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Rectangular plasmonic interferometer for high sensitive glycerol sensor.

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This study introduces a novel plasmonic interferometric sensor for biochemical detection. The sensor demonstrates high sensitivity and a promising figure of merit, enabling low-cost, real-time analysis.

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Area of Science:

  • Nanophotonics
  • Plasmonics
  • Biosensing

Background:

  • Plasmonic interferometric sensors offer potential for sensitive biochemical detection.
  • Existing sensor designs require optimization for enhanced performance and cost-effectiveness.

Purpose of the Study:

  • To investigate a novel plasmonic interferometric sensor for biochemical applications.
  • To experimentally and theoretically analyze the sensor's performance characteristics.

Main Methods:

  • Fabrication of a plasmonic interferometer using a gold film with a slit and rectangular grooves via focused ion beam milling.
  • Simulation of the sensor structure using 3D finite difference time-domain commercial software.
  • Experimental characterization of transmission spectra across a broadband wavelength range (400–800 nm).

Main Results:

  • Observed oscillation behavior in transmission spectra correlated with varying slit-groove distances (L).
  • Demonstrated red-shifted interference spectra upon increasing refractive indices, indicating sensing capability.
  • Achieved high sensitivity (4923 nm/RIU) and a figure of merit (214) at 729 nm.

Conclusions:

  • The developed plasmonic interferometer is functional across visible to near-infrared wavelengths.
  • The study confirms the feasibility of fabricating low-cost, compact, and real-time high-throughput plasmonic interferometers.
  • The sensor shows significant potential for advanced biochemical sensing applications.