Thin metalens with high numerical aperture

Kotlyar, V. V.; Nalimov, Anton G.; Stafeev, Sergey S.; О’Faolain, L.; Kotlyar, M. V.

doi:10.18287/2412-6179-2017-41-1-5-12

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…In some cases, may be presented argillite like clay. The ratios of these components may vary, depending on the composition of the initial mining spoil [13][14][15][16]. The chemical composition of screenings (Table 1) has no basic differences from raw clay.…”

Section: Resultsmentioning

confidence: 99%

High performance ceramic stones on the basis of by-products of waste heaps - screenings and coal slurry

et al. 2019

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General description of coal dumps products processing is described: medium factional materials - screenings that do not contain carbon; kiln fractional - coal sand, coal containing up to 30%; petty factional - coal slurries, coal containing up to 50% are given. Ceramic kilns and technological properties of processing coal dumps products are given. Compositions of raw mixtures for obtaining products with a compressive strength of 10-15 MPa and density less than 800 kg / m3, and considering the fact that the molding process is carried out semi-rigid extrusion and the necessity of minimum costs for firing is defined. Depending on the technological properties of screenings, depending on the degree of grinding and firing temperature is taken into account. Flow production of modern equipment is pointed out. Technical and economic indicators showing high profitability and the prospect of large-scale production of clay tiles on the basis of coal dumps processing products due to minimal manufacturing cost are mentioned. The carried out results of the work allowed to choose the raw materials and to develop the technological scheme of production of high-performance ceramic stones with a minimum cost. Implementation of the results in practice will create a highly profitable production and make the Rostov region a major manufacturer of ceramic wall.

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Section: Resultsmentioning

confidence: 99%

High performance ceramic stones on the basis of by-products of waste heaps - screenings and coal slurry

et al. 2019

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“…It should be noted that the focusing efficiency (17.2%) is much higher than the results reported in Refs. [36,51], leading to a more promising application in superresolution imaging and precision machining.…”

Section: Performances Of the Subdiffraction Focusing Metalensmentioning

confidence: 99%

High focusing efficiency in subdiffraction focusing metalens

et al. 2019

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Vector beams with phase modulation in a high numerical aperture system are able to break through the diffraction limit. However, the implementation of such a device requires a combination of several discrete bulky optical elements, increasing its complexity and possibility of the optical loss. Dielectric metalens, an ultrathin and planar nanostructure, has a potential to replace bulky optical elements, but its optimization with full-wave simulations is time-consuming. In this paper, an accurate and efficient theoretical model of planar metalens is developed. Based on this model, a twofold optimization scheme is proposed for optimizing the phase profile of metalenses so as to achieve subdiffraction focusing with high focusing efficiency. Then, a metalens that enables to simultaneously generate radially polarized beam (RPB) and modulate its phase under the incidence of x-polarized light with the wavelength of 532 nm is designed. Full-wave simulations show that the designed metalens of NA = 0.95 can achieve subdiffraction focusing (FWHM = 0.429λ) with high transmission efficiency (77.6%) and focusing efficiency (17.2%). Additionally, superoscillation phenomenon is found, leading to a compromise between the subdiffraction spot and high efficiency. The proposed method may provide an accurate and efficient way to achieve sub-wavelength imaging with the expected performances, which shows a potential application in super-resolution imaging.

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“…Однако в большинстве задач расчета дифракции света параксиального приближения недостаточно. Точный численный расчет распространения света необходим во многих исследованиях в оптике -в цифровой голографии [5], формировании нужного распределения интенсивности пучка [6,7], создании оптического пинцета для задач генной инженерии [8], моделирования работы дифракционных оптических элементов [9], металинз [10], оптических резонаторов [11] и т.д. В этом случае целесообразно использовать, например, метод конечных элементов (МКЭ) [12,13], метод граничных элементов (МГЭ) [14,15], метод конечных разностей во временной области (FDTD-метод) [16 -18], различные интеграль-ные методы расчета распространения света, такие как интеграл Рэлея-Зоммерфельда [19,20], методы разложения по плоским волнам [21], в том числе с различными модификациями -с ограничением полосы [22], широкодиапазонные [23,24], преобразование Ричардса-Вольфа [25] и др.…”

Section: Introductionunclassified

Calculation of the intensity at the sharp focus of a cylindrical vector beam by three methods

Nalimov,

Kotlyar,

Khanenko

2023

Computer Optics

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We conduct a comparative analysis of diffraction fields upon sharply focusing vortex and non-vortex incident beams, calculated using three non-paraxial methods. The methods employed are a finite difference time domain (FDTD) method, a Rayleigh–Sommerfeld integral, and a Richards–Wolf transformation. The Richards–Wolf transformation is used with two apodization functions of the exit pupil, for a spherical lens and a thin diffractive lens. The numerical simulation shows that the Rayleigh–Sommerfeld integral and the Richards–Wolf transformation can produce almost the same result and save time significantly. Meanwhile, the root-mean-square deviation of the results of both methods from the FDTD method can be as low as 2%. If an ultra-short focal length is used, the Richards–Wolf transformation is found to be more accurate, whereas with increasing distance from the initial plane and outside the focal plane, the Rayleigh-Sommerfeld integral is more accurate.

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Thin metalens with high numerical aperture

Cited by 7 publications

References 2 publications

High performance ceramic stones on the basis of by-products of waste heaps - screenings and coal slurry

High performance ceramic stones on the basis of by-products of waste heaps - screenings and coal slurry

High focusing efficiency in subdiffraction focusing metalens

Calculation of the intensity at the sharp focus of a cylindrical vector beam by three methods

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