Optical separation and discrimination of chiral particles by vector beams with orbital angular momentum

Li, Manman; Yan, Shaohui; Zhang, Yanan; Chen, Xu

doi:10.1039/d1na00530h

Cited by 22 publications

(19 citation statements)

References 39 publications

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“…Furthermore, the enantioselective optical forces ( i.e. , chiral gradient force) are normally associated with evanescent 14,15 or superchiral 16–21 fields, with fast-changing spatial distributions on the sub-μm size.…”

Section: Introductionmentioning

confidence: 99%

“…This is due to the extremely weak nature of the enantioselective optical forces acting on the nanoscale specimens. Furthermore, the enantioselective optical forces (i.e., chiral gradient force) are normally associated with evanescent 14,15 or superchiral [16][17][18][19][20][21] elds, with fast-changing spatial distributions on the sub-mm size.…”

Section: Introductionmentioning

confidence: 99%

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Sieving nanometer enantiomers using bound states in the continuum from the metasurface

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sieving nanometer enantiomers using bound states in the continuum from the metasurface

et al. 2022

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“…The potential of sorting enantiomers using an all-optical method would have a profound impact on the drug and pharmaceutical industries, and as such there has been a substantial number of studies looking at enantioselective trapping schemes. These have predominantly involved using an unstructured laser source [8][9][10][11] and/or plasmonic enhancement systems [12][13][14][15][16][17][18][19][20][21][22][23][24] , though there have been a handful of studies employing structured light 20,[25][26][27][28][29] . Optical vortices are inherently chiral, their OAM per photon is where  is known as the topological charge.…”

Section: Introductionmentioning

confidence: 99%

Optical tweezing chiral particles with 3D structured light

Forbes

Green

2022

Nanophotonics IX

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In this work we highlight enantioselective optical gradient forces acting on Rayleigh-seized chiral particles present in 3D structured (non-paraxial) optical vortex tweezing systems. One discriminatory force originates from the circular polarization of the light and is similar to previous chiral optical gradient trapping forces. Much more remarkable is the other which is independent of the input beam's polarization state -even occurring for unpolarized lightand is not present in 2D structured light nor propagating plane waves. This latter chiral sorting mechanism allows for the enantioselective trapping of chiral particles into distinct rings in the transverse plane through conservative radial forces.

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“…Among which, optical manipulation of chiral particles has received much attention, due to its potential applications in optical chiral separation and identification. [12,18,[20][21][22] The concept of chirality, introduced by Lord Kelvin to designate the non-superimposable property of an object with its mirror image, pervades in nature from subatomic to galactic scales. [23] Chiral particles which with the same chemical composition but opposite chirality, called enantiomers, can have completely different chemical properties and biological functions.…”

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confidence: 99%

Enatioselective Rotation of Chiral Particles by Azimuthally Polarized Beams

Chen

Yan

et al. 2022

Advanced Photonics Research

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Light beam carries linear momentum, when it is scatted or absorbed by a particle, the transfer of momentum can cause the motion of the particle. Thus, the light beam can be used to manipulate particles, known as optical manipulation. [1] Due to its unique advantages of noncontact and noninvasive operation capability, optical manipulation has been widely used in modern scientific research, especially in biology, physical chemistry, and medicine. [2][3][4] One special but important class of optical manipulation is to rotate trapped particles. [5] This light-induced rotation can be achieved from the shape asymmetry of the particle [6,7] or the transfer of optical angular momentum from light to the particle. [8,9] Generally, photons may have two different types of angular momentum: optical spin angular momentum (SAM) and optical orbital angular momentum (OAM). The former is related to the state of polarization of light, which can cause the rotation of a particle around its own axis, whereas the latter is associated with the helical wavefront of light, which will result in the orbital rotation of particle around the optical axis. [10] The advent of new optical principles and methods has fostered the development of optical manipulation techniques. Various extraordinary optical manipulations, such as optical pulling, [11][12][13] transverse spin, [14][15][16] and left-handed optical torque, [17][18][19] etc. have been discovered and investigated. Among which, optical manipulation of chiral particles has received much attention, due to its potential applications in optical chiral separation and identification. [12,18,[20][21][22] The concept of chirality, introduced by Lord Kelvin to designate the non-superimposable property of an object with its mirror image, pervades in nature from subatomic to galactic scales. [23] Chiral particles which with the same chemical composition but opposite chirality, called enantiomers, can have completely different chemical properties and biological functions. [24] For example, one enantiomer forms a powerful medicament, while the other has no therapeutic effect or even may cause serious side effects. [25] Thus, the separation and identification of chiral substances consist of a very active, interdisciplinary, and meaningful research topic. [26][27][28][29] Traditional probes of chirality, such as circular dichroism and rotatory power, [30,31] typically provide an average chiral response of substances, failing in detecting the properties of single particles. In recent years, the study of chirality-dependent optical forces has attracted tremendous attention not only for the optical separation of enantiomers but also for the further chiral identification of single particles. [32][33][34][35][36][37][38][39][40][41][42] Proposed methods include using lateral optical forces to deflect paired enantiomers in opposite directions, [32][33][34][35] enantioselective transporting of particles by optical pulling forces and optical conveyor belt, [12,[36][37][38] as well as the enantioselective trappi...

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Optical separation and discrimination of chiral particles by vector beams with orbital angular momentum

Abstract: Chirality describes a reduced symmetry and abounds in nature. The handedness-dependent response usually occurs only when a chiral object interacts with the other chiral matter. Light carrying orbital angular momentum...

Cited by 22 publications

References 39 publications

Sieving nanometer enantiomers using bound states in the continuum from the metasurface

Sieving nanometer enantiomers using bound states in the continuum from the metasurface

Optical tweezing chiral particles with 3D structured light

Enatioselective Rotation of Chiral Particles by Azimuthally Polarized Beams

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