Laguerre-Gaussian quasi-modal q-plates from nanostructured glasses

Rafayelyan, Mushegh; Gertus, Titas; Brasselet, Étienne

doi:10.1063/1.4990954

Cited by 16 publications

(7 citation statements)

References 13 publications

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“…Nanostructured silica glass devices have also been proposed to produce pure vortex beams . However, the devices are restricted to using circularly polarized incident fields, with their practical demonstration being limited to generating vortex beams with low OAM values. , On the other hand, vortex beams of high OAM charge and purity have been generated using a two-step process, which combines the high resolution of metasurfaces with complex amplitude modulation achieved using a spatial light modulator to correct for the missing amplitude term …”

Section: Introductionmentioning

confidence: 99%

Radially and Azimuthally Pure Vortex Beams from Phase-Amplitude Metasurfaces

et al. 2023

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To exploit the full potential of the transverse spatial structure of light using the Laguerre–Gaussian basis, it is necessary to control the azimuthal and radial components of the photons. Vortex phase elements are commonly used to generate these modes of light, offering precise control over the azimuthal index but neglecting the radially dependent amplitude term, which defines their associated corresponding transverse profile. Here, we experimentally demonstrate the generation of high-purity Laguerre–Gaussian beams with a single-step on-axis transformation implemented with a dielectric phase-amplitude metasurface. By vectorially structuring the input beam and projecting it onto an orthogonal polarization basis, we can sculpt any vortex beam in phase and amplitude. We characterize the azimuthal and radial purities of the generated vortex beams, reaching a purity of 98% for a vortex beam with l =50 and p = 0. Furthermore, we comparatively show that the purity of the generated vortex beams outperforms those generated with other well-established phase-only metasurface approaches. In addition, we highlight the formation of “ghost” orbital angular momentum orders from azimuthal gratings (analogous to ghost orders in ruled gratings), which have not been widely studied to date. Our work brings higher-order vortex beams and their unlimited potential within reach of wide adoption.

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Section: Introductionmentioning

confidence: 99%

Radially and Azimuthally Pure Vortex Beams from Phase-Amplitude Metasurfaces

et al. 2023

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“…where the output beam waist radius satisfies w out < w in , which ensures that the denominator of Equation (3) does not diverge, and where the material structuring azimuthal index l′ satisfies l = σl′. Such an approach to modal beam shaping based on the spin-orbit interaction of light has been previously investigated experimentally using optically nanostructured silica glass [13,14] or metallic metasurfaces. [15] It has also given rise to recent theoretical discussions.…”

Section: Introductionmentioning

confidence: 99%

Spin‐Orbit Modal Optical Vortex Beam Shaping from Dielectric Metasurfaces

Jin

Sanchez-Padilla

et al. 2022

Advanced Optical Materials

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works in the 1960s on optical resonators the emergence of optical vortex modes associated with on-axis optical phase singularities and ensuing doughnut shaped intensity patterns. [1] The underlying helical-shaped equiphase surfaces for the light field remained barely studied for almost three decades, though the fabrication of helical phase plates [2] and the interferometric assessment of beams with helical phase profile [3] date back to the 1970s. Optical waves rotating around a phase singularity has only been articulated in the late 1980s. [4] Soon after, within a paraxial wave optics framework, Laguerre-Gauss beams have been recognized as a basis made out of optical vortex modes carrying an integer multiple of ℏ of optical orbital angular momentum per photon, [5] which kick-started a wealth of fundamental and technological developments that are still ongoing. The generation of Laguerre-Gauss beams involves the shaping of azimuthal and radial degrees of freedom (respectively labeled by the indices l ∈ Z and p ∈ N )-according to the paraxial expression of the electric field in the cylindrical coordinate system (r, φ, z

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“…27 However, the devices are restricted to using circularly polarized incident fields, with their practical demonstration being limited to generating vortex beams with low OAM values. 28,29 On the other hand, vortex beams of high OAM charge and purity have been generated using a two step process, which combines the high resolution of metasurfaces with complex amplitude modulation achieved using a spatial light modulator to correct for the missing amplitude term. 14 Here, using polarization as a drop-port, we experimentally demonstrate a generalized method to generating LG modes of high radial and azimuthal purity, which we achieve using a single dielectric metasurface -called the p-plate.…”

mentioning

confidence: 99%

Radially and azimuthally pure vortex beams from phase-amplitude metasurfaces

Oliveira¹,

Piccardo²,

Eslami³

et al. 2022

Preprint

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To exploit the full potential of the transverse spatial structure of light using the Laguerre-Gaussian basis, it is necessary to control the azimuthal and radial components of the photons. Vortex phase elements are commonly used to generate these modes of light, offering precise control over the azimuthal index but neglect the radially dependent amplitude term which defines their associated corresponding transverse profile.Here we experimentally demonstrate the generation of high purity Laguerre-Gaussian beams with a single step on-axis transformation implemented with a dielectric phaseamplitude metasurface. By vectorially structuring the input beam and projecting it onto an orthogonal polarisation basis, we can sculpt any vortex beam in phase and amplitude. We characterize the azimuthal and radial purity of the generated vortex beams, reaching a purity of 98% for a vortex beam with = 50 and p = 0. Furthermore, we comparatively show that the purity of the generated vortex beams outperform

show abstract

Laguerre-Gaussian quasi-modal q-plates from nanostructured glasses

Cited by 16 publications

References 13 publications

Radially and Azimuthally Pure Vortex Beams from Phase-Amplitude Metasurfaces

Radially and Azimuthally Pure Vortex Beams from Phase-Amplitude Metasurfaces

Spin‐Orbit Modal Optical Vortex Beam Shaping from Dielectric Metasurfaces

Radially and azimuthally pure vortex beams from phase-amplitude metasurfaces

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