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Dynamic birefringence and chirality of magnetically controllable assemblies of anisotropic plasmonic nanoparticles in dispersion

Author

Listed:
  • Hyojung Kang

    (Ewha Womans University)

  • Yoojung Jeon

    (Ewha Womans University)

  • Kyungnae Baek

    (Ewha Womans University)

  • SeonJu Park

    (Ewha Womans University)

  • Jayoon Lee

    (Ewha Womans University)

  • Tae Soup Shim

    (Ajou University
    Ajou University)

  • Jerome K. Hyun

    (Ewha Womans University)

  • So-Jung Park

    (Ewha Womans University
    Ewha Womans University)

Abstract

The ability to control the orientation and arrangement of plasmonic nanoparticles with shape anisotropy offers a promising route to achieving highly tunable optical properties. In this study, we introduce a synthetic approach for magnetically controllable plasmonic nanoparticles (MPs) consisting of an anisotropic gold core encapsulated by an iron oxide shell. The superparamagnetic property of the iron oxide shell enables rapid, reversible, and remotely controlled alignment of MPs, allowing for dynamic manipulation of their optical properties. Linearly aligned MPs demonstrate tunable transmission colors via plasmon-mediated birefringence. Helical MP arrays exhibit circular dichroism of up to 12° and g-factors reaching 0.21—the highest reported value for solution-phase assemblies of achiral nanoparticles. The synthetic method is applicable to nanoparticles of various sizes and shapes, highlighting its generality and expandability.

Suggested Citation

  • Hyojung Kang & Yoojung Jeon & Kyungnae Baek & SeonJu Park & Jayoon Lee & Tae Soup Shim & Jerome K. Hyun & So-Jung Park, 2025. "Dynamic birefringence and chirality of magnetically controllable assemblies of anisotropic plasmonic nanoparticles in dispersion," Nature Communications, Nature, vol. 16(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-62508-0
    DOI: 10.1038/s41467-025-62508-0
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    References listed on IDEAS

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