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Chiroptical spectroscopy of a freely diffusing single nanoparticle

Author

Listed:
  • Johannes Sachs

    (Max Planck Institute for Intelligent Systems
    University of Stuttgart)

  • Jan-Philipp Günther

    (Max Planck Institute for Intelligent Systems
    University of Stuttgart)

  • Andrew G. Mark

    (Max Planck Institute for Intelligent Systems
    Metamaterial Inc.)

  • Peer Fischer

    (Max Planck Institute for Intelligent Systems
    University of Stuttgart)

Abstract

Chiral plasmonic nanoparticles can exhibit strong chiroptical signals compared to the corresponding molecular response. Observations are, however, generally restricted to measurements on stationary single particles with a fixed orientation, which complicates the spectral analysis. Here, we report the spectroscopic observation of a freely diffusing single chiral nanoparticle in solution. By acquiring time-resolved circular differential scattering signals we show that the spectral interpretation is significantly simplified. We experimentally demonstrate the equivalence between time-averaged chiral spectra observed for an individual nanostructure and the corresponding ensemble spectra, and thereby demonstrate the ergodic principle for chiroptical spectroscopy. We also show how it is possible for an achiral particle to yield an instantaneous chiroptical response, whereas the time-averaged signals are an unequivocal measure of chirality. Time-resolved chiroptical spectroscopy on a freely moving chiral nanoparticle advances the field of single-particle spectroscopy, and is a means to obtain the true signature of the nanoparticle’s chirality.

Suggested Citation

  • Johannes Sachs & Jan-Philipp Günther & Andrew G. Mark & Peer Fischer, 2020. "Chiroptical spectroscopy of a freely diffusing single nanoparticle," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18166-5
    DOI: 10.1038/s41467-020-18166-5
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    Cited by:

    1. Junfeng Ding & Tianran Wang & Zhiqiang Lin & Zhenyu Li & Jiaxuan Yang & Fujiang Li & Yan Rong & Xuesi Chen & Chaoliang He, 2025. "Chiral polypeptide hydrogels regulating local immune microenvironment and anti-tumor immune response," Nature Communications, Nature, vol. 16(1), pages 1-21, December.

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