  We show how a superconducting region (S) sandwiched between two normal leads
(N), in the presence of barriers, can act as a lens for propagating electron
and hole waves by virtue of the so- called crossed Andreev reflection (CAR).
The CAR process which is equivalent to the Cooper pair splitting into the two N
electrodes provides a unique possibility of constructing entangled electrons in
solid state systems. When electrons are locally injected from an N lead, due to
the CAR and normal reflection of quasiparticles by the insulating barriers at
the interfaces, sequences of electron and hole focuses are established inside
another N electrode. This behavior originates from the change of momentum
during electron-hole conversion beside the successive normal reflections of
electrons and holes due to the barriers. The focusing phenomena studied here is
fundamentally different from the electron focusing in other systems like
graphene pn junctions. In particular due to the electron-hole symmetry of
superconducting state, the focusing of electrons and holes are robust against
thermal excitations. Furthermore the effect of superconducting layer width, the
injection point position, and barriers strength is investigated on the focusing
behavior of the junction. Very intriguingly, it is shown that by varying the
barriers strength, one can separately control the density of electrons or holes
at the focuses.
