Twisted non-diffracting beams through all dielectric meta-axicons

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

doi:10.1039/c9nr04888j

Cited by 59 publications

(35 citation statements)

References 49 publications

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“…Through the miniaturization and performance enhancement of bulk optical components, metasurfaces have been used in imaging applications such as resolution-enhanced fluorescence microscopy [ 21 , 22 ] and laser scanning microscopy [ 23 ]. Furthermore, the extraordinary optical properties of metasurfaces enable the perfect absorption of light [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ], and light manipulating applications such as beam splitting [ 31 , 32 , 33 ], verification and enhancement of the spin Hall effect [ 34 , 35 , 36 ], asymmetric transmission [ 37 ], multifunctional waveguides [ 38 ], and other light-manipulation applications [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. In addition, the researches on various materials of the metasurfaces have been actively reported: a metasurface-based solar reflector using vanadium dioxide (VO 2 ) [ 43 , 50 , 51 , 52 , 53 ], a study on the manufacturing of graphene oxide film for anisotropic photoresponse [ 54 ], and the scalable nanostructures of molybdenum disulfide (MoS 2 ) [ 55 ].…”

Section: Introductionmentioning

confidence: 99%

Scalable and High-Throughput Top-Down Manufacturing of Optical Metasurfaces

Lee

et al. 2020

Sensors

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Metasurfaces have shown promising potential to miniaturize existing bulk optical components thanks to their extraordinary optical properties and ultra-thin, small, and lightweight footprints. However, the absence of proper manufacturing methods has been one of the main obstacles preventing the practical application of metasurfaces and commercialization. Although a variety of fabrication techniques have been used to produce optical metasurfaces, there are still no universal scalable and high-throughput manufacturing methods that meet the criteria for large-scale metasurfaces for device/product-level applications. The fundamentals and recent progress of the large area and high-throughput manufacturing methods are discussed with practical device applications. We systematically classify various top-down scalable patterning techniques for optical metasurfaces: firstly, optical and printing methods are categorized and then their conventional and unconventional (emerging/new) techniques are discussed in detail, respectively. In the end of each section, we also introduce the recent developments of metasurfaces realized by the corresponding fabrication methods.

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Section: Introductionmentioning

confidence: 99%

Scalable and High-Throughput Top-Down Manufacturing of Optical Metasurfaces

Lee

et al. 2020

Sensors

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“…Flat surfaces offer arbitrary full-wave manipulation and have been studied extensively in recent years due to their signicant breakthroughs in various elds such as optical activity, [1][2][3] holography, [4][5][6] and optical imaging. [7][8][9] Planar optical structures, specically metalenses, 10,11 have attained tremendous interest across the research community and developed rapidly in context of their functionalities and efficiencies. Novel metasurface-based lenses are ubiquitous for biomedical applications, 12 such as endoscopy and wearable medical devices.…”

Section: Introductionmentioning

confidence: 99%

Engineering tunability through electro-optic effects to manifest a multifunctional metadevice

et al. 2021

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“…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%

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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Twisted non-diffracting beams through all dielectric meta-axicons

Abstract: Polarization insensitive metasurface axicons of hydrogenated amorphous silicon are proposed generating highly concentrated Bessel beams with desired orders. The metasurfaces are designed by index waveguiding and experimentally verified.

Cited by 59 publications

References 49 publications

Scalable and High-Throughput Top-Down Manufacturing of Optical Metasurfaces

Scalable and High-Throughput Top-Down Manufacturing of Optical Metasurfaces

Engineering tunability through electro-optic effects to manifest a multifunctional metadevice

Polarization insensitive all-dielectric metasurfaces for the ultraviolet domain

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