Generalized Terahertz Perfect Vortices with Transmutable Intensity Profiles Based on Spin‐Decoupled Geometric Metasurfaces

Sun, Baohong; Zang, Xiaofei; Lu, Binfeng; Chi, Haoxiang; Zhou, Yiwen; Zhu, Yiming; Zhuang, Songlin

doi:10.1002/adom.202301048

Cited by 3 publications

(1 citation statement)

References 50 publications

(48 reference statements)

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“…So far, metasurfaces have been widely adopted in many THz applications, such as THz beam deflectors [24], THz lenses [23,25,26], THz holograms [27,28], and TVB generators [29]. Among the reported metasurface-based TVB generators, geometric phase is widely used, achieving effective control of the carried OAM [7,30]. However, they are frequency independent and only sensitive to circularly polarized states, which to some extent limits the freedom of design and control, hindering the further application of TVBs.…”

Section: Introductionmentioning

confidence: 99%

Polarization and frequency multiplexed multi-channel focusing terahertz vortex with a birefringent dielectric metasurface

Ren,

Zhao,

Wang

et al. 2024

Phys. Scr.

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We propose an approach to generate polarization and frequency multiplexed focusing vortex beams using a birefringent dielectric metasurface in terahertz (THz) range. The designed metadevice consists of Si nanopillars with different sizes. The transmission efficiency of each unit cell under orthogonal polarized illumination can exceed 70% at both operating frequencies 1 THz and 1.2 THz. Combining the functions of beam deflection, focusing, and vortex beam generation in the interference holography design strategy, polarization and frequency multiplexed multi-channel focusing THz vortex beams with different topological charges and generation positions can be achieved, which can greatly improve the transmission capacity of THz communications. Combining its compact and efficient features with multiplexing methods, our designed metadevice has enormous potential for application in THz vortex generation and information processing.

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Section: Introductionmentioning

confidence: 99%

Polarization and frequency multiplexed multi-channel focusing terahertz vortex with a birefringent dielectric metasurface

Ren,

Zhao,

Wang

et al. 2024

Phys. Scr.

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Liquid Crystal Integrated Dynamic Terahertz Metalenses

Wang,

Ge,

et al. 2024

Laser & Photonics Reviews

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Metasurfaces can freely manipulate the wavefront of electromagnetic waves with the merits of minimization and integration. Dynamic metadevices have continued to be urgently pursued to realize on‐demand functionalities. Among them, dynamic metalenses have attracted particular attention due to their widespread applications, especially in the promising terahertz region. Here, a liquid crystal integrated terahertz metalens with dynamic focusing properties is proposed. Subwavelength silicon columns are specifically designed and set to realize the same lens phase profile for orthogonal linear polarizations, while the rotation of columns additionally introduces a spin‐selective conjugated geometric phase. A photopatterned liquid crystal layer is added to compensate for the geometric phase; therefore, a polarization‐independent single focus is achieved. With a saturated bias applied to the liquid crystal, the phase compensation vanishes; therefore, a spin‐selective bifocal function is realized. When lens and polarization grating profiles are encoded to the geometric phase separately, longitudinal and lateral spin‐dependent focus separations are demonstrated. The metalens can be electrically switched between single‐focus and bifocal functions. The dynamic metalens can be utilized in depth‐of‐field imaging and telecom port selection. The design endows various existing metadevices with dynamic functions.

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Metasurface-empowered high-efficiency and broadband terahertz vortex beam plates

Niu,

Chen,

Lang

et al. 2024

Applied Physics Letters

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Metasurfaces have been continuously garnering attention in both scientific and industrial fields owing to their unprecedented wavefront manipulation capabilities using arranged subwavelength artificial structures. Terahertz vortex beams have become a focus of research in recent years due to their prominent role in many cutting-edge applications. However, traditional terahertz vortex beam plates are often faced with challenges including large size, low efficiency, and limited working bandwidth. Here, we propose and experimentally demonstrate highly efficient and broadband vortex beam plates based on metasurface in the terahertz region. The experimental results well verify that the designed metasurfaces can efficiently generate terahertz vortex beams with different orbital angular momentum topological charges in the range of 0.5–1 THz. Notably, the maximum efficiency can reach about 65% at 0.5 THz. The proposed devices may play a vital role in developing vortex beams-related terahertz applications.

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Generalized Terahertz Perfect Vortices with Transmutable Intensity Profiles Based on Spin‐Decoupled Geometric Metasurfaces

Cited by 3 publications

References 50 publications

Polarization and frequency multiplexed multi-channel focusing terahertz vortex with a birefringent dielectric metasurface

Polarization and frequency multiplexed multi-channel focusing terahertz vortex with a birefringent dielectric metasurface

Liquid Crystal Integrated Dynamic Terahertz Metalenses

Metasurface-empowered high-efficiency and broadband terahertz vortex beam plates

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