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Ultrasensitive and label-free molecular-level detection enabled by light phase control in magnetoplasmonic nanoantennas

Author

Listed:
  • Nicolò Maccaferri

    (CIC nanoGUNE)

  • Keith E. Gregorczyk

    (CIC nanoGUNE)

  • Thales V. A. G. de Oliveira

    (CIC nanoGUNE)

  • Mikko Kataja

    (NanoSpin, Aalto University School of Science)

  • Sebastiaan van Dijken

    (NanoSpin, Aalto University School of Science)

  • Zhaleh Pirzadeh

    (Chalmers University of Technology)

  • Alexandre Dmitriev

    (Chalmers University of Technology)

  • Johan Åkerman

    (Materials Physics, KTH Royal Institute of Technology, Electrum 229, 16440 Kista, Sweden
    University of Gothenburg)

  • Mato Knez

    (CIC nanoGUNE
    IKERBASQUE, Basque Foundation for Science)

  • Paolo Vavassori

    (CIC nanoGUNE
    IKERBASQUE, Basque Foundation for Science)

Abstract

Systems allowing label-free molecular detection are expected to have enormous impact on biochemical sciences. Research focuses on materials and technologies based on exploiting localized surface plasmon resonances in metallic nanostructures. The reason for this focused attention is their suitability for single-molecule sensing, arising from intrinsically nanoscopic sensing volume and the high sensitivity to the local environment. Here we propose an alternative route, which enables radically improved sensitivity compared with recently reported plasmon-based sensors. Such high sensitivity is achieved by exploiting the control of the phase of light in magnetoplasmonic nanoantennas. We demonstrate a manifold improvement of refractometric sensing figure-of-merit. Most remarkably, we show a raw surface sensitivity (that is, without applying fitting procedures) of two orders of magnitude higher than the current values reported for nanoplasmonic sensors. Such sensitivity corresponds to a mass of ~0.8 ag per nanoantenna of polyamide-6.6 (n=1.51), which is representative for a large variety of polymers, peptides and proteins.

Suggested Citation

  • Nicolò Maccaferri & Keith E. Gregorczyk & Thales V. A. G. de Oliveira & Mikko Kataja & Sebastiaan van Dijken & Zhaleh Pirzadeh & Alexandre Dmitriev & Johan Åkerman & Mato Knez & Paolo Vavassori, 2015. "Ultrasensitive and label-free molecular-level detection enabled by light phase control in magnetoplasmonic nanoantennas," Nature Communications, Nature, vol. 6(1), pages 1-9, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7150
    DOI: 10.1038/ncomms7150
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    Cited by:

    1. Deeptha Ishwar & Rupa Haldavnekar & Krishnan Venkatakrishnan & Bo Tan, 2022. "Minimally invasive detection of cancer using metabolic changes in tumor-associated natural killer cells with Oncoimmune probes," Nature Communications, Nature, vol. 13(1), pages 1-20, December.

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