Manipulating linearly polarized electromagnetic waves using the asymmetric transmission effect of planar chiral metamaterials

Abstract

In this work, a kind of bilayered chiral metamaterial with double-T-shape combined structure is proposed to exhibit dual-band asymmetric transmission (AT) of linear polarization when the electromagnetic waves propagate forward and backward. Simulated and measured results demonstrate that the proposed metamaterial can rigorously satisfy the AT theorem. The cross-polarized conversion for the measurement reaches a maximum of 95%. In addition, a conspicuous broadband AT effect with the bandwidth of 2.32 GHz can be obtained by simply adjusting the thickness of the dielectric layer. Such a bilayered approach and adjustable property can be generalized to a wide variety of meta-dielectric metamaterial geometries, and the proposed metamaterial can effectually manipulate the linearly polarized electromagnetic waves.

Triple-band asymmetric transmission of linear polarization with deformed S-shape bilayer chiral metamaterial

“…Up to now, a great deal of efforts have been made to achieve the AT effect for EM waves [12][13][14][15][16][17][18]. Although, in previous excellent works, the AT effect of linearly polarized waves based on connected I-shape resonators [10], combined chirality and EM wave tunneling [16], double T-shape copper lines [17], as well as the AT effect for circularly polarized waves via side-by-side split quadrate rings [18] have been reported, achieving the AT effect to manipulate EM waves with simple structure, high efficiency and broadband operation is still highly desirable [10,17].…”

“…Further simulations show that this structure can manipulate EM waves at lower or higher frequencies simply by changing the size of the unit cells. This property provides us a way to adjust the metamaterial and indicates its wide applications in manipulating EM waves, ultrafast information processing, optical interconnections [17,19] and sensors.…”

Complementary Y-shaped chiral metamaterial with giant optical activity and circular dichroism simultaneously for terahertz waves

“…Thus, these antisymmetric currents function as coupled magnetic dipoles instead of electric dipoles. The strong magnetic dipole resonances in this x-y plane can be formed by the excitation of the antisymmetric current mode due to the stronger couping effect between the electric and magnetic fields (33,49,50). The induced magnetic fields excited by antiparallel surface current pairs are marked as H 1 , H 2 and H 3 (colour arrows) as shown in Figure 6(a) and (b).…”

Dual-band polarization angle independent 90° polarization rotator using chiral metamaterial

“…2(a), the measured jT yx j and jT xx j were −0.65 dB and −33.83 dB at 11.11 GHz, and the jT yx j and jT xx j were −0.924 dB and −45.58 dB at 15.22 GHz. To obtain a full understand of the optical activity of our structure and its ability to create cross-polarization transmission, one must analyze the transmission results for circularly polarized waves [17]. These data can be directly calculated from the linearly polarized transmission results [18] according to the following equation:…”