Dual-Helicity Decoupled Coding Metasurface for Independent Spin-to-Orbital Angular Momentum Conversion

Ding, Ge; Chen, Ke; Luo, Xinyao; Zhao, Junming; Jiang, Tian; Feng, Yijun

doi:10.1103/physrevapplied.11.044043

Cited by 160 publications

(109 citation statements)

References 50 publications

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“…Here, l represents the topology charge of the generated vortex beam, while θ r and k 0 depict the deflection angle and the wave number in free space, respectively. Assume

θ_{normalr} \neq 0

and discretize the phase profile into 1‐bit coding sequence by employing the discreteness criteria of

Φ (x, y) = \{\begin{matrix} \begin{matrix} 0, & 0 \leq Φ (x, y) < 180^{\circ} \end{matrix} \\ \begin{matrix} 180^{\circ}, & 180^{\circ} \leq Φ (x, y) < 360^{\circ} \end{matrix} \end{matrix}

In this way, twin vortex beams with opposite deflection angles and opposite topology modes of OAM can be generated . By encoding different coding sequences, OAM beams with distinct topology charges can be generated as desired.…”

Section: Concept and Meta‐atom Designmentioning

confidence: 99%

“…To overcome the limitations of dual‐spin‐locked wavefront control, a pioneering hybrid method combining both geometric and propagation phases has been introduced to impart independent phase profiles onto any of the two orthogonal polarization states (linear, circular, or elliptical) . This hybrid method has facilitated the creation of entirely new, flat meta‐devices capable of independently and arbitrarily manipulating left‐hand circular polarization (LHCP) and right‐hand circular polarization (RHCP) waves, and a few interesting functionalities have also been implemented ranging from microwave to optical regime, such as independent chiral holograms, spin‐decoupled vortex beam generator, and versatile bi‐functional devices with extremely low polarization cross‐talk .…”

Section: Introductionmentioning

confidence: 99%

“…Owing to its design flexibility and versatility, spin‐decoupled metasurface provides opportunities to go beyond what is achievable by conventional ones. However, such schemes rely on the anisotropic meta‐atoms exhibiting independent, continuous and full phase coverage for orthogonally linear polarizations, making it very challenging to maintain linear phase dispersions and high efficiency over a broad range of wavelengths. Thus, the existing works only show limited bandwidth (typically <40%, see Table S1, Supporting Information) that is still not broad enough for some practical purposes, for example, full‐color imaging (>1 octave bandwidth), and there is still a lack of efficient design rule for meta‐atoms operated with ultra‐broad bandwidth.…”

Section: Introductionmentioning

confidence: 99%

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Ultrawideband Spin‐Decoupled Coding Metasurface for Independent Dual‐Channel Wavefront Tailoring

et al. 2020

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Achieving distinct functionalities for electromagnetic (EM) waves with opposite handedness in a broad frequency range is highly desirable and essential for modern wireless communications and radar stealth. However, available functional meta‐devices still suffer from the issues of locked functionalities or spin‐decoupled properties but with limited bandwidth. Here, a spin‐decoupled coding metasurface is presented for achieving independently spin‐controlled functionalities with high efficiency in an ultrawide frequency band. By synthesizing the Jones matrix, it is predicted that two half‐wave plates with a phase difference of 90° can form a 1‐bit coding metasurface operating for orthogonal spins independently. As proofs of concept, two meta‐devices are implemented by the metasurface in the microwave region. The first meta‐device performs as a spin‐decoupled beam deflector while the second one shows an ability to generate spin‐decoupled multi‐beams carrying desired orbital angular momentums. Both of the designed meta‐devices can operate in the whole band of 7.5–18.5 GHz (with relative bandwidth of 80%), which, to the best knowledge, is so far the broadest bandwidth that can be achieved by spin‐decoupled metasurfaces. This may trigger interest and open opportunities for advanced functional meta‐devices in practical applications, for example, multichannel metasurface antennas, or multifunctional low‐scattering devices in microwave region.

