Efficiently Controlling near-Field Wavefronts via Designer Metasurfaces

Pan, Wenfeng; Wang, Zhuo; Chen, Yizhen; Zheng, Xiaoying; Li, Shiqing; Tian, Xinzhang; He, Qiong; Zhou, Lei; Sun, Shulin

doi:10.1021/acsphotonics.2c02009

Cited by 9 publications

(2 citation statements)

References 50 publications

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“…By exploiting the Metal-Insulator-Metal (MIM) structure or all-dielectric structures, researchers have successfully achieved directed radiation from guided-waves to free space and the resultant offchip focusing and holographic projection. [32,[43][44][45] However, the above method can normally realize the phase modulation under single-port and single-polarization excitation. Subsequently, TE mode excitations from orthogonal directions have been reported to multiply the port-controlled multiplexing dimension of integrated holographic metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

On‐Chip Integrated Metasurface Empowered Multi‐Channel Multiplexed Three‐Dimensional Hologram

Zhao,

Ha,

Guo

et al. 2024

Advanced Optical Materials

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On‐chip metasurfaces integrated atop optical waveguides have demonstrated the capability of efficiently radiating guided‐waves into arbitrarily prescribed spatial modes by properly tailoring the phase distribution in the metasurface interface. To date, most on‐chip holographic metasurfaces, typically relying on path multiplexing or wavelength multiplexing to multiply the produced images, encounter certain limitations in further enhancing the image storage capacity due to the limited degrees of freedom available for on‐chip devices. This work introduces an on‐chip metasurface composed of polarization‐sensitive cross meta‐atoms allowing independent control of the propagation phase of diffracted waves from waveguided TE and TM modes. Meanwhile, incorporating the guided‐wave generated in‐plane detour phases into the metasurface yields another two degrees of freedom. Thus, four independent holographic images can be readily switched by simply selecting the excitation modes and waveguide ports. As a proof‐of‐concept, a dual‐port four‐channel multiplexed metasurface, whose optical functionalities are validated by performing full‐wave simulations, is successfully realized. Moreover, the application to the creation of 3D holograms is also extended. Thus, the presented method provides a new approach for multifunctional multiplexing of on‐chip metasurfaces, which could hold great potential for applications in next‐generation wearable AR devices, 3D vision, multifunctional micro‐photonic integrated circuits, etc.

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Section: Introductionmentioning

confidence: 99%

On‐Chip Integrated Metasurface Empowered Multi‐Channel Multiplexed Three‐Dimensional Hologram

Zhao,

Ha,

Guo

et al. 2024

Advanced Optical Materials

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“…Such instruments result in typical optical systems facing bulky and expensive problems, hindering device miniaturization and system integration [2]. Metasurfaces assembled from a single layer of subwavelength meta-atoms can arbitrarily control the multi-dimensional properties of EM waves [3][4][5][6][7][8], including * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

All-dielectric terahertz metasurfaces for arbitrary linear polarization detection

Xu,

Li,

et al. 2023

J. Opt.

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The polarization state, an intrinsic property of electromagnetic (EM) waves, plays a key role in determining the mechanism of light-matter interactions. Recently, the bulky elements for evaluating polarization states have been miniaturized by using metasurfaces. However, determining arbitrary linear polarization states from vortex beams (VBs) generated by metasurfaces is quite challenging. Here, a general design of all-silicon quasi-periodic arrays based on polarization multiplexing technology is proposed, which can be used for the detection of arbitrary incident linear polarization (LP) state. By embedding independent helical phase profiles in two orthogonal LP channels, the generated interference spot at the predesigned focal plane is resolvable in a proper polarized direction. Benefitting from the establishment of a parametric theoretical model, the evolution of the incident polarization can be determined using key parameters defined on the pixelated focal plane. The proposed method can flexibly determine the polarization state of incident terahertz (THz) waves, which has great potential in remote sensing, high-resolution imaging, and data communication.

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Anti−Reflection Metamaterials with Phase Gradient Index Generate Surface Waves for Radar Stealth in the Microwave Regime

Huang,

Zhao,

et al. 2024

Adv Materials Technologies

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Although the conversion of propagating waves into surface waves is anticipated to introduce a novel degree of freedom for radar stealth materials, the manipulation of wavelength and traveling direction of surface waves at small phase gradients remains unclear. Here the aforementioned conversion is demonstrated utilizing a metamaterial composed of carbonyl iron powders, where the momentum mismatch is compensated by the material and the phase gradient index of the aligned meta−atoms. Surface waves are generated in the direction of the phase gradient within a phase span of 180°. The metamaterials with 5−level metastructure (5x:1x) generate surface waves with two wavelengths, and get the ξ/k0 value (ratio of the phase gradient index to the wave vectors of propagating wave) of 7.5 and 4.32, respectively. Furthermore, the dual phase gradient metastructure possesses the capability to alter the trajectory of the leaky microwave, converting it into a waveform resembling that of a vortex, while simultaneously preserving the integrity of surface waves. The sample achieves an effective absorption bandwidth of 5.67–7.96 and 20.19–21.10 GHz with an optimal absorption peak of −40.77 dB at 6.87 GHz. Present study develops a novel mechanism to improve the radar stealth properties of microwave absorption materials.

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Efficiently Controlling near-Field Wavefronts via Designer Metasurfaces

Cited by 9 publications

References 50 publications

On‐Chip Integrated Metasurface Empowered Multi‐Channel Multiplexed Three‐Dimensional Hologram

On‐Chip Integrated Metasurface Empowered Multi‐Channel Multiplexed Three‐Dimensional Hologram

All-dielectric terahertz metasurfaces for arbitrary linear polarization detection

Anti−Reflection Metamaterials with Phase Gradient Index Generate Surface Waves for Radar Stealth in the Microwave Regime

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