Pure and achromatic spin-orbit shaping of light from Fresnel reflection off space-variant anisotropic media

Nassiri, Mikaël Ghadimi; Brasselet, Étienne

doi:10.1103/physreva.99.013836

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…Still, we notice that anisotropic Fresnel reflection is not necessarily a drawback as it can be turned into a way to achieve pure ultrabroadband geometric phase reflective masks. [ 21 ] All these points allows understanding why the experimentally measured parameter T (the c −σ ‐polarized power transmittance) is substantially smaller (by an amount of 35% on average for the three explored structures) than the experimentally measured parameter η, see Table 1. Of course, this also motivates for further improvements.…”

Section: Discussionmentioning

confidence: 90%

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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Section: Discussionmentioning

confidence: 90%

Spin‐Orbit Modal Optical Vortex Beam Shaping from Dielectric Metasurfaces

Jin

Sanchez-Padilla

et al. 2022

Advanced Optical Materials

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“…Of late, generation of achromatic optical vortices has been recieving wide interest, owing to their applications primarily in the field of astronomical coronagraphy 32–35 . While different achromatic methods of achieving optical vortices have been proposed 36–39 , achromatic q-plates have received scant attention 40–45 .…”

Section: Introductionmentioning

confidence: 99%

Wavelength-adaptable effective q-plates with passively tunable retardance

Kadiri

Raghavan

2019

Sci Rep

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Wave retarders having spatially varying optical axes orientations, called q-plates are extremely efficient devices for converting spin to orbital angular momentum of light and for the generation of optical vortices. Most often, these plates are designed for a specific wavelength and have a homogeneous constant retardance. The present work provides a polarimetric approach for overcoming both these limitations. We theoretically propose and experimentally demonstrate q-plates with tunable retardance, employing a combination of only standard q-plates and waveplates. A clear prescription is provided for realizing wavelength indepedent q-plates for a desired retardance, with a potential for ultrafast switching. Apart from the potential commercial value of the proposed devices, our results may find applications in quantum communication protocols, astronomical coronography, angular momentum sorting and in schemes that leverage optical vortices and spin to orbital angular momentum conversion.

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Vectorial vortex generation and phase singularities upon Brewster reflection

et al. 2019

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We experimentally demonstrate the emergence of a purely azimuthally polarized vectorial vortex beam with a phase singularity upon Brewster reflection of focused circularly polarized light from a dielectric substrate. The effect originates from the polarizing properties of the Fresnel reflection coefficients described in Brewster's law. An astonishing consequence of this effect is that the reflected field's Cartesian components acquire local phase singularities at Brewster's angle. Our observations are crucial for polarization microscopy and open new avenues for the generation of exotic states of light based on spin-to-orbit coupling, without the need for sophisticated optical elements.

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Pure and achromatic spin-orbit shaping of light from Fresnel reflection off space-variant anisotropic media

Cited by 4 publications

References 31 publications

Spin‐Orbit Modal Optical Vortex Beam Shaping from Dielectric Metasurfaces

Spin‐Orbit Modal Optical Vortex Beam Shaping from Dielectric Metasurfaces

Wavelength-adaptable effective q-plates with passively tunable retardance

Vectorial vortex generation and phase singularities upon Brewster reflection

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