Bilayer holey plasmonic vortex lenses for the far field transmission of pure orbital angular momentum light states

Zilio, Pierfrancesco; Parisi, G.; Garoli, Denis; Carli, Marta; Romanato, Filippo

doi:10.1364/ol.39.004899

Cited by 30 publications

(31 citation statements)

References 20 publications

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“…For the SPPs the grooves in the surface act as a source of SPPs and the vortex formation can be described by an interference pattern of waves running inside the spiral with the correct phase [2,3,5,7]. A similar equation for the vortex number has also been found [2,4,6,11,24,46]. In the SPP case the vortex manifests in the electric field perpendicular to the surface, while with our positive structure we obtain a vortex in the transverse components of the electric field.…”

Section: Mircometer-sized Spiralsupporting

confidence: 68%

“…Recently it was shown that by grooving Archimedean spiral structures in a gold nano platelet, the surface plasmon polariton (SPP) field forms a vortex in the centre of the structure [1][2][3][4][5][6][7]. The femtosecond dynamics of the formation of the plasmonic vortex can be studied using time-resolved two-photon photoemission electron microscopy [8].…”

Section: Introductionmentioning

confidence: 99%

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Interaction of an Archimedean spiral structure with orbital angular momentum light

et al. 2018

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Complementing the research of surface plasmon polariton vortices for Archimedean spiral structures grooved in gold platelets, we here study the analogous positive structure of an Archimedean spiral consisting of bent gold nanorods. We consider spirals of two different sizes, for which we perform numerical calculations with the boundary element method. For a micrometer-sized metallic structure we show that the scattered electric field forms a vortex in the centre of the spiral. When the spiral is illuminated by orbital angular momentum light, the topological charge of the vortex can be controlled. For a nanometer-sized plasmonic Archimedean spiral we find that the response to optical excitation is governed by several resonances. When the nanostructure is excited by orbital angular momentum light, different resonances appear compared to the excitation with plane waves. Our results highlight that the distinct architecture of the Archimedean spiral responds in a unique way to the excitation with orbital angular momentum light.

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Section: Mircometer-sized Spiralsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Interaction of an Archimedean spiral structure with orbital angular momentum light

et al. 2018

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“…PVLs constitute a powerful tool to manipulate the topological charge of light, enabling to generate, modify and confine OAM 7 8 9 11 . In fact, PVLs not only transform the spin angular momentum (SAM) carried by an incident circularly polarized light beam into the OAM of the PV 17 18 19 20 , but can also impress in principle any amount of AM, depending of the chirality (namely, the number of spiral arms) of the PVL itself. Excited PVs propagating on the metal surface can then interact with nanostructures placed at the center of the PVL, exhibiting a number of interesting optical effects 7 8 9 10 11 .…”

mentioning

confidence: 99%

Optical vortex beam generator at nanoscale level

Garoli¹,

Zilio²,

Gorodetski³

et al. 2016

Sci Rep

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Optical beams carrying orbital angular momentum (OAM) can find tremendous applications in several fields. In order to apply these particular beams in photonic integrated devices innovative optical elements have been proposed. Here we are interested in the generation of OAM-carrying beams at the nanoscale level. We design and experimentally demonstrate a plasmonic optical vortex emitter, based on a metal-insulator-metal holey plasmonic vortex lens. Our plasmonic element is shown to convert impinging circularly polarized light to an orbital angular momentum state capable of propagating to the far-field. Moreover, the emerging OAM can be externally adjusted by switching the handedness of the incident light polarization. The device has a radius of few micrometers and the OAM beam is generated from subwavelength aperture. The fabrication of integrated arrays of PVLs and the possible simultaneous emission of multiple optical vortices provide an easy way to the large-scale integration of optical vortex emitters for wide-ranging applications.

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“…While from the perspective of functional nanostructures for generating OAM, it is evident that performance is imperfect, these measurements highlight that our powerful new measurement method allows for an unprecedented quantification. The performance of the nanostructures in terms of OAM mode purity can be further improved by optimizing the geometrical parameters of the spiral such as the aperture radius or by using metal–insulator–metal arrangements 45 , 46 . Our observation points out that the essential parameter to optimize is the tradeoff between overall transmission efficiency (requires large central aperture) and leakage into OAM = 0, ±2 (requires low direct transmission).…”

Section: Resultsmentioning

confidence: 99%

Quantifying single plasmonic nanostructure far-fields with interferometric and polarimetric k-space microscopy

et al. 2018

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Optically resonant nanoantennae are key building blocks for metasurfaces, nanosensors, and nanophotonic light sources due to their ability to control the amplitude, phase, directivity, and polarization of scattered light. Here, we report an experimental technique for the full recovery of all degrees of freedom encoded in the far-field radiated by a single nanostructure using a high-NA Fourier microscope equipped with digital off-axis holography. This method enables full decomposition of antenna-physics in its multipole contributions and gives full access to the orbital and spin angular momentum properties of light scattered by single nano-objects. Our results demonstrate these capabilities through a quantitative assessment of the purity of the “selection rules” for orbital angular momentum transfer by plasmonic spiral nanostructures.

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Bilayer holey plasmonic vortex lenses for the far field transmission of pure orbital angular momentum light states

Cited by 30 publications

References 20 publications

Interaction of an Archimedean spiral structure with orbital angular momentum light

Interaction of an Archimedean spiral structure with orbital angular momentum light

Optical vortex beam generator at nanoscale level

Quantifying single plasmonic nanostructure far-fields with interferometric and polarimetric k-space microscopy

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