Spatial structure of the refracted field of a Gaussian light beam at total internal reflection.

The two-dimensional spatial structure of a stationary monochromatic refracted field is studied theoretically for the case of its exciting in a transparent homogeneous medium by incidence of a Gaussian light beam under total internal reflection. For that, the exact solution of refracted field in the form of a Fourier integral is used. It is shown that this spatial structure exhibits properties characteristic of the fields in strongly inhomogeneous and absorbing media: field attenuation as it propagates deep into the medium, noticeable diffraction beam divergence near the boundary itself, non-rectilinear nature of propagation in the medium, and non-exponential attenuation along its depth.

Efficiency of Gaussian light beam transformation into a waveguide mode of a plane dielectric layer under frustrated total internal reflection.

On the basis of the 2D analytic theory of the phenomenon of frustrated total internal reflection for a Gaussian light beam, produced by the authors in the previous paper [J. Opt. Soc.