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.
We propose a subwavelength waveguide composed of two parallel nanorod chains. Based on the finite-difference time-domain analysis, we find that the electromagnetic energy can be highly confined in the gaps of nanorod pairs and transported in the gap waveguide through strong magnetic coupling interaction between neighboring nanorod pairs. In a structure with the rod length of 500 nm and the gap size of 100 nm, the energy flow cross section of the propagation mode can be restricted to the size of /33ϫ/ 16 at the frequency of 130.0 THz. The corresponding attenuation length of energy propagation reaches 7.2. Moreover, these propagation modes exhibit a broad continuous frequency band from zero up to a cutoff frequency c ϳ 162.6 THz.
We studied the propagation of an electromagnetic ͑EM͒ wave in a defective multilayer microcavity with an artificial magnetic atom located at the edge of the defect layer. When the frequency of the defect state is tuned to the resonance frequency of the magnetic atom, strong coupling happens between this atom and EM waves. It creates a type of magnetic plasmon polariton ͑MPP͒ with Rabi-type splitting effect that results in the two branches of the MPP mode. The linewidth of the MPP and Rabi-type oscillation of magnetic field inside the atom are investigated in the simulations. A great enhancement of local fields can also be obtained from the MPP, which has a good application in nonlinear optics.
A new kind of metamaterial, an array of periodic gold rod pairs standing on gold substrate, is introduced in this paper. A commercial electromagnetic mode solver, the High-Frequency Structure Simulator, is employed to explore the propagation property of electromagnetic waves in this system. When an S -polarized electromagnetic (EM) wave propagates along the substrate surface, strong magnetic resonance is produced in the far-infrared regime. Based on the simulated S parameters, effective refraction index is retrieved and negative value is obtained over the wavelength range from 49.2 microm to 66.7 microm. A wedge made of this metamaterial with an inclined angle 26.6 degrees is designed. An observable negative refraction behavior of EM wave is attained in this structure at wavelength 61.2 microm. The refractive index is calculated by Snell's law and it is consistent with the retrieved results quite well. This provides direct evidence for the negative refraction property.
Surface plasmon excitations and the associated optical transmission properties in perforated metal/dielectric/metal trilayer structures are numerically investigated. Pronounced magnetic modes are observed in the antisymmetric and asymmetric modes of surface plasmon polaritons (SPPs). The influence of substrates on the magnetic response is studied in detail. Quite different from the conventional LC-circuit resonance, these magnetic excitations arise from the nonlocalized SPPs in the perforated layered structure, which may considerably enrich the electromagnetic properties of such metamaterials, especially the artificial magnetism at optical frequency.
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