Chirality-Assisted Phase Metasurface for Circular Polarization Preservation and Independent Hologram Imaging in Microwave Region

Yuan, Yueyi; Wu, Qun; Burokur, Shah Nawaz; Zhang, Kuang

doi:10.1109/tmtt.2023.3256527

Cited by 62 publications

(16 citation statements)

References 38 publications

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“…Metasurfaces, a class of two-dimensional (2D) structured metamaterials with subwavelength meta-atoms forming spatially varying patterns, enable a high degree of freedom in controlling electromagnetic (EM) waves in ways that would not be possible with natural materials . By introducing an abrupt field discontinuity across the interface, metasurfaces have the remarkable ability to arbitrarily tailor the fundamental properties of the EM wavefront with a high spatial resolution, such as amplitude, phase, and polarization. − With these merits, metasurfaces have heralded a new era of flat optics to some extent and facilitate many intriguing practical applications, such as highly efficient meta-holograms, − high-numerical-aperture lenses, − well-defined generation of spin and orbital angular momentum (OAM) of light, − and novel meta-antennas. − …”

Section: Introductionmentioning

confidence: 99%

Direction-Duplex Janus Metasurface for Full-Space Electromagnetic Wave Manipulation and Holography

Yang

Chen

Dong

et al. 2023

ACS Appl. Mater. Interfaces

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Janus metasurfaces, a category of two-faced twodimensional (2D) materials, are emerging as a promising platform for designing multifunctional metasurfaces by exploring the intrinsic propagation direction (k-direction) of electromagnetic waves. Their out-of-plane asymmetry is utilized for achieving distinct functions selectively excited by choosing the propagation directions, providing an effective strategy to meet the growing demand for the integration of more functionalities into a single optoelectronic device. Here, we propose the concept of directionduplex Janus metasurface for full-space wave control yielding drastically different transmission and reflection wavefronts for the same polarized incidence with opposite k-directions. A series of Janus metasurface devices that enable asymmetric full-space wave manipulations, such as integrated metalens, beam generators, and fully direction-duplex meta-holography, are experimentally demonstrated. We envision the Janus metasurface platform proposed here to open new possibilities toward a broader exploration of creating sophisticated multifunctional meta-devices ranging from microwaves to optical systems.

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Section: Introductionmentioning

confidence: 99%

Direction-Duplex Janus Metasurface for Full-Space Electromagnetic Wave Manipulation and Holography

Yang

Chen

Dong

et al. 2023

ACS Appl. Mater. Interfaces

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“…Metasurfaces (MSs) have attracted considerable attention for physics and engineering applications because of their high degree of freedom in controlling electromagnetic (EM) waves. The capability of MSs to efficiently shape the wavefront of the EM wave has translated to its wide use in various fields. − With the increasing demand for miniaturized and highly integrated systems, a single MS with high efficiency and compact size is desirable for wavefront manipulation in wireless communication systems. A great deal of attention has been devoted to employing new techniques for designing MSs.…”

Section: Introductionmentioning

confidence: 99%

Controlling Radiation Beams by High-Efficiency Metasurfaces with Enhanced Refractive Index Elements

Bao,

Ren,

Liao

et al. 2023

ACS Appl. Mater. Interfaces

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The efficient manipulation of the electromagnetic wavefront using metasurfaces (MSs) has attracted a continuous amount of attention in recent years. MSs with arbitrarily controllable amplitude and phase are highly desirable in many emerging fields. However, in previous research, the resonance effect has mainly been used to accomplish the task. This article presents a nonresonant metamaterial element with stronger capacitive coupling. The broadband sandwich-structured meta-atom achieves an enhanced refractive index ranging from 2.44 to 8.90. By using the enhanced refractive index elements, the proposed transmissive MS has an ultrathin thickness (0.23 freespace wavelength). It consists of a specially designed gradient index MS placed on top of the transmitting antenna. The MS is designed to convert the spherical surface wave into a plane wave with high efficiency. One core layer (CL) gradient index MS and two impedance matching layers (IMLs) have been designed to transform the magnitude and phase of the radiation beam from the transmitting antenna. An efficient transmissive MS has been designed and experimentally evaluated with a maximum measured efficiency of over 85%. The proposed control strategy increases the design flexibility of the MS and shows great potential for broadband applications in the realization of efficient functional devices.

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“…Recently, metamaterials, [19][20][21][22][23][24][25][26] comprising of artificial assemblies of subwavelength periodic structure, have proven to be useful tools for the manipulation of EM waves. Especially the transparent metamaterial absorbers (MMAs), [27][28][29][30][31][32][33][34][35] have attracted significant attentions in the field of transparent EM shielding.…”

Section: Introductionmentioning

confidence: 99%

Highly Visible–NIR Transparent Metamaterial‐Window for Broadband Microwave Absorption and Shielding

Zhang,

Li,

et al. 2023

Adv Materials Technologies

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Optically transparent metamaterial absorbers have unexceptionally encountered a great challenge in further improving optical transparency ranging from visible (Vis) to near‐infrared (NIR) and environmental applicability, due to the limitations of constituent materials and multilayer structures. To overcome this limitation, a highly Vis‐NIR transparent metamaterial‐window with outstanding microwave broadband absorption and practical durability is proposed in this paper, which adopts a typical sandwich structure consisting of a cross‐ and cross‐ring‐shaped resonator and a reflective backplane, separated by a quartz glass. Experimental results indicate that the proposed metamaterial‐window achieves >80% absorptivity, covering a wide frequency range of 6.6–13.8 GHz with a relative bandwidth of 70.59%, while the measured shielding effectiveness is >16.94 dB, at 4.0–16.0 GHz. In addition, the corresponding physical mechanism is revealed by exploiting a classical multiple reflections interference model. More significantly, both the patterned resonator and backplane layers are formed by microscale gold meshes with high Vis‐NIR transmittance and environmental resistance, thereby enabling excellent salt spray corrosion resistance and high‐temperature stability, as well as an average optical transmittance of ≈87.35% at 400–1 800 nm. These advantages endow the design a promising candidate for addressing anti‐electromagnetic interference and electromagnetic shielding both in military and civilian.

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Chirality-Assisted Phase Metasurface for Circular Polarization Preservation and Independent Hologram Imaging in Microwave Region

Cited by 62 publications

References 38 publications

Direction-Duplex Janus Metasurface for Full-Space Electromagnetic Wave Manipulation and Holography

Direction-Duplex Janus Metasurface for Full-Space Electromagnetic Wave Manipulation and Holography

Controlling Radiation Beams by High-Efficiency Metasurfaces with Enhanced Refractive Index Elements

Highly Visible–NIR Transparent Metamaterial‐Window for Broadband Microwave Absorption and Shielding

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