  We investigate the phenomenon of the transverse breaking of symmetry of
Gaussian lasers transmitted through dielectrics, showing for which incidence
conditions and beam parameters it can be observed in optical experiments. The
numerical analysis, done by using the integral form of the transmitted beam at
the lower interface of a dielectric prism, shows, for incidence approaching the
critical region, a laser planar trapping. By using an analytic approximation
for the intensity of lower transmitted beam, we model the wave front curvature
by a closed expression which depends on the refractive index, on the
geometrical properties of the dielectric block, and, finally, on the incidence
angle of the incoming beam. The analytic formula shows an excellent agreement
with the numerical analysis and it could be useful in future experimental
implementations.
