Resistive plasmonic absorbing structures for stability enhancement of broadband absorption
doi: 10.37188/CO.EN-2023-0022
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摘要:
电阻型吸波结构具有优异的宽带电磁吸波性能，但电阻片方阻值对吸波结构宽带电磁吸波性能影响较大，且在样品制备过程中较难精确控制。本文通过在电阻型吸波结构表面加载周期性人工等离子结构，利用宽频带内激发的多重等离子谐振，实现高效宽带色散调控，进而获得电阻型吸波材料表面局域场增强效应，提升宽带电磁吸波的稳定性。仿真与试验结果表明，当电阻片方阻值在100~250 Ω/sq内变化时，该电阻型等离子吸波结构在7.8~40.0 GHz频段内的吸收效率高于90%以上，具有连续宽带电磁吸波能力。该设计方案提供了一种加载人工等离子结构用于强化吸波超材料综合性能的设计思路，对复合型吸波超材料设计具有一定的启发。
Abstract:Broadband absorption performance in resistive metamaterial absorbers (MA) has always been disturbed by its ohmic sheet element. We propose a comprehensive scheme based on integrating resistive MA and plasmonic structure (PS) to enhance the stable absorption performance. Theoretical investigation indicated that the PS can inspire multi-resonance based on dispersion engineering, and that the localized electric field takes effect on the surface of the ohmic sheet accordingly. Simulation and experimental measurement demonstrated that the proposed resistive plasmonic absorbing structures (PAS) can achieve stable and highly efficient absorption within the frequency band from 7.8 to 40.0 GHz with the ohmic sheet ranging from 100 to 250 Ω/sq. In conclusion, the proposed integration of PS and resistive MA provides an efficient pathway to optimize performance for various applications.
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Figure 1. (a) Schematic of no-planar resistive MA unit cell; (b) prospective view of no-planar resistive MA; (c) simulated absorption spectra of no-planar resistive MA under the normal incidence
Figure 2. (a) Schematic diagram and (b) dispersion relationship of the bent-wire-shaped structure
Figure 3. (a) Schematic diagram of bent-wire-shaped PS; (b) reflection and transmission spectra of bent-wire-shaped PS under the normal incidence; (c) absorption spectra of bent-wire-shaped PS
Figure 4. (a) Schematic diagram of resistive PAS unit cell; (b) prospective view of resistive PAS; (c) simulated absorption spectra of the proposed resistive PAS under the normal incidence
Figure 5. Electric field Ey distributions of (a) resistive PAS and (b) bent-wire-shaped PS in the y-z plane at the frequencies of 10.0, 15.0, 20.0, and 25.0 GHz
Figure 7. Simulated and measured absorption spectra of resistive PAS with an ohmic sheet (a) fz=100 Ω/sq and (b) fz=250 Ω/sq
Table 1. Cut-off frequencies of the bent-wire-shaped structure with different lengths
${\boldsymbol{l }}$ l=7.0 mm l=8.0 mm l=9.0 mm l=10.0 mm The first cut-off
frequency/GHz14.5 13.1 11.8 10.6 The second cut-off
frequency/GHz24.9 23.4 21.8 20.4 
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