Abstract
In this work a composed chiral metamaterial structure constituted by the combination of a composite chiral metamaterial and a modified fishnet structure is presented and numerically analyzed. This new fishnet-like chiral metamaterial features two wide frequency bands wherein the refractive indices are negative and exhibits lower losses than its constituents do.
Highlights
Chiral metamaterials (CMM) provide an alternative route to negative refraction [1]
A way of partially decreasing these losses is provided by using composite CMMs (CCMM) [2]
The fishnet-like chiral metamaterial (FCMM) structure has been characterized by means of the
Summary
Chiral metamaterials (CMM) provide an alternative route to negative refraction [1]. Thanks to their chirality parameter, CMMs can exhibit negative refractive index, n±, for the right(+) or left-handed (−) circularly polarized eigenwaves. With the aim of going a step further on the losses reduction, an enhanced evolution of the aforementioned mentioned structure is presented in this communication This new design, called fishnet-like chiral metamaterial (FCMM), displays C4 symmetry and combines the CCMM of [3] with a low losses fishnet arrangement [4]-[5]. This novel combination improves the response of [3] by providing negative refractive indices for each eigenwave along two wider frequency bands (0.8 and 0.9 GHz) and a higher FoM, greater than 50 in the 60% of each frequency band
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