On chiral selectivity of enantiomers using a circularly polarized pulsed laser under resonant and off-resonant conditions

Ma, Yan; Salam, A.

doi:10.1016/j.chemphys.2005.11.001

Cited by 19 publications

(20 citation statements)

References 14 publications

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“…Theoretical proposals have suggested that large enantiomeric excesses could be attained [45,59,60], but the experimental work has mostly been limited to simple model systems [60]. The design of pulses for coherent control of molecular chirality is still a daunting theoretical challenge, and any solution to this challenge is specific to a single type of molecule.…”

Section: Chiral Photochemistry With Superhelical Lightmentioning

confidence: 99%

Spectroscopy in sculpted fields

2009

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Section: Chiral Photochemistry With Superhelical Lightmentioning

confidence: 99%

Spectroscopy in sculpted fields

2009

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“…Based on the contrast with the behaviour of a racemic mixture (left-handed and right-handed chiral molecules in equal proportion), for which an identical response is produced with circularly polarized light of either left or right polarized input, there have been claims of enantiomer-specific detection [22] and methods of spatial separation [15][16][17][18][23][24][25] for such molecules. Despite numerous past theoretical studies on optical methods to control or selective engage with molecular chirality-see for example [26][27][28][29][30][31][32][33][34][35][36]-the context for the recently renewed attention to such effects, especially in the physics community, may largely be credited to advances in experimental work on chiral metamaterials [37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Chiral discrimination in optical trapping and manipulation

Bradshaw¹,

Andrews²

2014

New J. Phys.

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When circularly polarized light interacts with chiral molecules or nanoscale particles powerful symmetry principles determine the possibility of achieving chiral discrimination, and the detailed form of electrodynamic mechanisms dictate the types of interaction that can be involved. The optical trapping of molecules and nanoscale particles can be described in terms of a forward-Rayleigh scattering mechanism, with trapping forces being dependent on the positioning within the commonly non-uniform intensity beam profile. In such a scheme, nanoparticles are commonly attracted to local potential energy minima, ordinarily towards the centre of the beam. For achiral particles the pertinent material response property usually entails an electronic polarizability involving transition electric dipole moments. However, in the case of chiral molecules, additional effects arise through the engagement of magnetic counterpart transition dipoles. It emerges that, when circularly polarized light is used for the trapping, a discriminatory response can be identified between left-and righthanded polarizations. Developing a quantum framework to accurately describe this phenomenon, with a tensor formulation to correctly represent the relevant molecular properties, the theory leads to exact analytical expressions for the associated energy landscape contributions. Specific results are identified for liquids and solutions, both for isotropic media and also where partial alignment arises due to a static electric field. The paper concludes with a pragmatic analysis of the scope for achieving enantiomer separation by such methods.

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“…These challenges, also faced by chiral nanotechnology, demand simple and cheap, yet unified and sensitive chiral analytical and separation methods. A number of original ways of separating enantiomers with the help of chiral light fields have been recently investigated as the possible basis for such methods192021222324252627282930. In this paper we propose an original path to the unification of enantioseparation methods through the use of the simplest chiral object in optics — circularly polarised light.…”

mentioning

confidence: 99%

Completely Chiral Optical Force for Enantioseparation

Rukhlenko

Tepliakov

Baimuratov

et al. 2016

Sci Rep

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Fast and reliable separation of enantiomers of chiral nanoparticles requires elimination of all the forces that are independent of the nanoparticle handedness and creation of a sufficiently strong force that either pushes different enantiomers in opposite directions or delays the diffusion of one of them with respect to the other. Here we show how to construct such a completely chiral optical force using two counterpropagating circularly polarized plane waves of opposite helicities. We then explore capabilities of the related enantioseparation method by analytically solving the problem of the force-induced diffusion of chiral nanoparticles in a confined region, and reveal that it results in exponential spatial dependencies of the quantities measuring the purity of chiral substances. The proposed concept of a completely chiral optical force can potentially advance enantioseparation and enantiopurification techniques for all kinds of chiral nanoparticles that strongly interact with light.

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On chiral selectivity of enantiomers using a circularly polarized pulsed laser under resonant and off-resonant conditions

Cited by 19 publications

References 14 publications

Spectroscopy in sculpted fields

Spectroscopy in sculpted fields

Chiral discrimination in optical trapping and manipulation

Completely Chiral Optical Force for Enantioseparation

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