Magnetic resonance hybridization and optical activity of microwaves in a chiral metamaterial

Abstract

The propagation of microwaves through a chiral metamaterial based on a magnetic dimer is experimentally studied. As proposed by our previous theoretical model, two resonance peaks are obtained in the transmission spectrum; these originate from the hybridization effect of magnetic resonance modes in this system. Optical activity is also observed in the transmission wave. The polarization state dramatically changes around the resonance frequency: the transmitted wave becomes elliptically polarized with its major polarization axis approximately perpendicular to that of the linear incident wave. This coupled magnetic dimer system provides a practical method to optically design tunable active medium and device.

A transparent 90° polarization rotator by combining chirality and electromagnetic wave tunneling

“…However, some drawbacks of these structures can be briefly listed as interference effects between the incident and reflected waves 5 and the polarization angle dependent response. [6][7][8] Afterwards, several other structures overcoming these drawbacks have been proposed in the literature. [9][10][11][12] However, these designs are not transparent to the incident waves such that they cannot transmit the incident field with unit transmittance.…”

Complementary chiral metamaterials with giant optical activity and negative refractive index

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] A CMM lacks any mirror symmetry so that the crosscoupling between the electric and magnetic fields exists at the resonance. The degeneracy of the two circularly polarized waves is thereby broken, i.e., the refractive indices of right circularly polarized ͑RCP, +͒ waves and left circularly polarized ͑LCP, Ϫ͒ waves have different values.…”

Hybridization effect in coupled metamaterials

“…it is straightforward to obtain the magnetic plasmon eigenfrequencies, This result has already been experimentally proven in the microwave range [39]. The radiation property of such two coupled SRR was also investigated [40] and it found the radiation loss was greatly suppressed at the lower frequency bonding mode and was enhanced at the higher frequency antibonding mode.…”

“…In addition to in identical resonators, hybrid modes were found in coupled structures composed of different resonators, including SRR pairs [43], cut-wire pairs [44], tri-rods [45,46], and nanosandwiches in defective photonic crystals [47]. These hybrid modes could lead to some new interesting and useful properties, such as optical activity [38,39] and omni-directional broadband negative refraction [45].…”