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Dual-mode surface plasmon resonance sensor chip using a grating 3D-printed prism.

Chutiparn Lertvachirapaiboon1, Akira Baba1, Kazunari Shinbo1

  • 1Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-nocho, Nishi-ku, Niigata, 950-2181, Japan.

Analytica Chimica Acta
|January 24, 2021
PubMed
Summary

This study presents a novel 3D-printed grating prism surface plasmon resonance (SPR) sensor chip. The developed sensor chip enables dual-mode SPR excitation, offering enhanced sensitivity for optical sensing applications.

Keywords:
3D printingGratingPolymeric prismSoft lithographySurface plasmon resonance

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Area of Science:

  • Optoelectronics and Photonics
  • Materials Science and Engineering
  • Nanotechnology

Background:

  • Surface Plasmon Resonance (SPR) is a powerful optical sensing technique.
  • Traditional SPR sensor fabrication can be complex and costly.
  • There is a need for compact, versatile, and cost-effective SPR sensor platforms.

Purpose of the Study:

  • To develop a novel method for fabricating a grating prism SPR sensor chip using 3D printing and soft lithography.
  • To investigate the dual-mode SPR excitation characteristics of the fabricated sensor chip.
  • To evaluate the refractive index sensitivity and potential applications of the developed SPR sensor.

Main Methods:

  • Fabrication of a grating prism using stereolithography 3D printing and soft lithography.
  • Deposition of a gold film onto the grating prism.
  • 3D printing of a liquid cell and prism holder for an integrated sensor chip.
  • Characterization of SPR excitation spectra using a spectrometer and rotation stage.

Main Results:

  • Successful fabrication of a compact and practical 3D-printed grating prism SPR sensor chip.
  • Observation of dual-mode SPR excitations (prism-coupling SPR and grating-coupling SPR) with distinct wavelength shifts.
  • Achieved high refractive index sensitivities of 2924.4 nm RIU⁻¹ for PC-SPR and 414.9 nm RIU⁻¹ for GC-SPR.
  • Demonstrated simultaneous SPR excitation shifts in response to changes in local refractive index.

Conclusions:

  • The developed 3D printing-based fabrication method offers a versatile approach for creating advanced SPR sensor chips.
  • The dual-mode SPR excitation provides enhanced sensing capabilities and tunable excitation wavelengths.
  • This technology holds promise for a broad range of optical sensing applications, particularly in detecting changes in refractive index.