Polarisation insensitive multifunctional metasurfaces based on all-dielectric nanowaveguides

Mahmood, Nasir; Kim, Inki; Mehmood, Muhammad Qasim; Jeong, Hoon Eui; Akbar, Ali; Lee, Dasol; Saleem, Murtaza; Zubair, Muhammad; Anwar, Muhammad Sabieh; Tahir, Farooq A.; Rho, Junsuk

doi:10.1039/c8nr05633a

Cited by 102 publications

(55 citation statements)

References 56 publications

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“…Moreover, operating at a wide band and response for multiple parameters are challenging for the traditional devices. Anisotropic metasurfaces, which work as nanoscale birefringent phase‐shifters, provide an elegant solution to these difficulties. This artificially planar material enables the simultaneous modulation of local phase, amplitude, and polarization of light field in subwavelength scale, molds optical wavefront into arbitrary mode, and facilitates the integration of functional nanodevices.…”

Section: Introductionmentioning

confidence: 99%

Tying Polarization‐Switchable Optical Vortex Knots and Links via Holographic All‐Dielectric Metasurfaces

Guo

Zhong

et al. 2020

Laser & Photonics Reviews

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Tailoring the spatial structure of light field in multiple degrees of freedom is a research hotspot in recent years. The topology of light field, as one of the most fascinating structures, such as vortex knots and links associated with the phase singularities, is evoking increasing attention both in fundamental research and practical application. Here, an all‐dielectric metasurface device is proposed and experimentally demonstrated that can construct vortex knots and links in light field at the micro scale. These two distinct topological configurations can be switched by changing the incident polarization. Utilizing the digital holographic interference method, these topological configurations of vorticity lines are accurately characterized in three‐dimensions, and the topology‐preserving evolution of such ultra‐small fields is demonstrated. These two classical configurations exemplify the capability of multichannel manipulating topology by compact metadevice. The work may promote the application of structured light filed at the micro scale and even the creation of other physical fields with ultra‐small size.

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Section: Introductionmentioning

confidence: 99%

Tying Polarization‐Switchable Optical Vortex Knots and Links via Holographic All‐Dielectric Metasurfaces

Guo

Zhong

et al. 2020

Laser & Photonics Reviews

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“…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%

“…To date, most of the research is focused on infrared and visible domains. Silicon-based metasurfaces have shown the transmission efficiency of >90% at infrared wavelengths [28], while amorphous silicon hydrogenated (a-Si:H) [11,29], titanium oxide (TiO 2 ) [30], gallium nitride (GaN) [31], and silicon nitride (Si 3 N 4 ) [32] exhibit exceptional performance in the visible domain. However, these materials possess a small bandgap at UV range, thus render very low transmission efficiency [33,34].…”

Section: Introductionmentioning

confidence: 99%

“…In this article, the manipulation of phase of impinging wave is performed using Nb 2 O 5 based nano-cylinders. The cylindrical geometry of the unit cell is opted because of its insensitivity to polarization of incident wave [11,36]. The radius of nano-cylinder is varied to attain the complete 2π phase control of incident wave with high transmission efficiency (around 88.5%) at the working wavelength of 355nm (UV domain).…”

Section: Introductionmentioning

confidence: 99%

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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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“…Therefore, metasurfaces offer remarkable promise in realizing both 2D and 3D imaging. Furthermore, they have proved their applicability in beam engineering, data storage, security, communication, and display . There are many accounts where plasmonic metasurfaces have been used to realize holograms.…”

Section: Introductionmentioning

confidence: 99%

A Spin‐Encoded All‐Dielectric Metahologram for Visible Light

Ansari

Kim

Lee

et al. 2019

Laser & Photonics Reviews

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Dielectric materials that are low‐loss in the visible spectrum provide a promising platform to realize the pragmatic features of metasurfaces. Here, all‐dielectric, highly efficient, spin‐encoded transmission‐type metaholograms (in the visible domain) are demonstrated by utilizing hydrogenated amorphous silicon (a‐Si:H). In comparison to previously reported visible metaholograms based on TiO2 and other dielectric materials, all‐dielectric metasurfaces provide a cost‐effective more straightforwardly fabricated (aspect ratio 4.7), CMOS compatible, and comparably efficient solution in the visible domain. A unique way of utilizing polarization as an extra degree of freedom in the design to implement transmission‐type helicity‐encoded metaholograms is also proposed. The produced images exhibit high fidelity under both right and left circularly polarized illuminations. The proposed cost‐effective and CMOS‐compatible material and methods open up an avenue for on‐chip development of numerous new phenomena with high efficiency in the visible domain.

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Polarisation insensitive multifunctional metasurfaces based on all-dielectric nanowaveguides

Cited by 102 publications

References 56 publications

Tying Polarization‐Switchable Optical Vortex Knots and Links via Holographic All‐Dielectric Metasurfaces

Tying Polarization‐Switchable Optical Vortex Knots and Links via Holographic All‐Dielectric Metasurfaces

Polarization insensitive all-dielectric metasurfaces for the ultraviolet domain

A Spin‐Encoded All‐Dielectric Metahologram for Visible Light

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