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Multi-Purpose Nanovoid Array Plasmonic Sensor Produced by Direct Laser Patterning.

Dmitrii V Pavlov1,2, Alexey Yu Zhizhchenko3,4, Mitsuhiro Honda5

  • 1Far Eastern Federal University, Vladivostok 690041, Russia. pavlov_dim@mail.ru.

Nanomaterials (Basel, Switzerland)
|September 25, 2019
PubMed

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Summary
This summary is machine-generated.

Researchers developed a versatile plasmonic sensor using laser-patterned gold films. This cost-effective sensor detects gases and biomolecules with high sensitivity, enabling label-free molecular identification.

Area of Science:

  • Plasmonics and Nanophotonics
  • Materials Science
  • Biosensing

Background:

  • Surface plasmon (SP) resonances are crucial for optical sensing applications.
  • Developing cost-effective and reproducible fabrication methods for plasmonic nanostructures is essential.
  • Nanovoid arrays offer tunable optical properties for enhanced sensing.

Purpose of the Study:

  • To demonstrate a multi-purpose plasmonic sensor based on a nanovoid array.
  • To investigate the tunability of surface plasmon resonances by altering array periodicity and nanovoid shape.
  • To evaluate the sensor's performance in bulk refractive index sensing and analyte detection.

Main Methods:

  • Fabrication of a nanovoid array on thin glass-supported Au films using direct femtosecond laser patterning.
Keywords:
direct femtosecond laser printingnanovoid arraysplasmonic sensorsrefractive index and gas sensing

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  • Excitation of near-infrared surface plasmon resonances under normal incidence.
  • Characterization of the sensor's sensitivity and figure of merit in bulk refractive index tests.
  • Demonstration of gas and ultra-thin analyte layer identification.
  • Utilizing isolated nanovoids for surface-enhanced vibration spectroscopy for label-free molecular identification.

    • Main Results:

    • The nanovoid array exhibited tunable near-IR SP resonances.
    • The sensor achieved a sensitivity of approximately 1600 nm/RIU with a figure of merit of 12.
    • Successful identification of gases and ultra-thin analyte layers was demonstrated.
    • Strong electromagnetic field enhancement was observed at isolated nanovoids, enabling label-free molecular identification.

    Conclusions:

    • The developed plasmonic sensor is cost-effective, highly reproducible, and versatile.
    • The sensor shows significant potential for bioassay experiments and label-free molecular identification.
    • Tailoring nanovoid geometry and array periodicity allows for optimized sensor performance for specific applications.