All-dielectric ultrathin conformal metasurfaces: lensing and cloaking applications at 532 nm wavelength

Cheng, Jierong; Jafar‐Zanjani, Samad; Mosallaei, Hossein

doi:10.1038/srep38440

Cited by 59 publications

(47 citation statements)

References 32 publications

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“…It is worth noting that the alignment of a conformal metasurface to a non-planar substrate needs to be very accurate for achieving the optimal phase compensation through the metasurface. Different groups have investigated the realization of conformal metasurfaces [200,201,240]. Figure 8c shows a simulation for a proof of concept application of conformal metasurfaces for spherical aberration correction [200].…”

Section: B Conformal Metasurfacesmentioning

confidence: 99%

A review of dielectric optical metasurfaces for wavefront control

et al. 2018

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During the past few years, metasurfaces have been used to demonstrate optical elements and systems with capabilities that surpass those of conventional diffractive optics. Here we review some of these recent developments with a focus on dielectric structures for shaping optical wavefronts. We discuss the mechanisms for achieving steep phase gradients with high efficiency, simultaneous polarization and phase control, controlling the chromatic dispersion, and controlling the angular response. Then we review applications in imaging, conformal optics, tunable devices, and optical systems. We conclude with an outlook on future potentials and challenges that need to be overcome. A. High-efficiency high-gradient phase controlSince high-contrast transmitarrays (HCA) are central to the most of the discussions of this section, we first briefly discuss their operation. We are primarily interested in the two-dimensional HCAs, and therefore we consider their case here, although much of the discussions are also valid for the one-dimensional case. In general, these devices are based on high-refractive-index dielectric nano-scatterers surrounded by low-index media [13, 38, 65, 67, 70-72, 76, 78]. The structure can be symmetric (i.e., with the substrate and capping layers having the same refractive indexes) [36] or asymmetric [66,67,76,78]. Depending on the materials and the required phase coverage, the thickness of the high-index layer is usually between 0.5λ 0 and λ 0 , where λ 0 is the free space wavelength. Typically, these structures are designed to be compatible with conventional microfabrication techniques;

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Section: B Conformal Metasurfacesmentioning

confidence: 99%

A review of dielectric optical metasurfaces for wavefront control

et al. 2018

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“…The total thickness of the cloak is only 80 nm (λ∕8), which is a huge advantage of the present scheme. After this work, a series of studies [297,[300][301][302][303][304][305][306] have been conducted to realize polarization-independent, wide-incidence-angle, and/or broadband carpet cloaks based on metasurfaces. For example, Chen's group experimentally demonstrated a full-polarization arbitrarily-shaped 3D metasurface cloak in the microwave regime [297], as shown in Fig.…”

Section: Metasurface-based Cloakingmentioning

confidence: 99%

Electromagnetic metasurfaces: physics and applications

et al. 2019

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H-shaped resonators (inset) are adopted to realize, respectively, the desired B layer with negative ε and A layers with positive ε at the working frequencies [25]. (d) Top and middle panels: interference model and practical design of the metamaterial antireflection coating. Middle panel: experimentally measured reflectance and transmittance spectra for the normal incidence case. The solid and dashed lines represent the reflectance and transmittance of a bare GaAs surface [26]. (a) Figure 1 reprinted with permission from Martín-Moreno et al.,

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“…Flexibility has been previously exploited for MS hologram devices controlled by the degree of substrate stretching, e.g., to vary the color of an MS [24,25], the focus of an MS lens [26], or to alternate between multiple near-field images [27]. A theoretical exploration of flexible MS holograms has also enabled carpet cloaking, and spherical aberration correction for lensing applications [28]. Flexible MSs have also been used to decouple the shape of a lens from its optical function [29].…”

Section: Introductionmentioning

confidence: 99%

Holography Using Curved Metasurfaces

Burch

Falco

2019

Photonics

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In this work, we demonstrate nonflat metasurface holograms with applications in imaging, sensing, and anticounterfeiting. For these holograms, the image and its symmetry properties, with respect to the polarization of the light, depend on the specific shape of the substrate. Additionally, the sensitivity of the holographic image to the substrate shape can be engineered by distributing the phase information into determined areas of the metasurface.

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All-dielectric ultrathin conformal metasurfaces: lensing and cloaking applications at 532 nm wavelength

Cited by 59 publications

References 32 publications

A review of dielectric optical metasurfaces for wavefront control

A review of dielectric optical metasurfaces for wavefront control

Electromagnetic metasurfaces: physics and applications

Holography Using Curved Metasurfaces

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