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Dispersion and shape engineered plasmonic nanosensors

Author

Listed:
  • Hyeon-Ho Jeong

    (Max Planck Institute for Intelligent Systems
    Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL))

  • Andrew G. Mark

    (Max Planck Institute for Intelligent Systems)

  • Mariana Alarcón-Correa

    (Max Planck Institute for Intelligent Systems
    Institute for Physical Chemistry, University of Stuttgart)

  • Insook Kim

    (Max Planck Institute for Intelligent Systems
    Institute for Physical Chemistry, University of Stuttgart)

  • Peter Oswald

    (Max Planck Institute for Intelligent Systems)

  • Tung-Chun Lee

    (Max Planck Institute for Intelligent Systems
    University College London, Christopher Ingold Building)

  • Peer Fischer

    (Max Planck Institute for Intelligent Systems
    Institute for Physical Chemistry, University of Stuttgart)

Abstract

Biosensors based on the localized surface plasmon resonance (LSPR) of individual metallic nanoparticles promise to deliver modular, low-cost sensing with high-detection thresholds. However, they continue to suffer from relatively low sensitivity and figures of merit (FOMs). Herein we introduce the idea of sensitivity enhancement of LSPR sensors through engineering of the material dispersion function. Employing dispersion and shape engineering of chiral nanoparticles leads to remarkable refractive index sensitivities (1,091 nm RIU−1 at λ=921 nm) and FOMs (>2,800 RIU−1). A key feature is that the polarization-dependent extinction of the nanoparticles is now characterized by rich spectral features, including bipolar peaks and nulls, suitable for tracking refractive index changes. This sensing modality offers strong optical contrast even in the presence of highly absorbing media, an important consideration for use in complex biological media with limited transmission. The technique is sensitive to surface-specific binding events which we demonstrate through biotin–avidin surface coupling.

Suggested Citation

  • Hyeon-Ho Jeong & Andrew G. Mark & Mariana Alarcón-Correa & Insook Kim & Peter Oswald & Tung-Chun Lee & Peer Fischer, 2016. "Dispersion and shape engineered plasmonic nanosensors," Nature Communications, Nature, vol. 7(1), pages 1-7, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11331
    DOI: 10.1038/ncomms11331
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    Cited by:

    1. Nam Heon Cho & Young Bi Kim & Yoon Young Lee & Sang Won Im & Ryeong Myeong Kim & Jeong Won Kim & Seok Daniel Namgung & Hye-Eun Lee & Hyeohn Kim & Jeong Hyun Han & Hye Won Chung & Yoon Ho Lee & Jeong W, 2022. "Adenine oligomer directed synthesis of chiral gold nanoparticles," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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