Enhanced Sensitivity in D-Shaped Optical Fiber SPR Sensor via Ag-α-Fe2O3 Grating
Shuai Yuan, Bingyang Yuan, Jiu Deng
TL;DR
This paper presents a D-shaped optical fiber sensor with improved sensitivity using a silver-hematite composite grating for better detection in biomedical and environmental applications.
Contribution
The novel contribution is the optimized Ag-α-Fe2O3 grating design that enhances electric field confinement and sensor sensitivity.
Findings
A 45 nm silver layer and 12 nm α-Fe2O3 layer provide optimal electric field confinement.
A 30 nm grating gap width maximizes sensitivity through enhanced localized surface plasmon resonance.
A 0.5 μm residual cladding thickness balances detection accuracy and sensitivity.
Abstract
The development of high-performance optical fiber sensors based on surface plasmon resonance (SPR) represents a significant advancement in precision detection technology, particularly for biomedical and environmental monitoring applications requiring real-time response and minimal sample consumption. This research conducts a systematic numerical investigation of a D-shaped fiber SPR sensor incorporating an optimized silver-hematite (Ag-α-Fe2O3) composite grating structure. Through comprehensive finite element simulations and parameter analysis, we demonstrate that controlling the silver layer thickness at 45 nm while maintaining the α-Fe2O3 thickness at 12 nm achieves optimal electric field confinement. The grating gap width optimization at 30 nm enables maximum sensitivity through enhanced localized surface plasmon resonance effects, while the residual cladding thickness of 0.5 μm…
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Taxonomy
TopicsAdvanced Fiber Optic Sensors · Plasmonic and Surface Plasmon Research · Gold and Silver Nanoparticles Synthesis and Applications