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   Articles with "optical activity" as a keyword



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Temperature‐Controlled Optical Activity and Negative Refractive Index

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recommendations! Published in 2021 at "Advanced Functional Materials"

DOI: 10.1002/adfm.202010249

Abstract: Chiral media exhibit optical activity, which manifests itself as differential retardation and attenuation of circularly polarized electromagnetic waves of opposite handedness. This effect can be described by different refractive indices for left- and right-handed waves… read more here.

Keywords: temperature; structure; optical activity; activity ... See more keywords

Chiral Seeded Growth of Gold Nanorods Into Fourfold Twisted Nanoparticles with Plasmonic Optical Activity

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recommendations! Published in 2022 at "Advanced Materials"

DOI: 10.1002/adma.202208299

Abstract: A robust and reproducible methodology to prepare stable inorganic nanoparticles with chiral morphology may hold the key to the practical utilization of these materials. An optimized chiral growth method to prepare fourfold twisted gold nanorods… read more here.

Keywords: fourfold twisted; growth; optical activity; gold nanorods ... See more keywords

Optical Activity of Chiral Excitons

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recommendations! Published in 2024 at "Advanced Materials"

DOI: 10.1002/adma.202415901

Abstract: Recent activity in the area of chiroptical phenomena has been focused on the connection between structural asymmetry, electron spin configuration and light/matter interactions in chiral semiconductors. In these systems, spin‐splitting phenomena emerge due to inversion… read more here.

Keywords: optical activity; chiral excitons; model; activity chiral ... See more keywords
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Optical Activity of Chiral Nanoscrolls

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recommendations! Published in 2017 at "Advanced Optical Materials"

DOI: 10.1002/adom.201600982

Abstract: A first quantum-mechanical theory of chiral semiconductor nanoscrolls is presented. The theory allows one to analytically calculate the rotatory strengths and dissymmetry factors of optical transitions inside monodisperse ensembles of randomly oriented nanoscrolls, as well… read more here.

Keywords: rotatory strengths; theory; chiral nanoscrolls; activity chiral ... See more keywords

A General Recipe for Nondispersive Optical Activity in Bilayer Chiral Metamaterials

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recommendations! Published in 2019 at "Advanced Optical Materials"

DOI: 10.1002/adom.201801729

Abstract: By mimicking broken mirror symmetry of naturally existing chiral materials, and exploiting even stronger magnetoelectric coupling, large optical activity has been realized in chiral metamaterials over the past decade. Nevertheless, most of chiral metamaterials demonstrated… read more here.

Keywords: optical activity; nondispersive optical; bilayer chiral; chiral metamaterials ... See more keywords
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Transition dipole coupling modeling of optical activity enhancements in macromolecular protein systems.

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recommendations! Published in 2018 at "Chirality"

DOI: 10.1002/chir.22778

Abstract: The transition dipole coupling model allows to vary systematically many parameters, such as chromophore geometries and transition dipoles. We used it to explore conditions favorable to chirality enhancement observed in many experiments on protein amyloidal… read more here.

Keywords: coupling modeling; transition dipole; transition; dipole coupling ... See more keywords

Comparative rotatory power of bent and twisted polyynes.

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recommendations! Published in 2023 at "Chirality"

DOI: 10.1002/chir.23579

Abstract: Linear polyynes of the formula C18 H2 (symmetry D∞h ) were bent in silico by progressively introducing CCC angles less than 180°. The bent structures (symmetry C2v ) were then twisted by introducing torsion angles… read more here.

Keywords: bent; rotatory power; optical activity; bent twisted ... See more keywords

Symmetry Breaking in Inorganic Nanostructures: Chirality vs. Optical Activity or Structural vs. Electronic Effects

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recommendations! Published in 2024 at "Israel Journal of Chemistry"

DOI: 10.1002/ijch.202400054

Abstract: This essay presents the viewpoint of the author on the topic of chirality and optical activity in nanostructures. It particularly focuses on the interaction of chiral molecules with plasmonic and excitonic nanocrystals and on induction… read more here.

Keywords: symmetry breaking; optical activity; breaking inorganic; inorganic nanostructures ... See more keywords

A Novel Incident Circular Polarized Light Raman Optical Activity (ICP‐ROA) Spectrometer With Advanced Polarization Control

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recommendations! Published in 2024 at "Journal of Raman Spectroscopy"

DOI: 10.1002/jrs.6733

Abstract: The design and setup of a novel and simple backscatter Raman optical activity (ROA) spectrometer with incident light circular polarization (ICP) is presented, constructed from commercially available components. Incident light polarization is controlled using a… read more here.

Keywords: polarization; raman optical; roa spectrometer; optical activity ... See more keywords

Chiral Nanoparticles with Enhanced Thermal Stability of Chiral Structures through Alloying.

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recommendations! Published in 2022 at "Small"

DOI: 10.1002/smll.202107657

Abstract: Metallic chiral nanoparticles (CNPs) promisingly function as asymmetric catalysts but lack an important study in thermal stability of optical activity that stems from metastable chiral lattices. In this work, annealing is applied to silver (Ag)… read more here.

Keywords: thermal stability; chiral nanoparticles; optical activity; cnps ... See more keywords

Optical activity of lysozyme in solution at 532 nm via signal-reversing cavity ring-down polarimetry

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recommendations! Published in 2020 at "Chemical Physics Letters"

DOI: 10.1016/j.cplett.2020.137345

Abstract: Abstract An improved optical cavity-based polarimetry method is employed to measure the optical activity of lysozyme in water solution, in the concentration range of 0–2 mg/ml. We employ a signal reversing technique, which gives the absolute… read more here.

Keywords: activity lysozyme; cavity; solution; optical activity ... See more keywords