The Effect of Rotational Disorder on the Microwave Transmission of Checkerboard Metal Square Arrays

Abstract

The effect of rotational disorder on the microwave transmission through thin metallic checkerboard arrays has been experimentally studied. Broad resonant features below the onset of diffraction, attributed to electromagnetic radiation coupling through the structure via the evanescent fields of bound surface waves, are found to be strongly dependent on the electrical connectivity of the surface. By applying rotational disorder to the elements comprising the arrays, with the lattice constant and element size unchanged, the electrical connectivity of the structure can be controlled whilst maintaining periodicity. The results show that rotational disorder can significantly affect transmission only when it changes the structure’s connectivity. When the initial structure is just above the connectivity threshold (where the metallic occupancy is 50%), increasing disorder causes the resonant features in transmission to invert as the structure switches from a predominantly connected array to a disconnected array. When approximately half of the connections are broken, the resonant features are suppressed, with scattering loss shown to dramatically increase to as much as 40% of the incident power over a broad frequency range. The result is a thin, highly effective scatterer of microwaves.

Compensation of disorder for extraordinary optical transmission effect in nanopore arrays fabricated by nanosphere photolithography

“…Both numerical simulations in [33] and experimental measurements in [25] showcase a lowering and flattening of transmission through thin gold films when the disorder increases. Along with perforations placement disorder, the rotational disorder [34] and nanopores size deviations [31] have also been considered.…”

Geometric Structure behind Duality and Manifestation of Self-Duality from Electrical Circuits to Metamaterials

“…The frequency-independent response has been experimentally observed in the terahertz frequency region [38]. In addition, introducing randomness into the connectivity of the metallic patches also leads to the similar flat spectrum [42,48]. In this random case, loss A results from mode conversion due to the randomness of the metasurface structure.…”

“…Over the past few decades, duality has been assuming an important role in the research and development of metamaterials. To name a few such cases, duality has been leveraged to design complementary metasurfaces [32][33][34][35], self-complementary metasurfaces [36][37][38][39][40][41][42], critical metasurfaces [43][44][45][46][47][48][49][50][51][52], maximally chiral metamaterials [53], and self-dual metamaterials with zero backscattering [54] or helicity conservation [55][56][57]. In such situations, the extensive target frequencies of metamaterials require a comprehensive understanding of duality in a unified manner.…”

Anisotropic Babinet-Invertible Metasurfaces to Realize Transmission-Reflection Switching for Orthogonal Polarizations of Light

“…The checkerboard metasurface has also been characterized in the optical region [13]. The critical property of checkerboard metasurfaces has been applied to reconfigurable transmission lines [14,15] and recently the critical behavior caused by rotational disorder has also been investigated [16].…”