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Plasmonic nanoantenna hydrophones.

Ivan S Maksymov1, Andrew D Greentree1

  • 1ARC Centre of Excellence for Nanoscale BioPhotonics, School of Science, RMIT University, Melbourne, VIC 3001, Australia.

Scientific Reports
|September 10, 2016
PubMed
Summary

A single dipole plasmonic nanoantenna can function as an optical hydrophone for MHz-range ultrasound. This novel approach enhances sensitivity for biomedical imaging and nanoscale spectroscopy applications.

Area of Science:

  • Biomedical Imaging
  • Nanophotonics
  • Acoustics

Background:

  • Ultrasound is a critical tool in biomedical imaging and diagnostics.
  • Current hydrophone technology has limitations in sensitivity and resolution for certain applications.
  • Plasmonic nanoantennas offer unique optical properties for sensing applications.

Purpose of the Study:

  • To theoretically demonstrate a novel optical hydrophone using a single dipole plasmonic nanoantenna.
  • To investigate the use of high-order plasmon modes for enhanced ultrasound sensitivity.
  • To explore potential applications in high-resolution biomedical imaging and nanoscale spectroscopy.

Main Methods:

  • Theoretical modeling of a single dipole plasmonic nanoantenna.
  • Tuning the nanoantenna to a high-order plasmon mode.

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  • Simulating the nanoantenna's response to MHz-range ultrasound waves.

    • Main Results:

    • A single dipole plasmonic nanoantenna can act as an optical hydrophone for MHz-range ultrasound.
    • Operating on a high-order plasmon mode significantly increases sensitivity compared to fundamental modes.
    • The proposed nanoantenna hydrophone shows potential for advanced imaging and spectroscopy.

    Conclusions:

    • Plasmonic nanoantenna-based optical hydrophones offer a promising new technology for ultrasound detection.
    • This approach could enable higher resolution ultrasonic imaging of biological samples.
    • Potential applications include imaging cells, cancer tissues, blood vessels, and nanoscale Brillouin spectroscopy.