Directional Janus Metasurface

Chen, Ke; Ding, Ge; Hu, Guangwei; Jin, Zhongwei; Zhao, Junming; Feng, Yijun; Jiang, Tian; Alù, Andrea; Qiu, Cheng‐Wei

doi:10.1002/adma.201906352

Cited by 211 publications

(136 citation statements)

References 65 publications

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“…As well known, single layer transmitted metasurfaces usually exhibit identical electromagnetic (EM) functionalities when changing the propagation direction of incident light based on reciprocal law, which make the directionality features unexploited. For breaking this limitation, some efforts have been devoted in recent years [110][111][112].…”

Section: Janus and Bilayer Metasurfaces Holographymentioning

confidence: 99%

Recent advances in multi-dimensional metasurfaces holographic technologies

2020

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Holography has attracted tremendous interest due to its capability of storing both the amplitude and phase of light field and reproducing vivid three-dimensional scenes. However, the large pixel size, low resolution, small field-of-view (FOV) and limited space-bandwidth of traditional spatial light modulator (SLM) devices restrict the possibility of improving the quality of reconstructed images. With the development of nanofabrication technologies, metasurfaces have shown great potential in manipulating the amplitude, phase, polarization, frequency or simultaneously multiple parameters of output light in ultrashort distance with subwavelength resolution by tailoring the scattering behaviour of consisted nanostructures. Such flexibilities make metasurface a promising candidate for holographic related applications. Here, we review recent progresses in the field of metasurface holography. From the perspective of the fundamental properties of light, we classify the metasurface holography into several categories such as phase-only holography, amplitude-only holography, complex amplitude holography and so on. Then, we introduce the corresponding working principles and design strategies. Meanwhile, some emerging types of metasurface holography such as tunable holography, nonlinear holography, Janus (or directional related) and bilayer metasurfaces holography are also discussed. At last, we make our outlook on metasurface holography and discuss the challenges we may face in the future.

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Section: Janus and Bilayer Metasurfaces Holographymentioning

confidence: 99%

Recent advances in multi-dimensional metasurfaces holographic technologies

2020

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“…[43][44][45][46][47][48] Besides, the direction-controlled metasurfaces can also be regarded as a kind of full-space metasurface, which have the asymmetric transmission properties. [49,50] Compared to the halfspace (transmission or reflection mode) metasurfaces, the fullspace (both transmission and reflection modes) metasurfaces have advantages in usage of space resources. However, all previously reported full-space metasurfaces, no matter in transmission space or reflection space, can only deal with a single polarization, and do not have capacity to independently manipulate different polarizations in both transmission and reflection spaces at the same time.…”

Section: Transmission-reflection Controls and Polarization Controls Omentioning

confidence: 99%

Transmission‐Reflection Controls and Polarization Controls of Electromagnetic Holograms by a Reconfigurable Anisotropic Digital Coding Metasurface

Feng

et al. 2020

Advanced Optical Materials

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Digital coding metasurface, which provides a new approach to link the physical world and information science, has been quickly developed in recent years. However, all previously reported metasurfaces cannot achieve independent controls of different polarizations in both transmission and reflection spaces at the same time. In this work, a reconfigurable anisotropic digital coding metasurface loaded with electronically controlled PIN diodes is proposed that can independently manipulate not only the near/far‐field pattern but also the transmission and reflection modes of the electromagnetic waves under different polarizations. As a validation example, a multifunctional holographic imaging metasurface is designed, fabricated, and measured. Both simulated and measured results show that orthogonally polarized waves (vertical and horizontal polarizations) can be manipulated to achieve different images, and the transmission and reflection modes of the differently‐polarized images can be independently controlled in real time by changing the state of the loaded PIN diodes.

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“…Latterly, the Janus metasurfaces with different front and back transmissions have been realized to achieve the dynamic holographic images in the visible spectral and microwave regions. [ 26,61 ] Different from the existing literatures, in this work, we propose a new type of metasurface, self‐feeding Janus metasurface (SFJ‐MS) for manipulating incident EM waves and emitting EM waves to free space, which is similar to the god Janus with two respective faces, looking to the past and the future, in the Roman mythology. A sandwich‐shaped Janus microstructure is employed as basic element of SFJ‐MS, which is composed of a single layer substrate with thickness of 4 mm (1/15 λ , λ is the wavelength at 5 GHz), a diagonal‐split square ring, a rectangular patch with rotation, and a metal ground with self‐feeding microstructure.…”

Section: Introductionmentioning

confidence: 99%

A Thin Self‐Feeding Janus Metasurface for Manipulating Incident Waves and Emitting Radiation Waves Simultaneously

et al. 2020

Annalen der Physik

104

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A thin metasurface has shown powerful capabilities in controlling either incident electromagnetic (EM) waves or radiation waves, but is difficult for both. Here, a self-feeding Janus metasurface (SFJ-MS) is proposed to manipulate the incident EM waves and emit the radiated waves simultaneously, which can realize the polarization conversion of incident waves, scattering control, EM wave radiation, and radiation-beam steering. On the upper of SFJ-MS, a diagonal-split square ring and a rectangular patch with rotation for radiation are designed to introduce anisotropy in the meta-atom for converting the polarization of incident EM waves. On the bottom of SFJ-MS, a self-feeding microstructure converts the alternating current into the excitation of SFJ-MS to emit the EM waves to free space. The multiple functions of SFJ-MS are comprehensively substantiated by measured results, which are in agreements with the stringent simulations. This SFJ-MS, with lightweight, compact, low profile, and power-efficient features, can find potential applications in phased array radar systems, wireless communication systems, polarimetric radar imaging systems, and target detection systems.

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Directional Janus Metasurface

Cited by 211 publications

References 65 publications

Recent advances in multi-dimensional metasurfaces holographic technologies

Recent advances in multi-dimensional metasurfaces holographic technologies

Transmission‐Reflection Controls and Polarization Controls of Electromagnetic Holograms by a Reconfigurable Anisotropic Digital Coding Metasurface

A Thin Self‐Feeding Janus Metasurface for Manipulating Incident Waves and Emitting Radiation Waves Simultaneously

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