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“…Here, l represents the topology charge of the generated vortex beam, while θ r and k 0 depict the deflection angle and the wave number in free space, respectively. Assume

θ_{normalr} \neq 0

and discretize the phase profile into 1‐bit coding sequence by employing the discreteness criteria of

Φ (x, y) = \{\begin{matrix} \begin{matrix} 0, & 0 \leq Φ (x, y) < 180^{\circ} \end{matrix} \\ \begin{matrix} 180^{\circ}, & 180^{\circ} \leq Φ (x, y) < 360^{\circ} \end{matrix} \end{matrix}

Section: Concept and Meta‐atom Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrawideband Spin‐Decoupled Coding Metasurface for Independent Dual‐Channel Wavefront Tailoring

et al. 2020

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show abstract

“…This feature of metasurfaces makes them suitable for photonic integrated circuits and mass production. Based on metasurfaces, recently, many flat optical devices have been designed and realized including absorbers [4,5], holography [6][7][8], optical vortex generation [7,[9][10][11], Bessel beams [12,13], self-accelerating beams [14,15], beam shaping [16][17][18] and so on.…”

Section: Introductionmentioning

confidence: 99%

Polarization insensitive all-dielectric metasurfaces for the ultraviolet domain

Ahmed¹,

Rahim²,

Maab³

et al. 2020

Opt. Mater. Express

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In recent years, metasurfaces have provided a tempting path to replace conventional optical components where an abrupt phase change is imposed on an incident wave using a periodic array of unit cells. Till date, highly efficient dielectric metasurfaces have been demonstrated in infrared and visible domains. However, due to the lower bandgap of typical dielectric materials, such metasurfaces present strong absorption in the ultraviolet (UV) domain, and thus, hamper their realization at shorter wavelengths. In this paper, we utilize a large bandgap dielectric material, niobium pentoxide (Nb 2 O 5 ), to construct an ultra-thin and compact transmission-type metasurface that manipulates the phase of an incident wave using an array of Nb 2 O 5 nano-cylinder. By the virtue of numerical optimization, complete 2π phase coverage along with the high transmission efficiency (around 88.5%) is achieved at 355nm. Such efficient control over the phase of the incident wave enabled us to realize the polarisation insensitive self-accelerating parabolic, reciprocal, and logarithmic Airy beams (ABs) generating metasurfaces with the efficiency of 70%, 72% and 77%, respectively. In addition to this, we also demonstrate auto focusing Airy optical vortex (AFAOV) generators where the metasurfaces are designed to combine the phase profiles of an abruptly focusing Airy (AFA) beam and that of spiral phase plate (SPP). The AFAOV is generated with efficiency of 70% (for l = 3) and 72% (for l = 5).

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“…[1][2][3][4][5][6][7][8] The reliability and flexibility of wavefront manipulations by metasurfaces within subwavelength thickness then lead to many new physical effects and versatile applications, including anomalous light refraction, [4,5] invisibility cloak, [9] vortex beams, [10,11] and many other functional metadevices. [1][2][3][4][5][6][7][8] The reliability and flexibility of wavefront manipulations by metasurfaces within subwavelength thickness then lead to many new physical effects and versatile applications, including anomalous light refraction, [4,5] invisibility cloak, [9] vortex beams, [10,11] and many other functional metadevices.…”

mentioning

confidence: 99%

Active Anisotropic Coding Metasurface with Independent Real‐Time Reconfigurability for Dual Polarized Waves

Chen

Ding

et al. 2019

Adv Materials Technologies

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admt.201900930.Metasurfaces, planar arrays composed of subwavelength engineered phase-shifting scatters, have been an emerging platform for advanced and functional control of electromagnetic (EM) waves by manipulating the local properties of amplitude, phase, and polarization of the reflected or transmitted waves. [1][2][3][4][5][6][7][8] The reliability and flexibility of wavefront manipulations by metasurfaces within subwavelength thickness then lead to many new physical effects and versatile applications, including anomalous light refraction, [4,5] invisibility cloak, [9] vortex beams, [10,11] and many other functional metadevices. [12][13][14][15][16][17][18][19] Nowadays, with the rapid development of modern wireless and optical technologies, increasing demands on high communication speed/quality, large data storage capacity are urgently required. The information capabilities of the metasurfaces can be

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Dual-Helicity Decoupled Coding Metasurface for Independent Spin-to-Orbital Angular Momentum Conversion

Cited by 160 publications

References 50 publications

Ultrawideband Spin‐Decoupled Coding Metasurface for Independent Dual‐Channel Wavefront Tailoring

Ultrawideband Spin‐Decoupled Coding Metasurface for Independent Dual‐Channel Wavefront Tailoring

Polarization insensitive all-dielectric metasurfaces for the ultraviolet domain

Active Anisotropic Coding Metasurface with Independent Real‐Time Reconfigurability for Dual Polarized Waves

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