Collective motion of chiral Brownian particles controlled by a circularly-polarized laser beam

Hernández, Roberto Ramírez; Sevilla, Francisco J.; Mazzulla, A.; Pagliusi, P.; Pellizzi, Nicola; Cipparrone, G.

doi:10.1039/c9sm02404b

Cited by 5 publications

(4 citation statements)

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“…Copyright 2016 Springer Nature; . (C) As an example of the discriminative action of chiral optical forces within confined optical volumes, ref studies the Brownian trajectories of a right-handed particle optically trapped by a circularly polarized laser trapping beam focused through an objective. Depending on the left/right circular polarization, the right-handed particle explores a different volume within the trap.…”

Section: Chiral Optical Forcesmentioning

confidence: 99%

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Chiral Light–Chiral Matter Interactions: an Optical Force Perspective

Genet

2022

ACS Photonics

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Optical forces are involved in many physical processes and are used routinely in the laboratory for manipulating and cooling matter, from the micro down to the quantum scales. It has been realized recently that new forms of optical forces can emerge when a chiral system is immersed within a chiral light field. These new forces involve not only the chirality of the system on which they exert their mechanical action, but the chirality itself of the optical field that generate them. As such, they have fascinating properties, the crucial one being that they are enantioselective. We will highlight recent and important advances in this newborn field of research, where the interactions and exchanges between theory and experiments are particularly strong. The key advances selected in this Perspective are representative of the vitality of the current research activity. These advances clearly point toward future designs for all-optical chiral separation strategies of high potential. They also shape new means for controlling chiral systems, such as atoms and molecules, at the quantum level. The viewpoint adopted in this Perspective overall aims at showing how chiral optical forces shed new light on chiral light−chiral matter interactions.

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Section: Chiral Optical Forcesmentioning

confidence: 99%

“…Depending on the left/right circular polarization, the right-handed particle explores a different volume within the trap. Reprinted with permission from ref . Copyright 2020 Royal Society of Chemistry; .…”

Section: Chiral Optical Forcesmentioning

confidence: 99%

Chiral Light–Chiral Matter Interactions: an Optical Force Perspective

Genet

2022

ACS Photonics

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“…It has been shown, that in these systems, the orientational defects have dynamical properties, which in turn depend on the respective topological charges [56][57][58]. It seems therefore very reasonable to assume, that network topological charges will carry interesting dynamical properties in collectively moving L-shaped or other chiral swimmers [59][60][61][62].…”

Section: Discussionmentioning

confidence: 99%

Network topology of interlocked chiral particles

Monderkamp¹,

Windisch²,

Wittmann³

et al. 2023

Preprint

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Self-assembly of chiral particles with an L-shape is explored by Monte-Carlo computer simulations in two spatial dimensions. For sufficiently high packing densities in confinement, a carpet-like texture emerges due to the interlocking of L-shaped particles, resembling a distorted smectic liquid crystalline layer pattern. From the positions of either of the two axes of the particles, two different types of layers can be extracted, which form distinct but complementary entangled networks. These coarse-grained network structures are then analyzed from a topological point of view. We propose a global charge conservation law by using an analogy to uniaxial smectics and show that the individual network topology can be steered by both confinement and particle geometry. Our topological analysis provides a general classification framework for applications to other intertwined dual networks.

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“…[ 29 , 30 , 31 , 32 , 33 , 34 ] Most swimmers belong to the former class, but chiral swimmers offer advantages for problems like optimal surface coverage, [ 35 ] which are important for the survival of living microswimmers and possible applications of synthetic swimmers, such as the cleaning of wastewater. Importantly, chirality also plays a crucial role in the collective behavior of the swimmers, [ 36 , 37 , 38 ] and can lead to patterns such as arrays of rotating microflocks, [ 39 , 40 ] vortex arrays, [ 41 , 42 , 43 ] and synchronized colloidal cogwheels. [ 44 ] This rich phenomenology contrasts with a relatively limited list of mechanisms available to create chiral self‐propulsion.…”

Section: Introductionmentioning

confidence: 99%

Self‐Solidifying Active Droplets Showing Memory‐Induced Chirality

et al. 2023

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Most synthetic microswimmers do not reach the autonomy of their biological counterparts in terms of energy supply and diversity of motions. Here, this work reports the first all‐aqueous droplet swimmer powered by self‐generated polyelectrolyte gradients, which shows memory‐induced chirality while self‐solidifying. An aqueous solution of surface tension–lowering polyelectrolytes self‐solidifies on the surface of acidic water, during which polyelectrolytes are gradually emitted into the surrounding water and induce linear self‐propulsion via spontaneous symmetry breaking. The low diffusion coefficient of the polyelectrolytes leads to long‐lived chemical trails which cause memory effects that drive a transition from linear to chiral motion without requiring any imposed symmetry breaking. The droplet swimmer is capable of highly efficient removal (up to 85%) of uranium from aqueous solutions within 90 min, benefiting from self‐propulsion and flow‐induced mixing. These results provide a route to fueling self‐propelled agents which can autonomously perform chiral motion and collect toxins.

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Collective motion of chiral Brownian particles controlled by a circularly-polarized laser beam

Abstract: We demonstrate the emergence of circular collective motion in a system of spherical light-propelled Brownian particles. Light-propulsion occurs as consequence of the coupling between the chirality of polymeric particles —...

Cited by 5 publications

References 53 publications

Chiral Light–Chiral Matter Interactions: an Optical Force Perspective

Chiral Light–Chiral Matter Interactions: an Optical Force Perspective

Network topology of interlocked chiral particles

Self‐Solidifying Active Droplets Showing Memory‐Induced Chirality

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