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The aim is to develop a highly sensitive SPR sensor for low-refractive-index aqueous environments.

January 22, 2026SensorsOpen Access

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

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The aim is to develop a highly sensitive SPR sensor for low-refractive-index aqueous environments.
Designed a dual-channel D-shaped photonic crystal fiber SPR sensor.
Incorporated a dual-layer gold/titanium dioxide film with gold nanoparticles.
Used a polished D-shaped structure with double-sided microfluidic channels.
Conducted finite element method simulations to evaluate sensor performance.
Achieved an average wavelength sensitivity of 5733 nm/RIU.
Peak sensitivity reached 15,500 nm/RIU at a refractive index of 1.40.
Gold nanoparticles provided a 1.47-fold enhancement in sensitivity compared to conventional designs.

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Novel sensor design enhances sensitivity for refractive index detection in biochemical applications, indicating improved performance.

Hua et al. (2026) studied this question.

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