Merging absorption bands of plasmonic structures via dispersion engineering

Abstract

In this paper, a comprehensive scheme based on the dispersion engineering of spoof surface plasmon polariton (SSPP) is proposed which attempts to merge absorption bands of plasmonic structure into a continuous one. Theoretical investigation shows that multi-resonance can be tailored in a meandered wire structure, and thus, the closed interval of adjacent absorption is achieved. Then, the plasmonic absorbing structure (PAS) consisting of a meandered wire array with the gradient length are employed here to achieve spatial k-dispersion engineering of SSPP, and the original isolated absorption bands are demonstrated to be merged into a continuous one. On such a basis, a hybrid PAS consisting of a meandered wire array and a straight wire array is proposed. Simulation and experimental measurements show that the proposed hybrid PAS can achieve ultra-wideband absorption with an efficiency of more than 90% in the frequency range of 5.0–31.6 GHz, which is 107.7% broader with respect to the original PAS of the straight wire array at the same thickness. Our strategy overcomes the contradiction between broadening absorption bandwidth and keeping high absorption efficiency in PAS, enabling a wide range of applications, such as radar stealth technology, electromagnetic compatibility, and so on.

Ultra‐broadband metamaterial absorbers based on spoof surface plasmon polaritons structure

“…The so‐called SSPP can be excited by artificial electromagnetic medium or structure in the microwave band 14,15 . With the deepening of researches, the characteristics of SSPP such as local field enhancement, strong dispersion and deep sub wavelength are widely applied in many vital technologies in microwave frequency 16–20 . For example, Reference 21 demonstrated the ability of the spatial k‐dispersion engineering to produce customized broadband absorption by means of SSPP.…”

“…14,15 With the deepening of researches, the characteristics of SSPP such as local field enhancement, strong dispersion and deep sub wavelength are widely applied in many vital technologies in microwave frequency. [16][17][18][19][20] For example, Reference 21 demonstrated the ability of the spatial k-dispersion engineering to produce customized broadband absorption by means of SSPP. Hence, benefited by its local field enhancement and frequency cut-off properties, SSPP has become a potential EM absorbing material.…”

Wideband Absorption at Low Microwave Frequencies Assisted by Magnetic Squeezing in Metamaterials

“…Therefore, one common purpose in this topic is to broaden the bandwidth of the MAs and improve the absorption level simultaneously [15][16][17][18]. Thus, a great many research attempts have been implemented, including stacking multiple resonances together in the vertical direction [19], loading with lumped resistors [20], and applying spoof surface plasmon polariton (SSPP) [21,22].…”

A Broadband Wide-Angle Synthetical Absorber Designed by Topology Optimization of Resistance Surface and Metal Wires

“…optimization design with polarization-insensitive was used by Sui to realize an ultra-broadband RFSS absorber [28], by which, the periodic structure, the dimension of the cell and the material parameters can be optimally designed simultaneously by intelligence algorithm such as genetic algorithm (GA) and particle swarm optimization (PSO) [29]- [32]. In the spatial k-dispersion engineering, meandered-wireshaped vertical MA was proposed by Shen, and different length of wires with different cut-off frequencies were coupled together to achieve the ultra-broadband absorption [33].…”