Papers › Optical chiral sorting forces and their manifestation in evanescent waves and nanofibres
Optical chiral sorting forces and their manifestation in evanescent waves and nanofibres
Sebastian Golat, Jack J. Kingsley-Smith, Iago Diez, Josep Martinez-Romeu, Alejandro Martínez, Francisco J. Rodríguez-Fortuño
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Optical fields can exert forces of chiral nature on molecules and nanoparticles, which would prove extremely valuable in the separation of enantiomers with pharmaceutical applications, yet it is inherently complex, and the varied frameworks used in the literature further complicate the theoretical understanding. This paper unifies existing approaches used to describe dipolar optical forces and introduces a new symmetry-based `force basis' consisting of twelve vector fields, each weighted by particle-specific coefficients, for a streamlined description of force patterns. The approach is rigorously applied to evanescent waves and dielectric nanofibres, yielding concise analytical expressions for optical forces. Through this, we identify optimal strategies for enantiomer separation, offering invaluable guidance for future experiments.
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