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We investigate a force that has been predicted to discriminate molecules by their chirality when they are in the presence of an optical field with a polarization-helicity gradient. We investigate several experimental geometries for observing evidence of this force via enantiometer separation in racemic mixtures. We do this with singular-optical beams carrying a polarization helicity gradient across their transverse mode. Molecular diffusion and the dipole force – an intensity-gradient force – have so far precluded measurements of this force.
J. A. Jones,B. Regan,J. Painter,J. Mills,I. Dutta,B. Khajavi, andE. J. Galvez
"Searching for the helical-gradient force on chiral molecules", Proc. SPIE 10120, Complex Light and Optical Forces XI, 101200M (27 February 2017); https://doi.org/10.1117/12.2253268
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J. A. Jones, B. Regan, J. Painter, J. Mills, I. Dutta, B. Khajavi, E. J. Galvez, "Searching for the helical-gradient force on chiral molecules," Proc. SPIE 10120, Complex Light and Optical Forces XI, 101200M (27 February 2017); https://doi.org/10.1117/12.2253268