Multi-band transmissions of chiral metamaterials based on Fabry-Perot like resonators

Abstract

In this paper, a multi-layered metallic structure is proposed, which consists of split-ring resonators on both sides of two dielectric substrates. Numerical results reveal that the structure realizes a high magnitude of 0.94, three bands and broadband (more than 8 GHz) asymmetric transmission for linearly polarized wave. These properties are not observed in previous works. In order to better know these transmission properties, the Fabry-Perot like resonance model has been introduced to analyze the enhancement mechanism of asymmetric transmission in the multi-layered structure. The physical mechanism of linearly polarized wave conversion and asymmetric transmission based on electric fields and currents distribution is also analyzed in detail, respectively.

Ultrabroadband Design for Linear Polarization Conversion and Asymmetric Transmission Crossing X- and K- Band

“…In contrast to co-polarization transmission, the cross-polarization transmission coefficient t uv is extremely different from t vu at the considered frequencies. These above two conditions ensure the presence of AT effect for LP waves 33 34 35 36 37 38 39 40 41 42 43 44 47 48 . Most interestedly, there are two separated passbands observed, demonstrating strong optical activity in the proposed MM, one for v -to- u polarization conversion and the other for u -to- v polarization conversion.…”

“…Liu et al . 47 48 proposed a multi-layered metallic structure, which can achieve a high magnitude of 0.94 and broadband AT effect for LP waves. In 2016, a cavity-based linear converter was showed by Wang et al .…”

“…Meanwhile, a three-layered sandwiched MM was proposed to achieve broadband AT effect in the near-infrared communication band 50 . The physical mechanisms of the polarization conversion and AT effect can be explicated by Lorentz-theory approach and Fabry-Perot like resonance model 3 47 48 51 52 . Thus, these intriguing features therefore make it possible to give us some new idea to design high magnitude and broadband converter.…”

Asymmetric transmission of both linearly and circularly polarized waves in multi-layered meta-surface

“…However, the maximum AT coefficients of 0.56 and 0.30 for linearly and circularly polarized waves are still low. Very recently, the multi-layered chiral structures which can realize high amplitude of AT based on Fabry-Perot like resonators have been demonstrated in detail [8,9]. Therefore, adopting the similarly physical mechanism, it is still desirable and achievable to further improve the AT values of both linearly and circularly polarized waves.…”

Tailoring enhanced chiroptical effect with Fabry–Perot cavity-coupled sandwich chiral metamaterials

“…Additionally, active chiral plasmonics have attracted a considerable amount of interest due to their tunability of the chiroptical effect and the potential applications in highly integrated polarization sensitive devices [20] . Much new research about tailoring the electromagnetic response with FP cavity-coupled SCMs have been published in recent years [21][22][23] , while the reports about tailoring the chirality are rare. Indeed, the transmission and reflection efficiencies of SCMs can be periodically manipulated by changing the cavity length, which can be understood by far-field coupling [16] .…”