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Multistage dispersion engineering in a three-dimensional plasmonic structure for outstanding broadband absorption

In this paper, a comprehensive scheme of plasmonic absorbing structure (PAS) based on multistage dispersion engineering is proposed which can effectively integrate more multiple adjacent resonances for outstanding low-frequency absorption enhancement. Our investigation shows that the multi-absorption peaks with the controllable intervals can be flexibly gained at the lower frequency by extending the bent wire to three-dimensional (3D) space. Based on this, PAS consisting of 3D bent wire arrays with gradually varied length is proposed which directly assembles the multiple adjacent absorptions via dispersion engineering of spoof surface plasmon polariton (SSPP). Then, with the spatial dispersion optimization, multi-bent wire arrays with deliberately regulated periods are combined again on the same plane which further fills up the discontinuity of the absorption spectrum. Simulation and experimental measurements show that our proposed combined 3D PAS can achieve broadband absorption with the efficiency more than 90% in the frequency band of 6.7-35.3GHz, contributing to a low figure of merit compared to others. Our proposal provides an efficient and flexible design capable of enhancing the operating bandwidth and absorbing efficiency simultaneously in PAS, enabling a wide range of applications.