Orbital angular momentum dichroism caused by the interaction of electric and magnetic dipole moments and the geometrical asymmetry of chiral metal nanoparticles

Guo, Yangzhe; Zhu, Guodong; Bian, Wanlu; Dong, Bin; Fang, Yurui

doi:10.1103/physreva.102.033525

Cited by 15 publications

(14 citation statements)

References 54 publications

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“…Moreover, while many studies focus on enhancing C , nanophotonic near-fields contain rich polarization properties, and the full use of these properties is just starting to be explored. − For example, polarized light confined to nanoscale dimensions can possess trochoidal polarizations with cycloid-like, cartwheeling field motion enabling trochoidal dichroism, which could provide complementary information to CD in the future. Furthermore, in addition to the unusual spin angular momentum of CP light, orbital angular momentum can also be introduced into structured beams, yielding highly twisted light that offers another promising route for sensitive chirality detection. − Finally, the near-fields of metamaterials provide a relatively limited volume for molecular exposure to regions of enhanced C . Therefore, realistic and large-scale molecular delivery mechanisms, such as efficient flow cells or large-area patterning, need to be devised.…”

Section: Future Prospects and Challengesmentioning

confidence: 99%

Nanophotonic Approaches for Chirality Sensing

Warning¹,

Miandashti²,

McCarthy³

et al. 2021

ACS Nano

180

154

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Chiral nanophotonic materials are promising candidates for biosensing applications because they focus light into nanometer dimensions, increasing their sensitivity to the molecular signatures of their surroundings. Recent advances in nanomaterial-enhanced chirality sensing provide detection limits as low as attomolar concentrations (10–18 M) for biomolecules and are relevant to the pharmaceutical industry, forensic drug testing, and medical applications that require high sensitivity. Here, we review the development of chiral nanomaterials and their application for detecting biomolecules, supramolecular structures, and other environmental stimuli. We discuss superchiral near-field generation in both dielectric and plasmonic metamaterials that are composed of chiral or achiral nanostructure arrays. These materials are also applicable for enhancing chiroptical signals from biomolecules. We review the plasmon-coupled circular dichroism mechanism observed for plasmonic nanoparticles and discuss how hotspot-enhanced plasmon-coupled circular dichroism applies to biosensing. We then review single-particle spectroscopic methods for achieving the ultimate goal of single-molecule chirality sensing. Finally, we discuss future outlooks of nanophotonic chiral systems.

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Section: Future Prospects and Challengesmentioning

confidence: 99%

Nanophotonic Approaches for Chirality Sensing

Warning¹,

Miandashti²,

McCarthy³

et al. 2021

ACS Nano

180

154

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“…Both are time-even psuedoscalars. Optical chirality is often used to describe the phenomenon of circular dichroism in molecules 4,34,35 and metasurfaces 27,36,37 . Optical helicity, ϒ, is a quantity describing the handedness of helical light.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear helical dichroism in chiral and achiral molecules

et al. 2022

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Chiral interactions are prevalent in nature, driving a variety of bio-chemical processes. Discerning the two non-superimposable mirror images of a chiral molecule, known as enantiomers, requires interaction with a chiral reagent with known handedness. Circularly polarized light beams are often used as a chiral reagent. Here, we demonstrate efficient chiral sensitivity with linearly polarized helical light beams carrying an orbital angular momentum of ±lh, in which the handedness is defined by the twisted wavefront structure tracing a left-or right-handed corkscrew pattern as it propagates in space. By probing nonlinear optical response, we show that helicity dependent nonlinear absorption occurs even in achiral molecules and can be precisely controlled. We model this effect by considering induced multipole moments in light-matter interactions. Design and control of light-matter interactions with helical light opens new opportunities in chiroptical spectroscopy, light-driven molecular machines, optical switching, and in-situ ultrafast probing of chiral systems and magnetic materials.

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“…Meanwhile, when the spin and orbital angular momenta have opposite signs, they cancel the superchiral near‐field. [ 6 ] The PSOI can result in a significant enhancement of the superchiral near‐field under the right conditions of the spin and orbital momenta.…”

Section: Spin‐orbit Interaction In Chiral Fieldsmentioning

confidence: 99%

“…[5] The absorption difference, that is, circular dichroism (CD), is widely used to distinguish the chiral states of molecules based on the different interactions of molecular enantiomers with left-hand and right-hand circularly polarized light (CPL), which is a chiral electromagnetic field. [6] However, the CD of small chiral molecules is very weak because the absorption cross sections of left and right CPL differ by less than one in a thousand. This is a result of the size mismatch of the molecules and the light wavelength.…”

Section: Introductionmentioning

confidence: 99%

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Plasmonic and Photonic Enhancement of Chiral Near‐Fields

Sun

Nie

et al. 2022

Laser & Photonics Reviews

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A chiral near‐field with a highly contorted electromagnetic field builds a bridge to match chiral molecules and light wavelengths with large size differences. It significantly enhances the circular dichroism of chiral molecules and has great prospects in chirality sensing, detection, trapping, and other chirality‐related applications. Surface plasmons feature outstanding light‐trapping and electromagnetic‐field‐concentrating abilities. Plasmonic chiral nanostructures facilitate light manipulation to generate superchiral near‐fields. Meanwhile, the nanophotonic structures have attracted significant interest to obtain strong chiral near‐fields due to their unique electromagnetic resonant properties. During the interaction of light and chiral materials, the chiral near‐field not only bridges the light and chiral molecules but is also responsible for the optical activities. This paper reviews state‐of‐the‐art studies on generating or enhancing chiral near‐fields using plasmonic and photonic nanostructures. The principle of chiral near‐fields and the development of chiral near‐fields with plasmonic and photonic nanostructures are reviewed. The properties and applications of enhanced chiral near‐fields for chiral molecule detection, spin‐orbit angular interaction, and the generation of the chiral optical force are examined. Finally, current challenges are discussed and a brief outlook of this field is provided.

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Orbital angular momentum dichroism caused by the interaction of electric and magnetic dipole moments and the geometrical asymmetry of chiral metal nanoparticles

Cited by 15 publications

References 54 publications

Nanophotonic Approaches for Chirality Sensing

Nanophotonic Approaches for Chirality Sensing

Nonlinear helical dichroism in chiral and achiral molecules

Plasmonic and Photonic Enhancement of Chiral Near‐Fields

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