Multiwavelength polarization-insensitive lenses based on dielectric metasurfaces with meta-molecules

Arbabi, Ehsan; Arbabi, Amir; Kamali, Seyedeh Mahsa; Horie, Yu; Faraon, Andrei

doi:10.1364/optica.3.000628

Cited by 414 publications

(313 citation statements)

References 43 publications

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“…Although our flat lens is not aberration-free, there are strategies to reduce comatic [18,19] and chromatic aberrations [20][21][22][23][24][25] of flat lenses. We envision that our flat lenses will complement or replace various conventional optical components in systems for IR imaging, ranging, and detection, as well as for beam shaping of IR lasers and beacons.…”

Section: Discussionmentioning

confidence: 99%

High efficiency near diffraction-limited mid-infrared flat lenses based on metasurface reflectarrays

Zhang¹,

Kim²,

Aieta³

et al. 2016

Opt. Express

119

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A limiting factor in the development of mid-infrared optics is the lack of abundant materials that are transparent, low cost, lightweight, and easy to machine. In this paper, we demonstrate a metasurface device that circumvents these limitations. A flat lens based on antenna reflectarrays was designed to achieve near diffraction-limited focusing with a high efficiency (experiment: 80%; simulation: 83%) at 45 o incidence angle at λ = 4.6 μm. This geometry considerably simplifies the experimental arrangement compared to the common geometry of normal incidence which requires beam splitters. Simulations show that the effect of comatic aberrations is small compared to parabolic mirrors. The use of single-step photolithography allows large scale fabrication.

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Section: Discussionmentioning

confidence: 99%

High efficiency near diffraction-limited mid-infrared flat lenses based on metasurface reflectarrays

Zhang¹,

Kim²,

Aieta³

et al. 2016

Opt. Express

119

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“…Although this concept [6] has been initially explored in connection with plasmonic materials [3,4], attention has now turned towards all-dielectric metasurfaces [7][8][9][10]. Such high refractive index dielectric nanoantenna arrays can also be considered as two dimensional high-index contrast subwavelength diffraction gratings; various optical wavefront manipulation possibilities have been demonstrated with these so called HCTA (high contrast transmit arrays) [11][12][13]. In the microwave region, low-profile transmitarrays are also of interest for a variety of applications [14].…”

Section: Introductionmentioning

confidence: 99%

Rapid Design of Wide-Area Heterogeneous Electromagnetic Metasurfaces Beyond the Unit-Cell Approximation

Donda¹,

Hegde²

2017

PIER M

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Abstract-We propose a novel numerical approach for the optimal design of wide-area heterogeneous electromagnetic metasurfaces beyond the conventionally used unit-cell approximation. The proposed method exploits the combination of Rigorous Coupled Wave Analysis (RCWA) and global optimization techniques (two evolutionary algorithms namely the Genetic Algorithm (GA) and a modified form of the Artificial Bee Colony (ABC with memetic search phase method) are considered). As a specific example, we consider the design of beam deflectors using all-dielectric nanoantennae for operation in the visible wavelength region; beam deflectors can serve as building blocks for other more complicated devices like metalenses. Compared to previous reports using local optimization approaches, our approach improves device efficiency; transmission efficiency is especially improved for wide deflection angle beam deflectors. The ABC method with memetic search phase is also an improvement over the more commonly used GA as it reaches similar efficiency levels with a 35% reduction in computation time. The method described here is of interest for the rapid design of a wide variety of electromagnetic metasurfaces irrespective of their operational wavelength.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] In the case of flat lenses, metasurface have been usually designed by mapping the required phase distribution onto a function of the characteristic parameters of the basic scattering elements, e.g. sizes of the dielectric resonators, 1,5,7,10,11 orientation of the dielectric posts, 16 local period of plasmonic gratings. 13 The desired phase distributions are derived by means of analytic/numerical techniques, based on the knowledge of the incoming and desired outgoing wavefront at the lens surface.…”

Section: Introductionmentioning

confidence: 99%

Robust design of microlenses arrays employing dielectric resonators metasurfaces

2017

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In the last years, much interest has grown around the concept of optical surfaces employing high contrast dielectric resonators. However, a systematic approach for the design of this optical surfaces under particular requirements has never been proposed. In this contribution, we describe this approach applied to the robust design of an array of microlenses characterized by a numerical aperture of NA=0.19 with a field of view of FOV = ±60 mrad in a bandwidth of 20 nm. Typically, dielectric resonators are engineered in such a way to have almost full transmissive surfaces with locally tunable phase. However, considering the multiple wavelengths and angles under which the lenses may work, it is difficult to get uniform transmission characteristics for all the dielectric resonators employed. The design strategy, here proposed, uses a particle swarm optimization routine to find the best resonator distribution able to meet the requirements considering the amplitude and phase dispersive characteristics of the resonators surfaces. In the optimization process, also the effects of possible manufacturing inaccuracies, such as variations of resonators radii, are taken into account, allowing a robust design of the structure, within the given manufacturing tolerances. Different designs, operating at 405 nm and 635 nm, are presented and their performances are discussed.

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Multiwavelength polarization-insensitive lenses based on dielectric metasurfaces with meta-molecules

Cited by 414 publications

References 43 publications

High efficiency near diffraction-limited mid-infrared flat lenses based on metasurface reflectarrays

High efficiency near diffraction-limited mid-infrared flat lenses based on metasurface reflectarrays

Rapid Design of Wide-Area Heterogeneous Electromagnetic Metasurfaces Beyond the Unit-Cell Approximation

Robust design of microlenses arrays employing dielectric resonators metasurfaces

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