Switching between perfect absorption and polarization conversion, based on hybrid metamaterial in the GHz and THz bands

Ha, Duong Thi; Dzung, Dinh Ngoc; Ngọc, Nguyễn Văn; Tung, Bui Son; Pham, Thanh Son; Lee, YoungPak; Chen, Liang Yao; Khuyen, Bui Xuan; Lãm, Vũ Đình

doi:10.1088/1361-6463/abeb97

Cited by 17 publications

(8 citation statements)

References 52 publications

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“…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 . However, these approaches process some drawbacks such as the limitation of the working band and sophistication of the fabrication 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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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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“…In mu-negative material, only magnetic component is considered; therefore, it is also known as magnetic metamaterial (MM) [18]. Almost metamaterial structures operating at GHz and THz frequency ranges have both electric and magnetic responses [19,20]. However, MM usually operates at low MHz frequencies and works mainly with magnetic fields [21,22].…”

Section: Introductionmentioning

confidence: 99%

Enhanced transmission efficiency of magneto-inductive wave propagating in non-homogeneous 2-D magnetic metamaterial array

Le¹,

Pham²,

Khuyen³

et al. 2022

Phys. Scr.

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In this work, we investigate the propagation of magneto-inductive waves (MIWs) in ordering magnetic metamaterial (MM) structures. The proposed non-homogeneous MM slab consists of 9 × 9 MM unit cells constructed from a five-turn spiral embedded on an FR-4 substrate. External capacitors with the value of 40 pF or 50 pF were added to control the resonant frequency of each unit cell in accordance with the waveguide configurations. The characteristics of metamaterial structures, such as negative permeability, current ratio, transmission response, and field distribution in the waveguide, have been thoroughly analyzed by simulation and experiment. Because of the strong magnetic field confinement in the waveguide, the transmittance after nine elements of the non-homogeneous MM slab is 5.2 times greater than that of the homogeneous MM slab. This structure can be applied to the planar near-field wireless power transfer, position sensor, and low-frequency communication.

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“…They were proposed theoretically by Veselago in 1967 and first experimentally built in 2000 by Smith [ 17 , 18 ]. Metamaterials and metadevices can be applied in various new technology fields, such as active microwave camouflage, antennas, absorbers, acoustics, and biosensors [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Studies on the use of magnetic metamaterials (MMs) to enhance WPT efficiency have been intensively carried out over the past decade and continue to be active now [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Flexible Magnetic Metasurface with Defect Cavity for Wireless Power Transfer System

et al. 2022

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In this paper, we present a flexible magnetic metamaterial structure for enhancing the efficiency of wireless power transfer (WPT) systems operating at 13.56 MHz. The metasurface between transmitter (Tx) and receiver (Rx) coils of the WPT system is constructed of a 3 × 5 metamaterial unit cell array with a total size of 150 × 300 mm2. Most metamaterial structures integrated into WPT systems are in planar configurations with a rigid substrate, which limits practical applications. The proposed metasurface is fabricated on an FR-4 substrate with a thin thickness of 0.2 mm; therefore, it can be bent with radii greater than 80 mm. A defect cavity is formed in the non-homogeneous metasurface by controlling the resonant frequency of the unit cell with an external capacitor. Simulation and measurement results show that the efficiency of the WPT system is significantly enhanced with metasurfaces. The performance of the WPT system can also be optimized with suitable bend profiles of metasurfaces. This proposed flexible metasurface could be widely applied to WPT systems, especially asymmetric, bendable, or wearable WPT systems.

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Switching between perfect absorption and polarization conversion, based on hybrid metamaterial in the GHz and THz bands

Cited by 17 publications

References 52 publications

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

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

Enhanced transmission efficiency of magneto-inductive wave propagating in non-homogeneous 2-D magnetic metamaterial array

Flexible Magnetic Metasurface with Defect Cavity for Wireless Power Transfer System

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