Enantioselective optical gradient forces using 3D structured vortex light

Forbes, Kayn A.; Green, Dale

doi:10.1016/j.optcom.2022.128197

Cited by 22 publications

(29 citation statements)

References 51 publications

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“…A proposal to directly measure the optical chirality of tightly-focused Gaussian beams has recently been put forward 44 . It is worth noting that this method would be readily applied to all the structured light chirality in this work 45 .…”

Section: Nanoscale Accepted Manuscriptmentioning

confidence: 99%

“…44 It is worth noting that this method would be readily applied to all the structured light chirality in this work. 45 The behaviour of the optical chirality density C ˉG as a function of propagation distance z is given in Fig. 2.…”

Section: Gaussian Beamsmentioning

confidence: 99%

“…44 It is worth noting that this method would be readily applied to all the structured light chirality in this work. 45…”

Section: Optical Chirality Density Of Optical Vortices At the Nanoscalementioning

confidence: 99%

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Optical chirality of vortex beams at the nanoscale

Green

Forbes

2023

Nanoscale

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Section: Nanoscale Accepted Manuscriptmentioning

confidence: 99%

Section: Gaussian Beamsmentioning

confidence: 99%

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Optical chirality of vortex beams at the nanoscale

Green

Forbes

2023

Nanoscale

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“…Interest is growing in the possibility of an optical force that discriminates between the enantiomers of a small1 chiral molecule [1][2][3]. Such a force could be used in a wealth of potential applications, including chiral molecular matter-wave interferometry for precision metrology and tests of fundamental physics [4][5][6], the distillation of chiral molecules in chiral optical lattices as a novel form of matter [7], and the resolution of enantiomers for use in chemistry and biology [4,[8][9][10][11][12][13]; a task of particular importance [14,15]. The chiral optical forces proposed to date, however, are extremely weak, as they rely on magnetic-dipole and electric-quadrupole interactions.…”

Section: Introductionmentioning

confidence: 99%

“…chiral optical forces [1][2][3][4][5][6][7][8][9][10][11][12][13] should be enormously more robust and easier to realise using our chiral optical force instead. Throughout, we work in vacuum in an inertial frame of reference with time 𝑡 and position vector r = 𝑥 x + 𝑦 ŷ + 𝑧ẑ, where 𝑥, 𝑦, and 𝑧 are laboratory-fixed Cartesian coordinates and x, ŷ, and ẑ are the associated unit vectors.…”

Section: Introductionmentioning

confidence: 99%

Strong chiral optical force for small chiral molecules based on electric-dipole interactions, inspired by the asymmetrical hydrozoan Velella velella

Cameron¹,

McArthur²,

Yao³

2023

Preprint

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Drawing inspiration from a remarkable chiral force found in nature, we show that a static electric field combined with an optical lin-perp-lin polarization standing wave can exert a chiral optical force on a small chiral molecule that is several orders of magnitude stronger than other chiral optical forces proposed to date, being based on leading electric-dipole interactions rather than relying on weak magnetic-dipole and electric-quadrupole interactions. Our chiral optical force applies to most small chiral molecules, including isotopically chiral molecules, and does not require a specific energy-level structure. Potential applications range from chiral molecular matter-wave interferometry for precision metrology and tests of fundamental physics to the resolution of enantiomers for use in chemistry and biology.

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Optical Manipulation of Nanoparticles: A Selective Excitation Approach Using Highly Focused Orbital Angular Momentum Beams

Sadafi

Taghavi

Mota

et al. 2023

Advanced Photonics Research

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Orbital angular momentum and polarization states of highly focused vector vortex beams can be engineered to selectively excite the desired multipoles in nanoparticles, making them ideal candidates for complex optical applications. A platform based on the generalized Lorenz–Mie theory integrated with the complex source point method is developed to model the interaction of such beams with particles analytically. The existing platform is extended for obtaining the full‐vector electromagnetic fields, outlining the observed effects that adding a substrate brings to the problem space. Despite the cross‐coupling between different multipoles induced by the substrate, it is concluded that the proper choice of beam parameters enables the selective excitation of multipoles even in the critical case of a plasmonic substrate. The proposed formalism is general and allows a multipole study of the optical forces. Selective excitation is exploited to control the imparted optical forces on particles placed on a plasmonic substrate. 3D trapping regions are achievable for highly absorptive and high‐refractive‐index particles. Motion trajectory analyses are performed to demonstrate the trapping stability, concluding that highly focused optical beams, owing to the exceptional selective excitation ability, are suitable candidates for novel optical manipulation applications.

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Enantioselective optical gradient forces using 3D structured vortex light

Cited by 22 publications

References 51 publications

Optical chirality of vortex beams at the nanoscale

Optical chirality of vortex beams at the nanoscale

Strong chiral optical force for small chiral molecules based on electric-dipole interactions, inspired by the asymmetrical hydrozoan Velella velella

Optical Manipulation of Nanoparticles: A Selective Excitation Approach Using Highly Focused Orbital Angular Momentum Beams

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