All-dielectric terahertz metasurfaces with dual-functional polarization manipulation for orthogonal polarization states

Yue, Zhen Xing; Li, Jitao; Li, Jie; Zheng, Chenglong; Liu, Jingyu; Zou, Die; Xu, Hang; Yang, Fan; Li, Hui; Wu, Liang; Zhang, Yating; Zhang, Yan; Yao, Jianquan

doi:10.1039/d2nr06550a

Cited by 12 publications

(6 citation statements)

References 44 publications

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“…In order to verify the effect of the half-wave plate, we calculated the polarization conversion rate (PCR) of the structure, which can measure how much the polarization state of the reflected wave deviates from that of the incident wave. The formula for PCR is provided by [ 34 ]:

where

, and

are the reflection coefficients for different combinations of the incident and reflected polarization.…”

Section: Resultsmentioning

confidence: 99%

Achieving Photonic Spin Hall Effect, Spin-Selective Absorption, and Beam Deflection with a Vanadium Dioxide Metasurface

Zhao

Ding

et al. 2023

Materials

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Metasurface-based research with phase-change materials has been a prominent and rapidly developing research field that has drawn considerable attention in recent years. In this paper, we proposed a kind of tunable metasurface based on the simplest metal–insulator–metal structure, which can be realized by the mutual transformation of insulating and metallic states of vanadium dioxide (VO2) and can realize the functional switching of photonic spin Hall effect (PSHE), absorption and beam deflection at the same terahertz frequency. When VO2 is insulating, combined with the geometric phase, the metasurface can realize PSHE. A normal incident linear polarized wave will be split into two spin-polarized reflection beams traveling in two off-normal directions. When VO2 is in the metal state, the designed metasurface can be used as a wave absorber and a deflector, which will completely absorb LCP waves, while the reflected amplitude of RCP waves is 0.828 and deflects. Our design only consists of one layer of artificial structure with two materials and is easy to realize in the experiment compared with the metasurface of a multi-layer structure, which can provide new ideas for the research of tunable multifunctional metasurface.

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where

, and

are the reflection coefficients for different combinations of the incident and reflected polarization.…”

Section: Resultsmentioning

confidence: 99%

Achieving Photonic Spin Hall Effect, Spin-Selective Absorption, and Beam Deflection with a Vanadium Dioxide Metasurface

Zhao

Ding

et al. 2023

Materials

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show abstract

“…Subsequently, Li et al achieved the conversion from arbitrary to circular polarization in the terahertz (THz) band by the destructive and constructive interference behavior induced by the assembly of meta-atoms with different transverse dimensions into meta-molecules [28]. Although metasurface arrays assembled based on a diatomic interference mechanism are a promising paradigm, most of the reported facts achieve only a single type of polarization conversion behavior, weakening the scenarios for further applications of meta-wave plates [16,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Terahertz bi-functional polarization converter based on interference mechanism supported by diatomic metasurfaces

Li,

Xu,

et al. 2024

J. Opt.

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Polarization manipulation based on the Jones matrix facilitates the enhancement of light-matter interactions. Recently, arbitrarily tailorable polarization states generated with the assistance of a diatomic metasurface effectively reduce the complexity of the system. However, a single polarization switching behavior hinders the application of meta-platforms in cryptographic imaging. Here, we theoretically propose and design a single-layer diatomic all-dielectric metasurface working in the terahertz (THz) band, which can efficiently realize bi-functional polarization switching according to the Jones matrix. Such a meta-platform is assembled from two anisotropic silicon pillars with carefully optimized lateral dimensions and in-plane twist angles. Benefiting from the flexible assembly of half-wave plate (HWP) and quarter-wave plate (QWP), the polarization states generated by the constructed metasurfaces in the transmission mode can be arbitrarily tailored. The feasibility of this diatomic metasurface is further validated by a broadband near-field imaging device, paving the way for broader system applications in cryptographic imaging, data storage, and chiral sensing.

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“…The main purpose of this innovative method is to generate co-and crosspolarized circularly polarized (CP) light with different intensities and phases under CP light excitation. This method has already been successfully used to design multifunctional metadevices, including multichannel vortex light generators [29,30], dual-function waveplates [31], and multichannel polarization conversion devices [32][33][34]. Nonetheless, to the best of our knowledge, there have been no reports on the use of the aforementioned method for achieving intensity-controllable beam splitting and polarization conversion.…”

Section: Introductionmentioning

confidence: 99%

All-dielectric metasurfaces for intensity-controllable beam splitting and polarization conversion

Wang,

Zhang

et al. 2024

J. Phys. D: Appl. Phys.

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Beam splitters and polarization converters of electromagnetic waves based on metasurfaces have been extensively studied. However, there are few reports on the ability to arbitrarily control the intensity ratio between different diffraction orders while achieving beam splitting and polarization conversion. In this paper, we propose a method to achieve polarization conversion and beam splitting with varying intensities by manipulating the superposition of the output orthogonal circularly polarized (OCP) light. Specifically, polarized light with certain intensities and phase distributions in multiple channels can be decomposed into the superposition of OCP light with varying amplitudes and phases. Under the excitation of circularly polarized (CP) light, the amplitudes and phases of the output OCP light can be manipulated by adjusting the size and rotation angle of the nanopillar within the meta-atom. We show three metasurfaces capable of converting CP light into OCP and linearly polarized light in dual channels, with the ability to vary the intensity ratios of these polarized lights. Simulations demonstrate that the diffraction efficiencies of the desired diffraction orders of three metasurfaces exceed 90%. This method provides a novel concept for the design of multifunctional meta-devices.

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All-dielectric terahertz metasurfaces with dual-functional polarization manipulation for orthogonal polarization states

Abstract: All-dielectric metasurfaces have led to a surge of activities in the field of polarization converters due to their extremely significant potential in the manipulation of terahertz waves. Herein, a versatile...

Cited by 12 publications

References 44 publications

Achieving Photonic Spin Hall Effect, Spin-Selective Absorption, and Beam Deflection with a Vanadium Dioxide Metasurface

Achieving Photonic Spin Hall Effect, Spin-Selective Absorption, and Beam Deflection with a Vanadium Dioxide Metasurface

Terahertz bi-functional polarization converter based on interference mechanism supported by diatomic metasurfaces

All-dielectric metasurfaces for intensity-controllable beam splitting and polarization conversion

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