Advances in Full Control of Electromagnetic Waves with Metasurfaces

Zhang, Lei; Mei, Sen; Huang, Kun; Qiu, Cheng‐Wei

doi:10.1002/adom.201500690

Cited by 334 publications

(200 citation statements)

References 188 publications

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“…Recently, theoretical and experimental studies have proven that chiral metamaterials242526272829, hyperbolic metamaterials30 and all-dielectric digital metasurfaces3132 can enable asymmetric transmission for circularly and linearly polarized light2933. By judiciously engineering parameters of individual building blocks, such as geometry, size and material, metasurfaces are promising to replace conventional electromagnetic elements in nanophotonic devices3435. However, to the best of our knowledge, few works were concerned with the broadband asymmetric transmission (BAT) in the visible frequency range, and most of the proposed diode-like devices with asymmetric transmission were designed to operate either in a narrow band30 or beyond the visible spectrum range36.…”

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confidence: 99%

Broadband asymmetric light transmission through tapered metallic gratings at visible frequencies

Tang

Liu

et al. 2016

Sci Rep

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Asymmetric transmission phenomenon has attracted tremendous research interest due to its potential applications in integrated photonic systems. Broadband asymmetric transmission (BAT) is a highly desirable but challenging functionality to achieve in the visible regime due to the limitation of material dispersion. In this paper, we propose and numerically demonstrate that a tapered-metal-grating structure (TMGS) can achieve high-contrast BAT spectra covering the entire visible region. The transmission efficiency reaches ~95% for the forward illumination and ~35% for the backward illumination at the same wavelengths, respectively, and the corresponding transmission ratio is larger than 2.5 over a broadband wavelength regime. Such a design with high performance suggests applications for unidirectional optical transmission, optical diode, and so on.

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confidence: 99%

Broadband asymmetric light transmission through tapered metallic gratings at visible frequencies

Tang

Liu

et al. 2016

Sci Rep

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“…8 It is worth mentioning that a single layer of transversally inhomogeneous metasurface only allows for full 2π-phase control of the cross-polarized light component due to their Lorentzianshaped polarizability, and hence drastically limits the efficiency of structure to 25%. 11 Although by using two cascaded surfaces the transmission level might be improved, the accessible range of phase values would intrinsically be limited. 12 By employing a transmit-array of several plasmonic metasurfaces, a moderate efficiency of 25 − 50% could be achieved; however, such structures are quite complex to be fabricated at near-infrared and visible frequency range.…”

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confidence: 99%

Analog optical computing based on a dielectric meta-reflect array

et al. 2016

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In this paper, we realize the concept of analog computing using an array of engineered gradient dielectric meta-reflect-array. The proposed configuration consists of individual subwavelength silicon nanobricks in combination with fused silica spacer and silver ground plane realizing a reflection beam with full phase coverage 2π degrees as well as amplitude range 0 to 1. Spectrally overlapping electric and magnetic dipole resonances, such high-index dielectric metasurfaces can locally and independently manipulate the amplitude and phase of the incident electromagnetic wave. This practically feasible structure overcomes substantial limitations imposed by plasmonic metasurfaces such as absorption losses and low polarization conversion efficiency in the visible range. Using such CMOS-compatible and easily integrable platforms promises highly efficient ultrathin planar wave-based computing systems which circumvent the drawbacks of conventional bulky lens-based signal processors. Based on these key properties and general concept of spatial Fourier transformation, we design and realize broadband mathematical operators such as differentiator and integrator in the telecommunication wavelengths.

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“…Due to the small bandgap, silicon‐based ultraviolet metasurfaces have experimental efficiencies below 30%. Therefore, developing a novel material platform would enable metasurfaces to contribute to the ultraviolet region …”

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confidence: 99%

Ultraviolet Metasurfaces of ≈80% Efficiency with Antiferromagnetic Resonances for Optical Vectorial Anti‐Counterfeiting

Huang

Deng

Leong

et al. 2019

Laser & Photonics Reviews

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Metasurfaces enable the full control of electromagnetic waves over a wide spectrum. High‐efficiency transmissive metasurfaces have been demonstrated up to the visible frequencies by using dielectrics. However, extending the operating spectrum to the ultraviolet range is challenging. This is due to the strong absorption in typical dielectric materials and the inexhaustive understanding of the magnetic resonances in dielectric nanostructures. Here, a large‐bandgap material—niobium pentoxide (Nb2O5)—is introduced to engineer the ultraviolet geometric meta‐holograms to achieve a total efficiency of 79.6% at 355 nm wavelength. The employed orientation‐varying nanobricks, operating as miniaturized half‐waveplates (HWPs), are elaborately designed to excite the antiferromagnetic modes that maintain Ex component of the incident light via even antiparallel magnetic dipoles (AMDs) but reverse Ey component via odd AMDs, thereby unveiling the underlying mechanism of dielectric nano‐HWPs. By adding the polarization degree of freedom, an ultra‐channel meta‐hologram, multiplexing two orthogonal spin channels while exhibiting three outputs, is demonstrated experimentally for ultraviolet vectorial anti‐counterfeiting. This work might open the door toward high‐performance ultraviolet nanophotonics and meta‐optics.

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Advances in Full Control of Electromagnetic Waves with Metasurfaces

Cited by 334 publications

References 188 publications

Broadband asymmetric light transmission through tapered metallic gratings at visible frequencies

Broadband asymmetric light transmission through tapered metallic gratings at visible frequencies

Analog optical computing based on a dielectric meta-reflect array

Ultraviolet Metasurfaces of ≈80% Efficiency with Antiferromagnetic Resonances for Optical Vectorial Anti‐Counterfeiting

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