Characteristics of high-contrast gratings based spoof surface plasmon polaritons and the application in microwave all-dielectric metamaterial absorbers

Abstract

High-contrast gratings (HCGs) based spoof surface plasmon polaritons (SSPPs), as a new kind of SSPPs, have been proposed recently. Here, we study their particular mechanism and characteristics by comparing them with traditional metal-type SSPPs. The different fundamental dielectric resonator modes decided by the height–length ratio R of the dielectric element are found to be the key factor of the mechanism, leading to new characteristics and providing more working modes. In low R mode, HCG-based SSPPs can work under deep-subwavelength thickness and can be easily excited by free space wave and, thus, are considered to be applied to all-dielectric metamaterial absorbers (ADMMAs). Simulations and analysis confirm the microwave absorption effect of HCG-based SSPPs as a new mechanism of ADMMAs. Based on this, a carbon black based ADMMA is designed and the simulation and experimental results verify the important role of HCG-based SSPPs in broadband absorption. It is expected that this work can give rise to further and wider studies on the characteristics and applications of HCG-based SSPPs.

Establishing a unified paradigm of microwave absorption inspired by the merging of traditional microwave absorbing materials and metamaterials

“…5(b), the mode electric field exhibits a half vortex within the element, indicating the supported HCGs-based SSPPs are in low R mode. 47 The match between the distributions under normal incidence and the mode electric field distributions confirms the successful excitation of HCGs-based SSPPs. Additionally, Fig.…”

“…In the middle-frequency range, we're focusing on a novel type of dielectric SSPPs called high-contrast gratings (HCGs) based SSPPs, 47,63,64 which has become a new mechanism for alldielectric MMAs. To effectively harness HCGs-based SSPPs, the FSMA must behave similarly to an HCG.…”

“…[38][39][40][41][42][43][44] Incorporating traditional MAMs into nonmetal-based metamaterial design has yielded significant results. Notably, carbon-based [45][46][47][48][49] and magnetic materials [50][51][52][53][54][55][56][57][58] have been ingeniously employed as fundamental building blocks for nonmetal-based MMAs, showcasing exceptional broadband performances.…”

Lossy dielectric resonator array absorber made of multiwalled carbon nanotubes/epoxy composite

“…By contrast, three-dimensional metamaterials based on dielectric materials have the advantage of low weight. Dielectrics commonly used in metamaterials include carbon-based composites [8][9][10][11][12][13], honeycomb [14], low-loss microwave ceramics [15], and water [16]. Lightweight carbon-based composites benefit from higher dielectric losses, making metamaterial structures easier to achieve low profile and broadband absorption.…”

Broadband carbon-based all-dielectric metamaterial absorber enhanced by high-contrast gratings based spoof surface plasmon polaritons

“…Earlier this year, unique characteristics of high-contrast gratings based spoof surface plasmon polaritons (HCG-based SSPPs) have been investigated [33][34][35] and proved to be a new mechanism of ADMMAs due to their ability of propagating along the interface with highly confined EM fields [35]. However, the structure there is just a standard 2D HCG so that it can be investigated by both analytical and simulation analysis.…”