Large positive and negative lateral shifts near pseudo-Brewster dip on reflection from a chiral metamaterial slab

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.

Transmission of Gaussian beam through a coated chiral cylinder

“…(1) and (2) According to the radiation condition of an outgoing wave, an appropriate expansion of the scattered fields in terms of the CVWFs can be given by 2 . The constitutive relations for a chiral medium can be written as [15] ε ε κ μ ε = +i D E H (10)…”

Reflection and transmission of Gaussian beam by a chiral slab

“…By using an angular spectrum of plane waves to represent the incident field, the refraction at a dielectric-chiral interface of near fields of a constant current line source has been examined by Lakhtakia et al [6], and of a two-dimensional (2D) Gaussian beam by Hoppe et al [7]. Adopting the same angular spectrum representation approach, Huang et al discussed the lateral shifts from a slab of lossy chiral metamaterial illuminated by a 2D Gaussian beam [8]. The light pressure exerted on a chiral sphere by a Gaussian beam has also recently been studied [9].…”

“…for the same model as in Fig.4 for the same model as in Fig.2 0  , which is known as the lateral shift associated with an incident shaped beam [8].…”

3-D Gaussian beam scattering from a gyromagnetic perforated layer: Quasi-static approach

“…Greatly enhanced positive and negative lateral shifts are observable at a metal-air interface as the surface plasmon field can have a large amplitude [13]. Large lateral shift near the Brewster dip was discovered in reflection from a weakly absorbing medium [14] and from a chiral metamaterial slab [15]. It can be positive and negative that depends on the direction of the incident wave propagation or the applied magnetic field [16].…”