Review Article: The weak interactive characteristic of resonance cells and broadband effect of metamaterials

Abstract

Articles you may be interested inEffects of inter-resonator coupling in split ring resonator loaded metamaterial transmission lines J. Appl. Phys. 115, 194903 (2014); 10.1063/1.4876444 Broadband subwavelength imaging using non-resonant metamaterials Appl. Phys. Lett. 104, 073502 (2014); 10.1063/1.4865897Dispersion effects in Fakir's bed of nails metamaterial waveguides Metamaterials are artificial media designed to control electromagnetic wave propagation. Due to resonance, most present-day metamaterials inevitably suffer from narrow bandwidth, extremely limiting their practical applications. On the basis of tailored properties, a metamaterial within which each distinct unit cell resonates at its inherent frequency and has almost no coupling effect with the other ones, termed as weak interaction system, can be formulated. The total response of a weak interaction system can be treated as an overlap of the single resonance spectrum of each type of different unit cells. This intriguing feature therefore makes it possible to accomplish multiband or broadband metamaterials in a simple way. By introducing defects into metamaterials to form a weak interaction system, multiband and broadband electromagnetic metamaterials have first been experimentally demonstrated by our group. The similar concept can also be readily extended to acoustic and seismic metamaterials. C 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

Visible Light Metasurfaces Assembled by Quasiperiodic Dendritic Cluster Sets

“…For the dendritic cluster set surface structure, having a certain height of transmission peak in a certain band means that the most probable distribution of the dendritic structure units is located in this band, that is, statistically, the distribution of N similar dendritic structures in the surface shows a quasiperiodic distribution, as demonstrated in Figure c. Although there is still a small number of dendritic structures that do not resonate in this band, the metamaterials show weak interactions between structural units compared with the strong interactions of solid structures, such as photonic and phononic crystals. Therefore, these dendritic structures that do not resonate in this band have a negligible influence on the optical response of the surface structure.…”

Inverse Doppler Effects in Broadband Acoustic Metamaterials

“…Therefore, the working frequency of the metamaterial can be modulated by changing the dimensions of the meta-molecule. The locally resonant essence35373839 of the present metamaterial ensures a non-significant influence among adjacent units30313233; therefore, a broadband double-negative metamaterial can be obtained by stacking meta-molecules with different working frequencies. Simulations and experiments have revealed the number and size of the units for this model.…”

Manipulation of visible-light polarization with dendritic cell-cluster metasurfaces

“…And with the concept of metasurface proposed in Science 15 , the authors use eight basic elements of the rod and V-shaped to achieve generalized Snell’s law. Relevant experiments and theories 12 , 39 , 40 show that the metamaterial is a weak interaction system, in which the interaction between the structural units is weak. And thus the interaction of the rod and V-shaped split ring structure in the dendritic metasurface is negligible.…”

“…Artificial design of different cell structures of metamaterials allowed them to acquire many characteristics that are nonexistent in nature; such characteristics include negative refraction, anomalous Cerenkov radiation, anomalous Doppler effect, perfect lens, super-resolution imaging, invisibility cloaking, and electromagnetic-wave polarization rotation 3 – 11 . These characteristics attract more and more researchers to study metamaterials, particularly those operating at microwave, infrared 12 , 13 , and visible light 14 wavelengths. As two-dimensional metamaterials, metasurfaces preserve characteristics of their three-dimensional counterparts in manipulating electromagnetic-wave behavior while reducing challenges in fabrication 15 .…”