2015
DOI: 10.1117/12.2076041
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On the viability of achieving chiral separation through the optical manipulation of molecules

Abstract: Several different optical methods have recently been proposed for the potential separation of chiral molecules according to their intrinsic handedness. Applying fundamental symmetry and electrodynamical principles provides a perspective that casts doubt over the viability of some of the more extravagant claims. However there is a genuine basis for achieving chiral separation by using circularly polarized light to deliver chirally sensitive optical forces. The mechanism comes into play when molecules (or nanosc… Show more

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Cited by 3 publications
(11 citation statements)
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“…Unfortunately, the form reported by Bradshaw and Andrews for ∆W , as seen above, is incorrect and their neglect of electric-quadrupole contributions cannot be justified. Consequently, the results seen in equations ( 10), ( 13), ( 15), ( 16), ( 17), ( 18) and ( 19) of [12]; (4), ( 5), ( 7) and ( 8) of [13]; (10), ( 11), ( 12), ( 13), ( 17), ( 19) and ( 21) of [14] and ( 1) and ( 2) of [16] are in error, as they are not uniquely defined: their forms change with changes in the location chosen for the origin of the molecular multipole expansion. An energy shift and associated force cannot take values that depend on the manner in which we choose to calculate them.…”
Section: Uniqueness Of Predictionsmentioning
confidence: 94%
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“…Unfortunately, the form reported by Bradshaw and Andrews for ∆W , as seen above, is incorrect and their neglect of electric-quadrupole contributions cannot be justified. Consequently, the results seen in equations ( 10), ( 13), ( 15), ( 16), ( 17), ( 18) and ( 19) of [12]; (4), ( 5), ( 7) and ( 8) of [13]; (10), ( 11), ( 12), ( 13), ( 17), ( 19) and ( 21) of [14] and ( 1) and ( 2) of [16] are in error, as they are not uniquely defined: their forms change with changes in the location chosen for the origin of the molecular multipole expansion. An energy shift and associated force cannot take values that depend on the manner in which we choose to calculate them.…”
Section: Uniqueness Of Predictionsmentioning
confidence: 94%
“…Bradshaw and Andrews have expressed their view that dispersive optical forces derive from "forward Rayleigh scattering" [12,13,14,15,16]. Specifically, that these forces arise as the gradients of energy shifts, the forms of which follow from second-order perturbation theory:…”
Section: The Nature Of An Optical Forcementioning
confidence: 99%
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“…Chirality is a ubiquitous natural phenomenon met in various areas of science and technology ranging from physics of fundamental forces and practical aspects of drug design to studies on the origin of life and biomolecular homochirality [1]. Differentiation and separation of enantiomers in a mixture is an important problem, involving measurements of enantiomeric excess, handedness of a given compound, and devising techniques for manipulating chiral molecules [2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”
mentioning
confidence: 99%