Controlling the plasmonic orbital angular momentum by combining the geometric and dynamic phases

Tan, Qilong; Guo, Qinghua; Liu, Hong‐Chao; Huang, Xuguang; Zhang, Shuang

doi:10.1039/c7nr00124j

Cited by 65 publications

(44 citation statements)

References 49 publications

(42 reference statements)

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“…Some approaches have been developed to manifest these phenomena, such as the quantum weak measurements detecting the spin‐related weak values, and the multiplying processes using consecutive reflections or spirals to amplify the photonic SOI . Recently, metasurfaces, a novel type of artificial interfaces consisting of a monolayer of planar metallic, or dielectric meta‐atoms, have shown great capabilities to fully control the local wavefront of light and effectively enhance the photonic SOI in nanoscale, such as the photonic spin‐Hall effects, and the spin‐to‐vortex conversion . Thus, metasurfaces can be designed as an efficient platform for the demonstration of enhanced photonic SOI.…”

Section: Introductionmentioning

confidence: 99%

Probing the Photonic Spin–Orbit Interactions in the Near Field of Nanostructures

Sun

Bai

Wang

et al. 2019

Adv Funct Materials

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Photonic spin-orbit interactions (SOI) provide a new design paradigm of functional nanomaterials and nanostructures, and have especially accelerated advances in spin-orbit photonics. The berry phase or the geometric phase, a salient property of SOI, plays a vital role in this process. Thus, the char acterization of photonic SOI processes together with the Berry phase is highly demanded for studies such as the optical spinHall effect, spintovortex conversion, and Rashba effect. Here, a spinselective and phaseresolved near field microscopic method is proposed and experimentally demonstrated for realtime probing and direct visualization of photonic SOI at mesoscale, and a 3D tomographic technique for imaging the spatial evolutions of the optical phases is also properly realized. By analyzing a metallic metasurface as a spin tovortex conversion platform, the abrupt geometric phase and the spatially evolutional dynamic phases are directly measured and intuitively illustrated. This work provides a powerful tool for the study of spin-orbit phenomena in nearfield optics, and can hold the promise for directly exploring the spin dependent surface states in plasmonics and photonic topological insulators.

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Section: Introductionmentioning

confidence: 99%

Probing the Photonic Spin–Orbit Interactions in the Near Field of Nanostructures

Sun

Bai

Wang

et al. 2019

Adv Funct Materials

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“…Recently, plasmonic vortices generated through excitation of surface plasmons (SPs) with azimuthal‐dependent phase profiles e ilθ at a metal‐dielectric interface have attracted considerable attention due to their strong OAM in the evanescent field region. In particular, Archimedean spirals and well‐arranged subwavelength resonators have been employed to achieve spin‐to‐plasmonic‐orbital angular momentum conversion, providing useful insights into the nature of OAM and opening the door toward a number of exciting on‐chip applications . In most of these works, the incident LCP and RCP waves were transformed to plasmonic vortices of different topological charges, and the associated spin‐dependent phenomena can be regarded as the photonic spin‐Hall effect .…”

mentioning

confidence: 99%

Coupling‐Mediated Selective Spin‐to‐Plasmonic‐Orbital Angular Momentum Conversion

et al. 2019

Advanced Optical Materials

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their axis of propagation like a corkscrew, and possess a "doughnut" intensity profile. [3] In the past few decades, many demonstrations and applications of vortex beams have been reported, including optical data storage, [4,5] optical tweezers, [6] quantum cryptography, [7] communications, [8,9] etc. Particularly, geometric phase devices composed of basic elements with a spatially varying orientation could perform spin-to-orbital angular momentum conversion, [10][11][12][13][14] providing a direct connection between optical SAM and OAM. [15] Recently, plasmonic vortices generated through excitation of surface plasmons (SPs) with azimuthal-dependent phase profiles e ilθ at a metal-dielectric interface have attracted considerable attention [16][17][18][19][20][21][22] due to their strong OAM in the evanescent field region. In particular, Archimedean spirals [16][17][18]22] and well-arranged subwavelength resonators [19][20][21] have been employed to achieve spin-toplasmonic-orbital angular momentum conversion, providing useful insights into the nature of OAM and opening the door toward a number of exciting on-chip applications. [17,23] In most of these works, the incident LCP and RCP waves were transformed to plasmonic vortices of different topological charges, and the associated spin-dependent phenomena can be regarded as the photonic spin-Hall effect. [24][25][26] In direct analogy with the Orbital angular momentum (OAM) has been recently introduced to plasmonics for generating plasmonic vortices with a helical wavefront, opening avenues for exotic on-chip applications such as quantum information processing and communications. In previous demonstrations, carefully designed optical elements are used to convert left-and right-circular polarizations into plasmonic vortices with different topological charges, resulting in conversion from optical spin angular momentum (SAM) to plasmonic OAM. Here, it is demonstrated theoretically and experimentally that by utilizing the near-field coupling between paired resonators in a metasurface, selective conversion from optical SAM to plasmonic OAM is realized, where generation of plasmonic vortices can be achieved for incident light of one circular polarization while significantly suppressed for the other circular polarization. The proposed design scheme may motivate the design and fabrication of future practical plasmonic devices. PlasmonicsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.Light carries coordinate-independent spin angular momentum (SAM) [1] of ±ħ per photon, corresponding to left-and rightcircular polarizations (LCP and RCP), where ħ is the reduced Planck's constant. In the pioneering work by Allen et al., [2] it was shown that electromagnetic fields with a phase profile e ilθ could also carry orbital angular momentum (OAM), where l and θ are the topological charge and azimuth angle, respectively. Such beams, known as optical vortices, rotate around

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“…For example, by exploiting width‐chirp concentric gratings (see Figure a), the geometric phase and plasmon retardation phase are combined at a continuously shaped metasurface for the first time to generate fractional OAM . Similarly, controlling plasmonic orbital angular momentum has been achieved by combining geometric and dynamic phase induced by plasmon propagation within the surface . By merging the propagation and geometric phase shifts in dielectric metasurfaces, spin‐dependent transmission and complete control of phase and polarization have been demonstrated with high efficiency.…”

Section: Functional Metasurfaces For Engineering Applicationsmentioning

confidence: 99%

Subwavelength Optical Engineering with Metasurface Waves

Luo

2018

Advanced Optical Materials

163

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Figure 3. Plasmonic superlens and hyperlens. a) Plasmonic EYI effect in structured metal film. Adapted with permission. [46] Copyright 2004, American Institute of Physics (AIP). b) Schematic of the optical system for the demonstration of thin film superlens. Adapted with permission. [49] Figure 11. Multifunctional metasurfaces. a) The far-field intensity distribution of wave-fronts with positive (red) and negative (blue) helicities emerging from segmented, interleaved, and harmonic response metasurfaces composed of gap-plasmon nanoantennas (inset). Adapted with permission. [167] Copyright 2016, AAAS. b) Schematic of the generation of a solid and a hollow spot at two wavelengths and the calculated intensity distribution in the focal plane. Adapted with permission. [12]

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Controlling the plasmonic orbital angular momentum by combining the geometric and dynamic phases

Cited by 65 publications

References 49 publications

Probing the Photonic Spin–Orbit Interactions in the Near Field of Nanostructures

Probing the Photonic Spin–Orbit Interactions in the Near Field of Nanostructures

Coupling‐Mediated Selective Spin‐to‐Plasmonic‐Orbital Angular Momentum Conversion

Subwavelength Optical Engineering with Metasurface Waves

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