Switchable ultra-broadband terahertz wave absorption with VO2-based metasurface

Mou, Nanli; Tang, Bing; Li, Jingzhou; Dong, Hongxing; Zhang, Long

doi:10.1038/s41598-022-04772-4

Cited by 49 publications

(24 citation statements)

References 54 publications

(32 reference statements)

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“…The relative permittivity of VO material is described by Drude model 47 – 49 : with epsilon infinity and the collision frequency rad/s 45 , 48 , 49 . The plasma frequency can be given by: where S/m and rad/s.…”

Section: Structure Design and Methodsmentioning

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: Structure Design and Methodsmentioning

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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“…For example, Vanadium dioxide (VO2) can be transformed from insulator to conductor by increasing the temperature; GST materials, which are composed of germanium (Ge), antimony (Sb), and tellurium (Te), can be heated and cooled to transfer between disordered amorphous states and the ordered crystal state. VO2 [ 106 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 , 140 , 141 , 142 , 143 , 144 , 145 , 146 , 147 , 148 , 149 ] and GST [ 105 , 150 , 151 , 152 , 153 , 154 , 155 , 156 , 157 , 158 , 159 , 160 , 161 , 162 , 163 ] provides abundant reconfiguration mechanisms for reconfigurable metasurfaces.…”

Section: Materials Technologymentioning

confidence: 99%

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

et al. 2023

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Metasurfaces have shown their great capability to manipulate electromagnetic waves. As a new concept, reconfigurable metasurfaces attract researchers’ attention. There are many kinds of reconfigurable components, devices and materials that can be loaded on metasurfaces. When cooperating with reconfigurable structures, dynamic control of the responses of metasurfaces are realized under external excitations, offering new opportunities to manipulate electromagnetic waves dynamically. This review introduces some common methods to design reconfigurable metasurfaces classified by the techniques they use, such as special materials, semiconductor components and mechanical devices. Specifically, this review provides a comparison among all the methods mentioned and discusses their pros and cons. Finally, based on the unsolved problems in the designs and applications, the challenges and possible developments in the future are discussed.

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“…The VO 2 -based FP resonator can be classified into two groups according to the structures, that is, non-photonic-structure FP resonator [139,182,185] and photonic-structure FP resonator. [20,186,187] The non-photonic-structure FP resonator strictly followed the classical trilayer structure. For instance, Taylor et al [139] fabricated an asymmetric FP emitter, which was a trilayer structure consisting of VO 2 , an infrared transparent layer (Si), and an aluminum substrate.…”

Section: Vanadium Dioxidementioning

confidence: 99%

“…The VO 2 ‐based FP resonator can be classified into two groups according to the structures, that is, non‐photonic‐structure FP resonator [ 139,182,185 ] and photonic‐structure FP resonator. [ 20,186,187 ] The non‐photonic‐structure FP resonator strictly followed the classical trilayer structure. For instance, Taylor et al.…”

Section: Materials With Multi‐category Radiation Modulationmentioning

confidence: 99%

Solar and Thermal Radiation‐Modulation Materials for Building Applications

Chai

Fan

2022

Advanced Energy Materials

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the building envelope, which mainly consists of transparent and opaque components. For transparent components (e.g., window), the STRMMs should have high transparency of visible light (0.38-0.76 µm) under both hot and cold ambient conditions to guarantee natural lighting. Nearinfrared (NIR) light (0.77-2.5 µm), which accounts for 52% of solar heat, [9] should be reflected in summer for cooling purpose but be transmitted into room in winter to induce solar heat gains. For opaque components (e.g., wall), the STRMMs should have high reflectance of both visible and NIR lights in summer but low reflectance of both lights in winter. Meanwhile, as both transparent and opaque components continuously emit thermal radiation into the outdoor ambient, the STRMMs should have low infrared thermal emissivity in winter to suppress radiative heat loss but high infrared thermal emissivity in summer to accelerate radiative heat dissipation. Figure 1b shows the ideal optical properties of STRMMs applied on transparent and opaque components in both heating and cooling modes. Existing reviews mainly focused on the daytime radiative cooling materials with fixed solar reflectance and thermal emissivity, [10][11][12] which only helps reduce building cooling loads in summer but inevitably increases building heating loads in winter, leading to limited building energy savings. Recently, owing to the rapid development of material science, the STRMMs have been widely explored, which can dynamically modulate the optical properties under external triggers (e.g., thermo and electrical) to accommodate the heating/cooling needs of building in different seasons, showing improved building energy-saving potentials. [13][14][15][16][17] Although there are reviews reporting the materials with modulating optical properties, [15,18] they merely focused on either solar or thermal radiation modulation, which provide limited or even negative building energy savings, which may mislead the researchers to design low energy-efficient materials in practice. For instance, the thermochromic (TC) window can achieve low solar transmittance in hot season but high solar transmittance in cold season. [13,19] Nonetheless, it maintains high thermal emissivity (above 90%) in both seasons. This would accelerate heat loss of building in cold season, and result in limited energy savings. The vanadium dioxide (VO 2 )-based Fabry-Perot (FP) resonator can achieve low thermal emissivity in cold season but high thermal emissivity in hot season, while it maintains constant solar absorptance (25%) in both seasons. This would induce much more solar heating than the conventional cooling materials with smaller solar absorptance (10%), resulting in Regulation of solar and thermal radiation of building envelope shows huge energy-saving potentials. Existing reviews mainly focus on the materials with fixed solar and thermal optical properties. Although there are reviews reporting the materials with modulated optical properties (e.g., radiative cooling materials with modulating thermal emi...

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Switchable ultra-broadband terahertz wave absorption with VO2-based metasurface

Cited by 49 publications

References 54 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

Recent Advances in Reconfigurable Metasurfaces: Principle and Applications

Solar and Thermal Radiation‐Modulation Materials for Building Applications

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