  Transverse spin angular momentum (SAM) of light and associated transverse
chiral optical forces have received tremendous attention recently as the latter
may lead to an optical separation of chiral biomolecules. In this context, the
relative magnitude of chiral and non-chiral forces represents a challenge for
the implementation of chiral separation schemes. In this work we demonstrate
that, by spatially separating the maxima of transverse spin density from the
gradient of field intensity, it is possible to dominate chiral-specific
components of the force over non-chiral ones. To that end, we study optical
nanofibers and nanowires as a candidate for such scheme and demonstrate that in
their vicinity, chiral optical forces can emerge that are stronger than
gradient and scattering forces. This finding may be of significance in the
design of improved optical separation schemes for chiral biomolecules.
