Tailoring Enhanced Optical Chirality: Design Principles for Chiral Plasmonic Nanostructures

Schäferling, Martin; Drégely, Daniel; Hentschel, Mario; Gießen, Harald

doi:10.1103/physrevx.2.031010

Cited by 384 publications

(560 citation statements)

References 37 publications

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“…[7] The local optical chirality depends strongly on the geometrical shape and arrangement of the nanostructures and enhancement factors higher than 100 have been calculated in the near field region of chiral oligomer structures. [34] In the left column of figure 4 As we have shown, by inserting Co layers in Au gammadions it is possible to obtain novel systems where both chiral and MO properties coexist. The structural helicity of these elements gives rise to a sizeable chirooptical activity (CD), in addition to which a MO activity (MCD), due to the presence of Co, is also present.…”

Section: Resultsmentioning

confidence: 99%

“…[28,29,30] This effect may allow developing new sensing strategies by making use of the magnetic field modulation of the chirality (C) of the electromagnetic (EM) field (socalled optical chirality) in this kind of systems. The local optical chirality, C(r), is given by ( ) = − 0 2 0 ( * ( ) ⋅ ( )), [31,32,33,34,35] where ω is the frequency of the EM field, E(r) and B(r) are the electric and magnetic components of the EM field at r, and C0 is a normalization constant corresponding to the modulus of the optical chirality for a left (right) circular polarized wave propagating in vacuum…”

Section: Resultsmentioning

confidence: 99%

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Magnetic field modulation of chirooptical effects in magnetoplasmonic structures

et al. 2014

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In this work we analyse the magnetic field effects on the chirooptical properties of nm has a larger chirooptical response than the resonance at 650 nm, which, on the other hand, exhibits a larger magnetic field modulation of its chirooptical response.This dissimilar behaviour is due to the different physical origin of the chirooptical and magneto-optical responses. Whereas the chirooptical effects are due to the geometry of the structures, the magneto-optical response is related to the intensity of the electromagnetic field in the magnetic (Co) layers. We also show that the optical chirality can be modulated by the applied magnetic field, which suggests

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Magnetic field modulation of chirooptical effects in magnetoplasmonic structures

et al. 2014

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“…Further, a significant increase in enantioselectivity was found when chiral molecules interact locally with electromagnetic fields with χ greater than in circularly polarized light [5]. Consequently, χ has since been used to study chiral plasmonic nanostructures [6,18,19,27]. It has identified near fields of high optical chirality enhancement, defined as the time-averaged optical chirality density [Eq.…”

Section: Chirality Conservationmentioning

confidence: 99%

“…It has identified near fields of high optical chirality enhancement, defined as the time-averaged optical chirality density [Eq. (2)] normalized by the corresponding value for circularly polarized light [18]. It has also been used to calculate wavelength-dependent quantities by spatially averaging near a structure of interest [19,28,29] or by evaluating at a single spatial coordinate [30].…”

Section: Chirality Conservationmentioning

confidence: 99%

“…In many of these applications, metallic nanostructures are utilized because their local plasmonic resonances can create concentrated electromagnetic fields [12]. When the nanostructures have a chiral shape, they can exhibit a high degree of optical activity [13][14][15][16][17] and induce intense highly twisted chiral near fields [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Optical Chirality Flux as a Useful Far-Field Probe of Chiral Near Fields

Poulikakos¹,

Gutsche

McPeak³

et al. 2016

ACS Photonics

134

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To optimize the interaction between chiral matter and highly twisted light, quantities that can help characterize chiral electromagnetic fields near nanostructures are needed. Here, by analogy with Poynting's theorem, we formulate the time-averaged conservation law of optical chirality in lossy dispersive media and identify the optical chirality flux as an ideal far-field observable for characterizing chiral optical near fields. Bounded by the conservation law, we show that it provides precise information, unavailable from circular dichroism spectroscopy, on the magnitude and handedness of highly twisted fields near nanostructures.

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Chiral Nanoparticle‐Induced Enantioselective Amplification of Molecular Optical Activity

Yang

Kwan

Zhang

et al. 2018

Adv Funct Materials

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Enantiodifferentiation is of fundamental importance in chiral chemistry and substantially requires high optical activity (OA) of enantiomers; but the enantiomeric OA is typically weak due to subwavelength molecular dimension, leading to a lack of sensitive enantiodifferentiation. A new approach is devised to evidently amplify the enantiomeric OA by anchoring axially chiral molecules containing the binaphthyl chromophore on silver chiral nanoparticles (AgCNPs) with a sub-5 nm helical pitch (P). Compared to the OA of dissolved enantiomers, that of (R)-and (S)-enantiomers can be enantioselectively amplified on right-handed and left-handed AgCNPs, respectively, in as high as one order of magnitude. The enantioselective amplification is probably ascribed to the enantiospecific adsorptioninduced change in the dihedral angle of the binaphthyl chromophore, resulting from chirality transfer from chiral footprints of the AgCNPs to the binaphthyl chromophore through the Ag-S bicontacts. The enantioselective amplification tends not to occur as long as P > 5 nm or on achiral Ag nanoparticles, due to a lack of the chirality transfer. This work imposes the significant application of enantiodifferentiation, which is on practical demand for producing single-enantiomer pharmaceutics and pesticides with no fatal adverse effect, on the emerging chiral metamaterials composed of metallic CNPs.

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Tailoring Enhanced Optical Chirality: Design Principles for Chiral Plasmonic Nanostructures

Cited by 384 publications

References 37 publications

Magnetic field modulation of chirooptical effects in magnetoplasmonic structures

Magnetic field modulation of chirooptical effects in magnetoplasmonic structures

Optical Chirality Flux as a Useful Far-Field Probe of Chiral Near Fields

Chiral Nanoparticle‐Induced Enantioselective Amplification of Molecular Optical Activity

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