Abstract
Precise control of a coupling effect is critical for space-limited communication system applications. Dielectric metamaterials, which derive their electromagnetic properties from subwavelength structures, have emerged as a promising way to tune coupling effect due to their complex resonant modes. However, it has not yet achieved quantitative control of coupling effects in metamaterial designs, which is important for advanced engineering applications such as artificial intelligence antenna and reconfigurable camouflage. In this paper, all dielectric left-handed metamaterial operating in THz band based on the deep coupling of higher mode Mie resonance is presented. Distinguished from those designs published before, this left-handed metamaterial is composed only by one same structure, not two separated parts providing negative permittivity and permeability, respectively. By utilizing different Mie resonant modes, negative permittivity and permeability are accomplished via high order Mie resonant modes and the coupling between cubes. This work opens a gate to highly control of electromagnetic wave in dielectric metamaterial by using the coupling between the unit cells.
Highlights
Manipulation on wavefront has always been an important issue in modern electromagnetic engineering technology [1]–[3]
Shrinking space will affect the mutual coupling between the electromagnetic devices [4]–[7]. This coupling effect will bring problems in two stages: the first stage is the couple between each component just affect the performance in bad ways and it needs to be eliminated; the second stage is the coupling effect can play a role in a range of performances, but needs to be under completely control
Deep coupling between each cubes are introduced to play an important role in regulating the higher Mie resonance mode, and by controlling the cube diameters and distance between each other, the first higher electric mode and magnetic mode are combined to achieve a left-handed metamaterial
Summary
Manipulation on wavefront has always been an important issue in modern electromagnetic engineering technology [1]–[3]. This study focuses on the internal principle of coupling effect and proposes the combination of Mie scattering theory and coupled mode theory to quantitatively describe the complex coupling effect in dielectric metamaterials at the resonant frequencies. We propose a novel method that combines coupled mode theory and Mie scattering theory to analyze the coupling effect in the dielectric structures. This idea is simple and intuitive because this method regards each resonance mode as a whole and analyzes the structure directly from the energy point of view. Deep coupling between each cubes are introduced to play an important role in regulating the higher Mie resonance mode, and by controlling the cube diameters and distance between each other, the first higher electric mode and magnetic mode are combined to achieve a left-handed metamaterial. Deep coupling effect can make the effective permittivity and permeability tuning more flexible, and improve the freedom of electromagnetic energy manipulation
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