Switchable metasurface with double phase distributions for wavefront manipulation

Niu, Junhao; Li, Chunhui; Yao, Qianyu; Mo, Wei; Zhu, Aijun

doi:10.1088/1402-4896/ace665

Phys. Scr.

2023

DOI: 10.1088/1402-4896/ace665

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Switchable metasurface with double phase distributions for wavefront manipulation

Junhao Niu

Chunhui Li

Qianyu Yao

et al.

Abstract: We designed a switchable metasurface for wavefront manipulation by employing vanadium dioxide (VO2), which can convert the circular polarized wave to its cross-polarized wave. With the change of conductivity of VO2 at different temperatures, the metasurface can exhibit two different phase distributions at the same targeted frequency. The two phase distributions can be easily attained by rotating two rings of the unit elements. Next, based on the metasurface, we designed focal length switchable metalens and gen… Show more

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2024

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Cited by 5 publications

References 26 publications

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Switchable Pancharatnam–Berry Phases in Heterogeneously Integrated THz Metasurfaces

Dong,

Zhu,

Guo

et al. 2024

Advanced Materials

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The Pancharatnam–Berry (PB) phase has revolutionized the design of metasurfaces, offering a straightforward and robust method for controlling wavefronts of electromagnetic waves. However, traditional metasurfaces have fixed PB phases determined by the orientation of their individual elements. In this study, an innovative structural design and integration scheme is proposed that utilizes vanadium dioxide, a phase‐change material, to achieve thermally controlled dynamic PB phase control within the metasurface. By leveraging the material's properties, this can dynamically alter the optical orientation of individual elements of the metasurface and achieve temperature‐dependent local phase modulation based on the geometric phase principle. This approach, combined with advanced fabrication processing technology, paves the way for next‐generation dynamic devices with customizable functions.

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Switchable Pancharatnam–Berry Phases in Heterogeneously Integrated THz Metasurfaces

Dong,

Zhu,

Guo

et al. 2024

Advanced Materials

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Optically reconfigurable multi-channel orbital angular momentum generator based on 3-bit coding metasurface

Liang,

Dai

2024

AIP Advances

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In this paper, an optically reconfigurable coded metasurface based on photosensitive silicon material for generating multi-channel, multi-mode vortex beams in the terahertz band is proposed. The top layer of the proposed metasurface is a skeletonized metal ring with eight photosensitive silicon patches equidistantly filled in the middle; the bottom structure is a metal plate for reflecting electromagnetic waves. The coding process of the eight photosensitive silicon patches and the use of a spatially structured light source for aligned irradiation can realize the reflection phase reconstruction and form a 3-bit reconfigurable metasurface. Based on the principle of coded metasurface convolution and the principle of superposition, the phase distributions of 3-bit metasurface arrays for single-channel and multi-channel vortex beams are calculated. Under the excitation of a right circularly polarized plane wave, a vertically reflected +1 order vortex wave, a +2 order vortex wave reflected in the tilted direction, +2 and +3 order vortex waves in two directions, and vortex beams carrying orbital angular momentum of orders −2, +1, +2, and +3 in four different directions, respectively, are generated. Our work provides a new way to design a programmable and reconfigurable metasurface, and the designed novel optically controlled reconfigurable metasurface is potentially valuable in the fields of dynamic imaging, terahertz communication, and so on.

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Multi-functional terahertz metasurface for a vortex beam, multi-channel focusing, polarization conversion, and broadband absorption based on vanadium dioxide

Li,

Wei,

Yang

2024

Appl. Opt.

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Although terahertz metasurface devices have been widely studied, thus far, metasurfaces can rarely manipulate both circularly and linearly polarized incident waves. In this paper, taking advantage of the phase transition characteristics of vanadium dioxide (VO2), a multi-functional terahertz metasurface for a vortex beam, multi-channel focusing, polarization conversion, and broadband absorption is proposed. When VO2 is in the insulating state, a vortex beam is generated at 1.2 THz when the circularly polarized wave is incident on the metasurface. Meanwhile, the multi-channel focusing is realized at 1.0 THz, and the cross-polarization conversion rate can reach more than 90% at the frequencies of 0.6 THz, 1.1 THz, and 1.6 THz when the y-polarized wave is incident vertically. When VO2 is in the metallic state, the metasurface achieves close to 95% absorption in the range of 0.8–1.5 THz. The designed metasurface has tunability and multi-functional characteristics, which have potential applications in wireless communication.

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Switchable metasurface with double phase distributions for wavefront manipulation

Cited by 5 publications

References 26 publications

Switchable Pancharatnam–Berry Phases in Heterogeneously Integrated THz Metasurfaces

Switchable Pancharatnam–Berry Phases in Heterogeneously Integrated THz Metasurfaces

Optically reconfigurable multi-channel orbital angular momentum generator based on 3-bit coding metasurface

Multi-functional terahertz metasurface for a vortex beam, multi-channel focusing, polarization conversion, and broadband absorption based on vanadium dioxide

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