Switchable efficiency terahertz anomalous refraction and focusing based on graphene metasurface

Zhu, Xuzheng; Cheng, Yongzhi; Jiang, Fan; Chen, Fu; Luo, Hui; Wu, Ling

doi:10.1016/j.diamond.2021.108743

Cited by 85 publications

(29 citation statements)

References 56 publications

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“…When the incident light angle is large (30 ), the device maintains a practically constant reection intensity at an almost xed spectral position. 63,64 Because the grating unit of the device has 60 rotational symmetry, the device exhibits excellent insensitivity to polarization and tolerance to angles. Furthermore, it can be noticed that new modes appear in the TM mode when the incident light angle increases, while this does not occur in the TE mode.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

High-Qrefractive index sensors based on all-dielectric metasurfaces

Zeng

et al. 2022

RSC Adv.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

High-Qrefractive index sensors based on all-dielectric metasurfaces

Zeng

et al. 2022

RSC Adv.

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“…In general, the phase interference metasurface forms n bits coding elements by several structures with 2π/2 n phase difference. Moreover, the active, reconfigurable, and multifunctional coding metasurfaces have been designed while the PIN diodes or microelectromechanical systems are introduced in the unit cell of metasurfaces (Liu et al, 2016;Chen et al, 2017;Yuan et al, 2019;Zhao et al, 2019;Li et al, 2020b;Li et al, 2020c;Cheng et al, 2021b;Pan et al, 2021;Zhu et al, 2022). A transmissive metasurface which consists of periodic strip slits and rectangular C-slits etched on substrate integrated waveguide cavities has been designed in order to split a linearly polarized (LP) EM wave into two symmetrical CP beams.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Coding Metasurface With Left and Right Circularly Polarized and Multiple Beams

Han

et al. 2022

Front. Mater.

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In this paper, a multifunctional coding metasurface (MCMS) has been proposed to realize dual-circularly polarized beams and beam focusing with transmission and reflection. The phase of transmissive wave is controlled by rotating the elements, and the corresponding element, which consists of two quadrate voids etched on a single layer substrate, is designed for the metasurface with Pancharatnam-Berry (PB) phase. The phase distribution of the circularly polarized four-beam is determined according to the convolution theorem of patterns and the phase compensation principle. In order to validate the proposed metasurface, the multifunctional meta-device is fabricated and measured to illustrate the four-beam with left circular polarization in transmissive space and the right circularly polarized four-beam in reflective space by MCMS with x-polarized incidence. The experimental results heavily agree with the simulated data. The MCMS has potential applications in wireless communications due to its low profile, compact, and lightweight features.

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“…Multiple beam generation and multifocal lenses have been demonstrated numerically. [42,43] All of the above MSs can control the wavefront at different frequencies [44][45][46][47][48][49][50][51] but they can only operate well for LP or CP wave.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Transmission‐Type Metasurface for the Linear and Circular Polarization Wavefront Manipulation

Cheng

2022

Advcd Theory and Sims

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A transmission‐type metasurface (MS) based on the combined geometric and transmission phase is proposed and investigated here numerically, which can achieve independently manipulation of the circular polarization (CP) and linear polarization (LP) wavefront at terahertz (THz) region. The unit‐cell of the proposed MS is composed of the dielectric substrate sandwiched with the bilayered inner centrosymmetric‐notched‐elliptic (CNE), outer C‐shaped, and single‐split‐ring (SSR) structures. The proposed MS can convert the normal incident LP wave to its orthogonal one at the lower frequency (f1 = 0.68 THz) after transmission and left‐handed circular polarization to the transmitted right‐handed circular polarization wave or vice versa at the higher frequency (f2 = 1.34 THz). The full 2π phase shifts of the both transmitted LP and CP waves can be realized independently and simultaneously by varying the opening and orientation angles of the outer SSR structure based on the transmission phase and the orientation angle of the inner CNE structure based on geometric phase, respectively. As proofs of concept, anomalous refraction, planar focusing, and vortex beam generation for both LP and CP waves are demonstrated numerically. These findings show great potential applications in imaging and communication systems, providing new possibilities to develop multifunctional THz device for both LP and CP waves.

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Switchable efficiency terahertz anomalous refraction and focusing based on graphene metasurface

Cited by 85 publications

References 56 publications

High-Qrefractive index sensors based on all-dielectric metasurfaces

High-Qrefractive index sensors based on all-dielectric metasurfaces

Multifunctional Coding Metasurface With Left and Right Circularly Polarized and Multiple Beams

Terahertz Transmission‐Type Metasurface for the Linear and Circular Polarization Wavefront Manipulation

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