Hyperuniform disordered distribution metasurface for scattering reduction

Abstract

Metasurfaces with spatially varying reflection phases have promised great possibilities in realizing diffusion-like backward scattering. However, most studies in the field of metasurface reflectors focus on the diffusion generated by a phase gradient from unit cells in periodic grids. In this paper, we propose a general idea of integrating the concept of a hyperuniform disordered structure to realize a metasurface, where the effect of the spatial distribution is taken into account to realize more diffusion. A V-shaped structure is utilized as the unit cell for the metasurface to realize two kinds of elements with a phase difference of 180°. The metasurface is generated by distributing the unit cells according to a hyperuniform disordered distribution, and we compared its performance with a metasurface comprised of the same unit cells, distributed on a fixed periodic lattice. Both simulation and experimental results demonstrate that the metasurface with the hyperuniform disorder performs better than the periodic metasurface by enlarging the operating bandwidth with a significant reduction in the radar cross section of the surface. When the frequency operating frequency increases, only one reflected beam is observed for the metasurfaces based on hyperuniform disordered distribution, which is in contrast to the periodic metasurface where several multiple reflected beams are observed.

SUTD-PRCM Dataset and Neural Architecture Search Approach for Complex Metasurface Design

“…Due to the interaction between an electromagnetic (EM) wave and metasurfaces in some specific geometrical arrangements, metasurfaces can exhibit remarkable electromagnetic wave responses that have attracted great interests [1][2][3][4]. Metasurfaces have served as an important technology in many applications such as heat transforming [5], cloaking [6,7], hologram [8], conversion [9], absorption [10,11], scattering reduction [12], polarization [13][14][15], transmission [16], color [17,18], metalense [14,15], programmable metasurfaces [19][20][21], and many others [22][23][24][25]. These applications are made possible by the rapid advancement in micro-and even nano-fabrication technologies and computational modeling over the past decades.…”

Local Order Metrics for Two-Phase Media Across Length Scales

“…The large-R behavior of σ 2 V (R) is at the heart of the hyperuniformity concept. Hyperuniform two-phase media are characterized by an anomalous suppression of volume-fraction fluctuations relative to garden-variety disordered media [16,17] and can be endowed with novel properties [21,22,23,17,24,25,26,13,27,28,29,30,31,32,33,34,35]. Specifically, a hyperuniform two-phase system is one in which σ 2 V (R) decays faster than R −d in the large-R regime [16,17], i.e., lim…”

Dynamic Measure of Hyperuniformity and Nonhyperuniformity in Heterogeneous Media via the Diffusion Spreadability

“…Hyperuniformity is an emerging field, playing vital roles in a number of fundamental and applied contexts, including glass formation [19,20], jamming [21][22][23][24][25], rigidity [26,27], bandgap structures [28][29][30], biology [31,32], localization of waves and excitations [33][34][35], self-organization [36][37][38], fluid dynamics [39,40], quantum systems [41][42][43][44][45], random matrices [43,46,47] and pure mathematics [48][49][50][51][52]. Because disordered hyperuniform two-phase media are states of matter that lie between a crystal and a typical liquid, they can be endowed with novel properties [12,18,[53][54][55][56][57][58][59][60][61][62][63]…”