Abstract
The lateral shifts from a slab of lossy chiral metamaterial are predicted for both perpendicular and parallel components of the reflected field, when the transverse electric (TE)-polarized incident wave is applied. By introducing different chirality parameter, the lateral shifts can be large positive or negative near the pseudo-Brewster angle. It is found that the lateral shifts from the negative chiral slab are affected by the angle of incidence and the chirality parameter. In the presence of inevitable loss of the chiral slab, the enhanced lateral shifts will be decreased, and the pseudo-Brewster angle will disappear correspondingly. For the negative chiral slab with loss which is invisible for the right circularly polarized (RCP) wave, we find that the loss of the chiral slab will lead to the fluctuation of the lateral shift with respect to the thickness of the chiral slab.The validity of the stationary-phase analysis is demonstrated by numerical simulations of a Gaussian-shaped beam.
Highlights
The Goos-Hanchen (GH) effect [1] has been analyzed both theoretically [2,3,4] and experimentally [5,6,7]
We further find the lateral shifts will fluctuate with respect to the thickness of the slab when the angle of incidence is smaller than the critical angle of the LCP wave, while for θi ≥ θc, the lateral shifts will vary with the thickness monotonously
An investigation on the lateral shifts of both reflected parallel and perpendicular components for the lossy chiral metamaterial slab has been done by using the stationary-phase approach
Summary
The Goos-Hanchen (GH) effect [1] has been analyzed both theoretically [2,3,4] and experimentally [5,6,7]. At an oblique incidence, the lateral shifts were found to be large positive or negative for both reflected and transmitted beams in different media such as dielectric surfaces or slabs [9, 10], metal surfaces [11], dielectric-chiral surface [12,13,14,15], absorptive media [16,17,18], and so on. Since the realistic chiral material is dissipative, in this paper, we would like to investigate the lateral shift of the reflected beam from a chiral metamaterial slab with inherent loss. We demonstrate that these perpendicular and parallel polarized waves can, to the first order, be independently separated, each with its own lateral shifts. Throughout the paper, only transverse-electric (TE) polarized incident wave is discussed below, and the results for transverse-magnetic (TM) polarized wave can be obtained in the same way
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