  We propose a perfect photonic router based on a specially designed chiral
bi-metasurface membrane for spin-polarized point light sources. Due to the
mirror symmetry breaking in the chiral metamembrane, the radiation power flux
of the clockwise and counterclockwise spinning dipoles to the opposite sides of
the slab becomes different. We show that spinning dipoles in the specially
designed chiral D$_4$-symmetrical bi-metasurface membrane can emit light either
upwards or downwards depending on their rotation direction. We attribute this
phenomenon to the Fano-resonance effect which is a result of the guided modes
coupling with the far field. We show the advantage of D$_4$-symmetrical
structures for the achievement of 100\% routing efficiency. This phenomenon can
find applications in spintronics for spin-selective inter-chip coupling or as a
measurement tool of spin polarization in memory cells.
