Polarization independent and broadband achromatic metalens in ultraviolet spectrum

Liu, Mian; Xu, Na; Wang, Benxin; Qian, Weiying; Xuan, Bin; Cao, Jianjun

doi:10.1016/j.optcom.2021.127182

Cited by 12 publications

(9 citation statements)

References 34 publications

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“…The unit cells corresponding to 488 nm and 632.8 nm are combined to achieve a dual-wavelength achromatic metalens. Motivated by the spatial multiplexing method [ 10 ], we considered the possibility of segmenting the lens into different zones along the radial direction and using the PSO algorithm to arrange the unit cells in order to obtain achromatic design [ 32 , 34 , 36 , 54 ]. The electric field at the focal spot is determined by the interference of the electric field within each zone and the interference of the electric fields from different zones.…”

Section: Design Principle and Methodsmentioning

confidence: 99%

Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing

Shi

Sun

et al. 2022

Nanomaterials

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Metalenses composed of a large number of subwavelength nanostructures provide the possibility for the miniaturization and integration of the optical system. Broadband polarization-insensitive achromatic metalenses in the visible light spectrum have attracted researchers because of their wide applications in optical integrated imaging. This paper proposes a polarization-insensitive achromatic metalens operating over a continuous bandwidth from 470 nm to 700 nm. The silicon nitride nanopillars of 488 nm and 632.8 nm are interleaved by Fresnel zone spatial multiplexing method, and the particle swarm algorithm is used to optimize the phase compensation. The maximum time-bandwidth product in the phase library is 17.63. The designed focal length can be maintained in the visible light range from 470 nm to 700 nm. The average focusing efficiency reaches 31.71%. The metalens can achieve broadband achromatization using only one shape of nanopillar, which is simple in design and easy to fabricate. The proposed metalens is expected to play an important role in microscopic imaging, cameras, and other fields.

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Section: Design Principle and Methodsmentioning

confidence: 99%

Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing

Shi

Sun

et al. 2022

Nanomaterials

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“…5(a), the solar radiation covers the ultra-broad bandwidths from the NIR region (from 780 nm to 2526 nm) to the deep-UV (DUV) range (from 190 nm to 280 nm) [18,176,177]. According to the aforementioned introduction of the building materials, a meta-lens that is formed using different materials generally operates at the corresponding spectrum, and thereby, we will introduce the high-focusing-efficiency optical meta-lenses in terms of their working wavelengths, including the NIR [169,174,[178][179][180][181][182], visible [134,152,164,165,[183][184][185][186][187], and UV bands [146,148,149,[188][189][190][191][192][193]. The focusing efficiency is defined as the optical power confined within a focal spot divided by the corresponding incident power.…”

Section: Focusing Efficiencymentioning

confidence: 99%

“…Even though ultra-broadband meta-lenses that operate from the visible region to the NIR spectrum have been successfully developed with improved focusing efficiency, there is still a lack of experimental research on broadband UV meta-lenses in relation to processing capability constraints. To date, only a few theoretical studies have been conducted on broadband achromatic UV meta-lenses [188,[190][191][192]. For example, Kanwal et al [188,190] and Liu et al [192] theoretically investigated two types of UV meta-lenses that could react with broadband UV light of 270-380 nm and 300-400 nm.…”

Section: Operation Bandwidthmentioning

confidence: 99%

“…To date, only a few theoretical studies have been conducted on broadband achromatic UV meta-lenses [188,[190][191][192]. For example, Kanwal et al [188,190] and Liu et al [192] theoretically investigated two types of UV meta-lenses that could react with broadband UV light of 270-380 nm and 300-400 nm. These two polarization-independent meta-lenses were composed of cylindrical Si 3 N 4 or AlN nanopillars, respectively, with focusing efficiencies of approximately 40% and 50%.…”

Section: Operation Bandwidthmentioning

confidence: 99%

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Planar metasurface-based concentrators for solar energy harvest: from theory to engineering

et al. 2022

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Solar energy is an inexhaustible renewable energy resource, which is a potential solution to global warming and aids sustainable development. The use of solar-thermal collectors to harness solar energy facilitates low-cost heat storage and can improve the stability of power grids based on renewable energy. In solar-thermal collectors, traditional concentrators, such as parabolic troughs and dishes, are typically used but inevitably require high-precise supports and complex tracking sun systems, which increase the cost of solar-thermal power stations and hinder their further applications. In contrast, planar meta-lenses (so-called metasurface-based concentrators) consisting of two-dimensional nanostructured arrays are allowed to engineer the frequency dispersion and angular dispersion of the incident light through delicately arranging the aperture phase distribution, thereby correcting their inherent aberrations. Accordingly, the novel meta-lenses offer tremendous potentials to effectively capture broadband, wide-angle sunlight without the extra tracking system. This review summarizes the research motivation, design principles, building materials, and large-area fabrication methods of meta-lens for solar energy harvesting in terms of focusing efficiency, operation bandwidth, and angular dependence. In addition, the main challenges and future goals are examined.

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“…However, for the UV Hyperspectral Ozone Detector, there are two drawbacks if depolarizers are used, which affect the instrument’s size and degrade the image quality [ 13 ]. The UV Hyperspectral Ozone Detector consists of a front scanning mirror and a rear optical system.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Correction of Polarization Response Calibration Error of Limb Atmosphere Ultraviolet Hyperspectral Detector

Huang

et al. 2022

Sensors

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A UV hyperspectral instrument was designed with a polarization measurement channel for real-time in-orbit polarization correction to reduce the influence of polarization on the detection accuracy of atmospheric radiation. One of the prerequisites for in-orbit polarization calibration is accurately calibrating the instrument’s polarization properties in the laboratory. This study first introduces the calibration method and measuring device of the polarization characteristics of the ultraviolet (UV) hyperspectral detector and conducts a polarization calibration test of the instrument. The two main error sources introduced by the calibration device were emphatically analyzed, and the correction method of the error sources was deduced theoretically. Finally, the polarization calibration results of the UV hyperspectral detector were corrected, and the uncertainty analysis of the corrected calibration results was about 1.4%, which provides effective ground polarization calibration data for the on-orbit polarization correction of the instrument.

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Polarization independent and broadband achromatic metalens in ultraviolet spectrum

Cited by 12 publications

References 34 publications

Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing

Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing

Planar metasurface-based concentrators for solar energy harvest: from theory to engineering

Analysis and Correction of Polarization Response Calibration Error of Limb Atmosphere Ultraviolet Hyperspectral Detector

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