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Plasmonic Nanoslit Arrays Fabricated by Serial Bideposition: Optical and Surface-Enhanced Raman Scattering Study.

Samir Kumar1, Yusuke Doi1, Kyoko Namura1

  • 1Department of Micro Engineering, Graduate School of Engineering, Kyoto University, Nishikyo, Kyoto 615-8540, Japan.

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|January 13, 2022
PubMed
Summary

Researchers developed a low-cost, flexible plasmonic nanoslit sensor for surface-enhanced Raman spectroscopy (SERS). This novel fabrication method overcomes previous limitations, enabling sensitive detection of molecules like bilirubin.

Keywords:
Ag nanoslitFDTDMonte Carlo simulationSERSdynamic oblique angle deposition

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Spectroscopy

Background:

  • Combining localized surface plasmon and surface plasmon polariton structures can overcome individual drawbacks in SERS substrates.
  • Current manufacturing methods for such combined systems are complex, costly, and demanding.

Purpose of the Study:

  • To propose a facile fabrication method for a flexible plasmonic nanoslit surface-enhanced Raman scattering (SERS) sensor.
  • To overcome the limitations of existing sophisticated manufacturing techniques.

Main Methods:

  • Utilized periodic optical disk patterns for soft imprint lithography on polydimethylsiloxane.
  • Fabricated silver (Ag) nanoslits using serial bideposition with dynamic oblique angle deposition.
  • Characterized nanoslit structures physically and optically, comparing experimental results with Monte Carlo and finite-difference time-domain simulations.

Main Results:

  • Achieved excellent SERS performance with an enhancement factor of approximately 10^5.
  • Demonstrated a limit of detection of 5 x 10^-7 g/mL for Rhodamine 6G.
  • Successfully showcased biosensing capability through the detection of bilirubin.

Conclusions:

  • The proposed facile method enables cost-effective fabrication of flexible plasmonic nanoslit SERS sensors.
  • The developed sensor exhibits high sensitivity and potential for biosensing applications.
  • This approach offers a practical alternative to complex and expensive existing methods.