Abstract
In this paper, an ultrathin transparent metamaterial polarization transformer using a circular twist-split-ring resonator (TSRR) was proposed and investigated experimentally and numerically. The experimental and simulated results exhibit an asymmetric transmission only for forward and backward propagating linearly polarized waves. An incident linearly polarized wave can convert its polarization nearly completely to the cross direction after transmission under certain conditions. The simulated spatial evolution of the electric field further indicates that the twist structure functions as a perfect polarization transformer at certain frequencies.
Highlights
Electromagnetic (EM) metamaterials (MMs) have attracted enormous interest in recent decades due to their unique responses to EM radiation, which are generally not encountered in their natural forms [1, 2]
From the above analysis of experimental and simulated results of the MM polarization transformer for linearly polarized EM radiation, we find that the maximal value of the cross-polarization transmission txy is relatively small at resonance for backward propagation, which is mainly due to the dielectric loss of the FR-4 substrate
We first analyzed the design criterion for the AT effect of MMs, and demonstrated experimentally and numerically an AT phenomenon for linearly polarized EM waves only and an ultrathin linear polarization transformer based on a twist-split-ring resonator (TSRR)-structured MM with a thickness smaller than λ/26
Summary
Electromagnetic (EM) metamaterials (MMs) have attracted enormous interest in recent decades due to their unique responses to EM radiation, which are generally not encountered in their natural forms [1, 2]. The AT effect of circular or linear polarization has been studied for different MM structures, where the partial conversion of the incident EM wave is asymmetric for opposite propagation directions, which mainly originates from the interaction of EM radiation with the structural two-dimensional (2D) chirality in the MMs [23,24,25,26,27].
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