Influence of the ratio between extinction coefficient and real component refractive index of materials to the spatial Goos-Hänchen shifts of incident light beams

Abstract

In this paper, we numerically calculate the spatial Goos-Hänchen shift of a laser beam impinging a material whose extinction coefficient is greatly smaller compared to its real refractive index. Materials with complex refractive indices allow an impinging beam to have both real and imaginary values of its Fresnel coefficients, which in turn give rise to both angular and spatial Goos-Hänchen shifts, respectively. This paper focuses on the influence of the ratio of the real and imaginary parts of the refractive indices of materials to the magnitude of spatial Goos-Hänchen shifts produced by light beams.