Abstract:Metamaterials with near-zero refractive index designed using fishnet structures are proposed. The near-zero-index band is generated with the overlap of electric and magnetic resonances, where the transition from a negative-n region to a positive-n region is found. Both the permittivity and the permeability are controlled via geometrical parameters and the structure orientation, and are near-zero within the operating band, resulting in low loss transmission. As the number of layers increases, the transmission b… Show more
“…Moreover, ZIM / A / ZIM refers to the system for which the aperture is symmetrically covered by the metamaterial. Considering the normal plane wave incident on the structure, we extract the effective parameters of the metamaterial using the well-known retrieval method 25, 26, 33, 34 , as illustrated in panels (e) and (f) of Fig. 1.Figure 1( a ) and ( b ) show, respectively, top and bottom perspectives of each unit cell of the considered metamaterial with dissimilar metasurfaces.…”
Section: Resultsmentioning
confidence: 99%
“…Furthermore, it has been proven that, by using a multilayered metal-dielectric fishnet metamaterial 25 or a structure composed of multiple layers of dissimilar metasurfaces 26 , it is possible to achieve low-loss ZIMs in a broad-band region.…”
We numerically validate and experimentally realize considerable funneling of electromagnetic energy through a subwavelength aperture that is covered with an epsilon-near-zero metamaterial (ENZ). The epsilon-near-zero metamaterial is composed of two layers of metasurfaces and operates at microwave frequencies. We demonstrate that the presence of the metamaterial at the inner and outer sides of the aperture not only lead to a significant enhancement in light transmission, but also cause a directional emission of light extracting from this hybrid system. In addition to these experimental results, we theoretically demonstrate the same concept in mid-IR region for a subwavelength gold aperture with indium tin oxide as an epsilon-near-zero material. Moreover, we found that using a dielectric spacer in-between the sunwavelength aperture and the ENZ medium, it is possible to red-shift the enhancement/directional frequency of the system.
“…Moreover, ZIM / A / ZIM refers to the system for which the aperture is symmetrically covered by the metamaterial. Considering the normal plane wave incident on the structure, we extract the effective parameters of the metamaterial using the well-known retrieval method 25, 26, 33, 34 , as illustrated in panels (e) and (f) of Fig. 1.Figure 1( a ) and ( b ) show, respectively, top and bottom perspectives of each unit cell of the considered metamaterial with dissimilar metasurfaces.…”
Section: Resultsmentioning
confidence: 99%
“…Furthermore, it has been proven that, by using a multilayered metal-dielectric fishnet metamaterial 25 or a structure composed of multiple layers of dissimilar metasurfaces 26 , it is possible to achieve low-loss ZIMs in a broad-band region.…”
We numerically validate and experimentally realize considerable funneling of electromagnetic energy through a subwavelength aperture that is covered with an epsilon-near-zero metamaterial (ENZ). The epsilon-near-zero metamaterial is composed of two layers of metasurfaces and operates at microwave frequencies. We demonstrate that the presence of the metamaterial at the inner and outer sides of the aperture not only lead to a significant enhancement in light transmission, but also cause a directional emission of light extracting from this hybrid system. In addition to these experimental results, we theoretically demonstrate the same concept in mid-IR region for a subwavelength gold aperture with indium tin oxide as an epsilon-near-zero material. Moreover, we found that using a dielectric spacer in-between the sunwavelength aperture and the ENZ medium, it is possible to red-shift the enhancement/directional frequency of the system.
“…4-circular double SRRs with different dimensions have been designed for multi-bands in order to optimize the permittivity characterization [1]. Hence, different MTM structure types, for instance, negative refraction index (NRI) MTMs [42][43][44]52], chiral MTMs [4,[45][46][47], and near-zeroindex (NZI) MTMs [48,49], can be additional choices, where more parameters can be manipulated.…”
Simple, compact and high sensitivity metamaterial-inspired microfluid sensors are developed to detect and classify dielectric fluids in the X-band regime using reflection coefficients. Multinegative refractive index band metamaterial structure is specifically designed as a sensing enhancer, where the multi-negative bands can effectively trigger the electromagnetic properties, as well as enhance the differentiation between the testing samples. The geometry of the metamaterial enhancer and its arrangement with the microfluidic channel and radiating patch antenna are optimized to reach the highest sensitivity of the samples' depiction. The proposed sensors were tested on ethanol traces, where sets of complex permittivity were varied. Distinguishable frequency responses generated from different samples at four resonances specify the capability of classifying the fluid concentration.
“…INTRODUCTION Metamaterials are a type of new artificial electromagnetic material. These include left-handed materials [1][2], zero-refraction materials [3][4][5], single-negative materials, right/left-hand transmission lines, and photonic crystals, among others. These artificial materials are not present in nature.…”
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