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Plasmonic Sensing with 3D Printed Optics.

Samuel S Hinman1, Kristy S McKeating1, Quan Cheng1

  • 1Environmental Toxicology and ‡Department of Chemistry, University of California-Riverside , Riverside, California 92521, United States.

Analytical Chemistry
|November 21, 2017
PubMed
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Researchers demonstrate 3D printing of custom optical prisms for advanced biosensing. This novel technique enables sensitive detection of bacterial toxins using plasmonic sensing platforms.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Biotechnology

Background:

  • Three-dimensional (3D) printing offers versatile manufacturing but precise optical component fabrication for biosensing remains a challenge.
  • Kretschmann-configured surface plasmon resonance (SPR) is a sensitive technique for detecting analytes.
  • High-performance biosensing requires high-quality optical components for efficient light manipulation.

Purpose of the Study:

  • To demonstrate the fabrication of high-quality, custom optical prisms using 3D printing for plasmonic biosensing.
  • To assess the performance of 3D printed prisms in detecting bacterial toxins.
  • To showcase the adaptability of 3D printing for creating diverse optical sensing platforms.

Main Methods:

  • Stereolithography (3D printing) was used to fabricate custom prisms.

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  • Benchtop polishing was applied to achieve smooth surfaces for plasmon propagation.
  • Kretschmann-configuration SPR was employed for sensing experiments.
  • Total internal reflection spectroscopy was used for in situ monitoring.

    • Main Results:

    • 3D printed prisms supported surface plasmon polariton propagation after gold deposition.
    • The fabricated sensors exhibited high bulk refractive index sensitivity.
    • Trace levels of cholera toxin were successfully discriminated on a supported lipid membrane.
    • Varied prism geometries were printed, demonstrating manufacturing flexibility.

    Conclusions:

    • This study presents the first example of 3D printed light-guiding sensing platforms.
    • 3D printing enables the precise fabrication of optical components for high-performance biosensing.
    • The developed technique offers a versatile and broad perspective for optical detection applications.