications

High Efficiency Triple-Helix Solenoid Beam Generated by Dielectric Metasurface

High Efficiency Triple-Helix Solenoid Beam Generated by Dielectric Metasurface

Transverse Spin Hall Effect and Twisted Polarization Ribbons at the Sharp Focus

Optical spin and orbital Hall effects at the tight focus of the superposition of two coaxial cylindrical vector beams with different-parity numbers

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