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Related Concept Videos

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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Isomerism in Complexes
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Related Experiment Video

Updated: Jul 9, 2025

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
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Tuning the Plexcitonic Optical Chirality Using Discrete Structurally Chiral Plasmonic Nanoparticles.

Qingqing Cheng1, Jian Yang2, Lichao Sun1

  • 1College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.

Nano Letters
|December 1, 2023
PubMed
Summary

Researchers created tunable chiral plexcitonic systems using gold-silver nanorods and J aggregates. This work advances strong light-matter interactions and optical chirality for chiroptical devices.

Keywords:
chiral nanoparticlescircular dichroismplasmon−exciton couplingplexcitonic optical chiralitystrong coupling

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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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Area of Science:

  • Plasmonics and Nanophotonics
  • Strong Light-Matter Interactions
  • Chiroptical Spectroscopy

Background:

  • Chiral plasmonic materials exhibit unique chiroptical properties with applications in photonics, sensing, and biomedicine.
  • Strong coupling between chiral plasmonic nanoparticles and excitons is crucial for advanced light-matter interactions but remains underexplored.
  • Plexcitonic systems offer a platform for manipulating light-matter interactions through coupled plasmon and exciton resonances.

Purpose of the Study:

  • To construct and investigate a chiral plexcitonic system by coupling chiral gold-silver (AuAg) nanorods with J aggregates.
  • To tune the optical chirality of the plexcitonic system by controlling plasmon-exciton coupling.
  • To explore the potential of such systems for advanced chiroptical applications.

Main Methods:

  • Fabrication of chiral AuAg nanorods and J aggregate excitonic systems.
  • Characterization of chiral plasmon-exciton coupling using Circular Dichroism (CD) spectroscopy.
  • Analysis of spectral features, including Rabi splitting and anticrossing, to confirm strong coupling.

Main Results:

  • Successful construction of a chiral plasmon-exciton system demonstrating tunable optical chirality.
  • Observation of distinct Rabi splitting and anticrossing in CD spectra, indicative of strong coupling.
  • Demonstration that plexcitonic optical chirality can be fine-tuned by controlling molecular exciton density and energy detuning.

Conclusions:

  • The study successfully demonstrates tunable chiral plexcitonic systems with potential for enhanced light-matter interactions.
  • Fine-tuning of optical chirality in these systems opens avenues for novel chiroptical devices.
  • This work paves the way for further exploration of chiral light-matter interactions in nanophotonics.