Thermally reconfigurable Fano resonance in water brick pair metamaterial

Xu, Jing; Fu, Quanhong; Fan, Yuancheng; Nan, Jiameng; Zhang, Fuli

doi:10.1016/j.rinp.2021.104650

Cited by 8 publications

(2 citation statements)

References 49 publications

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“…The complex permittivity values of water ( ε liquid = 80, tan δ liquid = 0.025) are adopted from ref. [53]. The data was interpolated at 400 MHz from the curve figure.…”

Section: Methodsmentioning

confidence: 99%

Impacts of Liquid Level on Microwave Resonance Sensing with a Flexible Microfluidic Channel

Wang

Zhang

et al. 2023

Advanced Sensor Research

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Permittivity sensing based on resonance tracking lays the fundamental principle for a variety of biochemical sensors, which has found vast applications in cancer biomarker detection, antigen-antibody analysis, and so on. Driven by continuous promotion of the detection limit, precise environmental control highlights its critical importance. Here, the impacts of liquid level on microwave resonance sensing are investigated, in which a flexible polydimethylsiloxane microfluidic channel and soft tubing are employed to control the liquid under test. The hydraulic pressure affects the effective permittivity of the liquid and the channel material, hence causing extra resonance shift signals. Both contactless and contacting sensing scenarios are studied in numerical simulations and experiments. It is demonstrated that the resonance frequency varies sensitively with the liquid level, and a sensitivity of 343 kHz mm −1 is measured. Meanwhile, a spoof localized surface plasmon resonator and its optimized excitation structure are employed and analyzed for a good figure of merit, addressing the detectability difficulties for high-permittivity and high-loss aqueous solutions. These results provide general guidelines for understanding and controlling the resonance sensors in aqueous environments and help to realize further lower detection limits.

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“…The complex permittivity values of water ( ε liquid = 80, tan δ liquid = 0.025) are adopted from ref. [53]. The data was interpolated at 400 MHz from the curve figure.…”

Section: Methodsmentioning

confidence: 99%

Impacts of Liquid Level on Microwave Resonance Sensing with a Flexible Microfluidic Channel

Wang

Zhang

et al. 2023

Advanced Sensor Research

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show abstract

“…[32,33] The permittivity of water is dependent on temperature, enabling thermally configurable resonance responses. [34,35] Wideband perfect absorption has also been achieved based on the material loss of water, which can be flexibly adjusted by various water fillings. [36,37] By selecting the heights of water cylinders to acquire a 2π phase shift, water metasurfaces can be exploited in wavefront shaping like anomalous wave reflection.…”

mentioning

confidence: 99%

Tunable Water‐Based Meta‐Lens

Yao

Chen

Lin

et al. 2023

Advanced Optical Materials

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Water, the source of life, is a more abundant, low‐cost, and environment‐friendly candidate material for tunable meta‐devices compared to conventional approaches in the microwave region. Wavefront shaping can be flexibly manipulated by adjusting the shapes and temperature of water‐based meta‐atoms, but individual control of each meta‐atom is complicated and inconvenient, especially for continuous tunability. Here, we propose a design strategy based on the phase compensation mechanism to continuously tune the properties of water‐based meta‐lenses at 5 GHz. Integrated‐resonant units (IRUs) with coupled water pillars are carefully designed to effectively tailor the balance between polarization conversion efficiency and phase compensation. By changing the filling height of water in the designed meta‐lens from 10 to 60 mm, the focal length can be tuned from 228 to 424 mm. The off‐axis focusing of the meta‐lens is also demonstrated in which the deflection angle is adjustable from around 0° to 5°. This work will pave the way for designing tunable water‐based meta‐devices and facilitating their applications in microwave imaging systems.

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Recent progress in Fano-resonant terahertz metasurface and its application

Chen,

Gao,

Sun

et al. 2024

Discov Appl Sci

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The unique electromagnetic response characteristics of metasurfaces and their intrinsic physical mechanisms have attracted a lot of attention. With the help of metasurfaces, the amplitude, phase, polarization, and other information of light waves can be effectively modulated. Fano resonance with asymmetric and sharp line shape is sensitive to refractive index changes in the environment, it can be realized through the structure design of the metasurface. Terahertz wave is located between microwave and infrared waves and can be used in the fields of high-sensitivity detection, high-precision imaging, and wireless communication. Terahertz metasurface with sharp Fano resonance is promising in realizing highly sensitive detection of biological macromolecules, such as glioma cells and other substances, which has attracted more and more attention. Here we review the progress of passive or active terahertz metasurfaces with Fano resonances due to various operation mechanisms and their applications in sensitive sensing.

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Thermally reconfigurable Fano resonance in water brick pair metamaterial

Cited by 8 publications

References 49 publications

Impacts of Liquid Level on Microwave Resonance Sensing with a Flexible Microfluidic Channel

Impacts of Liquid Level on Microwave Resonance Sensing with a Flexible Microfluidic Channel

Tunable Water‐Based Meta‐Lens

Recent progress in Fano-resonant terahertz metasurface and its application

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