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Optical fields can exert forces of chiral nature on molecules andnanoparticles, which would prove extremely valuable in the separation ofenantiomers with pharmaceutical applications, yet it is inherently complex, andthe varied frameworks used in the literature further complicate the theoreticalunderstanding. This paper unifies existing approaches used to describe dipolaroptical forces and introduces a new symmetry-based `force basis' consisting oftwelve vector fields, each weighted by particle-specific coefficients, for astreamlined description of force patterns. The approach is rigorously appliedto evanescent waves and dielectric nanofibres, yielding concise analyticalexpressions for optical forces. Through this, we identify optimal strategiesfor enantiomer separation, offering invaluable guidance for future experiments.

Optical chiral sorting forces and their manifestation in evanescent waves and nanofibres