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Gold Nanoparticle-Enhanced Dual-Channel Fiber-Optic Plasmonic Resonance Sensor.

Fengxiang Hua1, Haopeng Shi1, Qiumeng Chen1

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|January 28, 2026
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Summary
This summary is machine-generated.

This study presents a novel photonic crystal fiber sensor for enhanced refractive index detection in aqueous solutions. The new design significantly improves sensitivity, overcoming challenges in low-refractive-index environments.

Keywords:
gold nanoparticleslocalized surface plasmon resonancephotonic crystal fibersensorsurface plasmon resonance

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Area of Science:

  • Photonics
  • Nanotechnology
  • Chemical Sensing

Background:

  • Surface plasmon resonance (SPR) sensors using photonic crystal fibers (PCFs) are promising for high-precision detection.
  • Achieving high sensitivity in low-refractive-index (RI) aqueous environments is challenging due to weak light-matter interactions.

Purpose of the Study:

  • To design and propose a novel dual-channel D-shaped PCF-SPR sensor for enhanced RI sensing.
  • To improve sensitivity in the RI range of 1.34-1.40, particularly for aqueous environments.

Main Methods:

  • A dual-channel D-shaped PCF-SPR sensor design incorporating a dual-layer gold/titanium dioxide film.
  • Deposition of gold nanoparticles to enhance both propagating and localized SPR effects.
  • Integration of double-sided microfluidic channels to strengthen light-matter interaction.

Main Results:

  • The proposed sensor achieved an average wavelength sensitivity of 5733 nm/RIU and a peak sensitivity of 15,500 nm/RIU.
  • Gold nanoparticles enhanced sensitivity by approximately 1.47-fold compared to conventional structures.
  • Finite element method simulations validated the sensor's performance.

Conclusions:

  • The novel D-shaped PCF-SPR sensor demonstrates significantly improved RI sensing performance.
  • Hybrid plasmonic nanostructures and optimized waveguide design are effective for advancing RI sensing.
  • The sensor shows potential for high-precision detection in biochemical and chemical sensing applications.