Switchable terahertz broadband absorption and linear-to-circular polarization conversion

Cheng, Jie; Li, Jiusheng

doi:10.1080/09500340.2022.2025937

Cited by 14 publications

(6 citation statements)

References 30 publications

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“…Compared with the device in reference [31], the EMD designed our work can realize not only CPC, but also LTC PC, and has more working bands. Compared with the work in reference [35], the EMD designed by us has more working bands and wider operating bandwidth in both absorption and PC. In addition, the operating frequency and efficiency can be tuned by tuning the Fermi level of graphene.…”

Section: Comparison With Previous Resultsmentioning

confidence: 84%

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Terahertz Multi-Band Absorber and Dual-Bandwidth Polarization Converter Based on Vo2 and Graphene

Jia,

Wang,

Zhang

et al. 2023

Preprint

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Section: Comparison With Previous Resultsmentioning

confidence: 84%

“…, the dielectric constant of SiO2 is set as 3.9 without considering losses. For graphene, single-layer graphene model data in FDTD software was used, and by using a random phase approximation, the surface conductivity of 2D graphene can be calculated by the following formula [18,[34][35]…”

mentioning

confidence: 99%

Terahertz Multi-Band Absorber and Dual-Bandwidth Polarization Converter Based on Vo2 and Graphene

Jia,

Wang,

Zhang

et al. 2023

Preprint

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“…In recent * Author to whom any correspondence should be addressed. years, various types of polarization converters based on metasurface have emerged, which can convert different polarization states of EM waves, such as cross-polarization conversion (CPC) [17,18], linear polarization (LP) to circular polarization (CP) conversion (LTC) [19][20][21], and lefthanded to right-handed circular polarization conversion [22,23], etc. Despite the development of metasurface in the EM field over the years, the main problem remains that most polarization converters still perform only a single operation or the relative bandwidth of multiband polarization converters is very narrow.…”

Section: Introductionmentioning

confidence: 99%

A multiband and multifunctional metasurface polarization converter using split-ring resonators

Liu,

Lu,

Chen

et al. 2023

J. Opt.

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In this paper, a multiband and multifunctional metasurface polarization converter is proposed based on split-ring resonators (SRR), which can effectively convert linearly polarized (LP) wave to cross-polarized and circularly polarized (CP) wave in the part of C to K bands. The simulation results show that when the structure has a metal bottom plate, the cross-polarization conversion (CPC) can be achieved in three frequency bands, 7.43-10.49, 10.84-14.66, 16.32-18.19GHz, the polarization conversion ratio (PCR) >90%, and the conversion from LP-to-CP (LTC) can be achieved in five frequency bands of 7.27-7.4, 14.72-14.9, 15.24-16.05, 18.24-18.79 and 18.97-19.47GHz, the axial ratio (AR) is less than 3dB, and the polarization converter can maintain good performances in 45° incidence angle. When there is no bottom metal plate, the LTC function can be achieved in two frequency bands, 8.32-9.72 and 11.24-17.18GHz, the AR is less than 3dB, and with the increase of the incident angle, the first frequency band of the LTC conversion is almost unchanged, but the second frequency band is split into two bands and then stabilized. The mechanism of polarization conversion generation was analyzed, and the polarization converter can be widely used in microwave communication and radar stealth fields.

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“…Generally, conventional metasurfaces have been usually designed for a single functionality. Recently, reconfigurable metasurfaces (RMSs) have been proposed that exhibit diversified functionalities together into one single device including bi-functionalities of linear polarization conversion (LPC) and circular polarization conversion (CPC) 15 – 20 , absorption (ABS) and reflection 5 , 21 – 24 , ABS and polarization conversion (PC) 25 – 38 . To achieve reconfigurable multifunctional metasurfaces, some approaches have been proposed such as mechanical shape-changing 31 , 39 and integrating with lumped elements 5 , 28 – 30 , 40 .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, metasurfaces that facilitate the effective integration of multiple functionalities into one structure have become an emerging research area, especially interesting for the terahertz (THz) range 41 . More recently, the incorporation of standard metasurfaces with phase-change materials (PCMs), such as Chalcogenide GeSbTe(GST) alloys 42 , Vanadium dioxide (VO ) 23 , 33 – 38 and graphene 18 , 20 , 26 , 27 , 43 have been proposed to realize the multifunctional metasurfaces. However, compared with PCM materials, graphene based method is still required high cost and sophistication for the manufacturing process.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable broadband metasurfaces with nearly perfect absorption and high efficiency polarization conversion in THz range

Nguyen

et al. 2022

Sci Rep

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Reconfigurable metasurfaces (RMSs) that enable the switching function of absorption and polarization conversion have attracted increasing attention. However, the design of RMSs to achieve wideband and high efficiency for both absorption and polarization conversion functions simultaneously remains a great challenge. Here, we propose the design of a RMS structure with a high-efficiency cross-polarization conversion and nearly perfect absorption. The reconfiguration between different functions of polarization conversion and absorption is obtained based on the reversible insulator-to-metal phase transition of Vanadium dioxide (VO$$_{2}$$ 2 ). When the VO$$_{2}$$ 2 is in insulator state, the RMS realizes the cross-polarization conversion function in the wideband of 1.04–3.75 THz with a relative bandwidth up to 113 $$\%$$ % due to the multi-resonant modes of electric and magnetic resonances. Meanwhile, the nearly-perfect absorption is achieved in the range of 1.36–3.38 THz with the corresponding relative bandwidth up to 85 $$\%$$ % for the VO$$_{2}$$ 2 in metallic state. Specially, the wideband and high-efficiency performance of these functionalities is maintained for a wide angle incidence. The capability of bi-functional switch and integration with polarization conversion and absorption in a single metasurface structure endowed with both wideband and high-efficiency characteristics for a wide incident angle is very promising for emerging RMS devices in the terahertz region.

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Switchable terahertz broadband absorption and linear-to-circular polarization conversion

Cited by 14 publications

References 30 publications

Terahertz Multi-Band Absorber and Dual-Bandwidth Polarization Converter Based on Vo2 and Graphene

Terahertz Multi-Band Absorber and Dual-Bandwidth Polarization Converter Based on Vo2 and Graphene

A multiband and multifunctional metasurface polarization converter using split-ring resonators

Reconfigurable broadband metasurfaces with nearly perfect absorption and high efficiency polarization conversion in THz range

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