Electric Field Of Incident Wave Research Articles

Magnetic excitation of high-Q resonance with split-ring resonators

Planar split-ring resonators (SRRs) with broken symmetry, excited by the electric field of incident wave, have been widely used to realize the high-Q resonance. In this paper, we report by theory and experiment an alternative scheme to induce the SRR-based high-Q resonance. The proposed scheme utilizes a two-dimensional array of vertical SRRs with vertical air gaps, which enables the excitation of narrow resonance with magnetic field and strong enhancement of local electromagnetic fields. The working mechanism correlates with the strong directional dependence of the dipole radiation (i.e., the elimination of electric-dipole radiation of the SRRs in the propagation direction), rather than the destructive interference due to the structural symmetry breaking. The dependence of Q factor on the structural parameters has also been studied theoretically, suggesting that a Q factor more than 2000 can be achieved. The results may be useful for designing narrow-band filters and sensors in the microwave or THz regime.

On the generalized Brewster's law for a moving dielectric medium

The Brewster-angle phenomenon for a dielectric half-space moving uniformly parallel to its surface is investigated. A general case is treated in which the polarization of the incident wave and the orientation of the plane of incidence with respect to the velocity vector are arbitrary. The generalized Brewster's law is derived which defines the angle of incidence as well as the required polarization for the electric field of incident wave in order to experience total transmission at the interface. It is shown that in general there are two unequal Brewster angles which are located on the opposite sides of the surface normal. However, when the velocity exceeds a certain value, these two angles occur in the same quadrant. The required polarization is linear, and it is in general not parallel to the plane of incidence.