  In the diffraction of visible light by a dielectric microcylinder packages of
evanescent waves always arise. However, a single-wave incidence corresponds to
rather small impact of evanescent waves outside the cylinder. In this paper, we
theoretically show that a symmetric pair of plane waves impinging a glass
microcylinder corresponds to much higher impact of the evanescent waves.
Namely, the interference of the evanescent waves with the propagating ones
results in the suppression of the electromagnetic field in an area with very
small cross section. This area is located in free space at a substantial
distance from the {rear side of the microcylinder and along its axis}. It may
serve a linear optical trap for cold atoms and ions.
