Chongfan Technology
News
03
2026
-
06
Fiber-optic Tamm-plasmon metasurface tip for enhancing hydrogen sensing
Author:
The teams of Wei Peng and Yuzhang Liang at Dalian University of Technology have proposed a synthetic‑size‑engineered fiber‑optic Tamm plasmon (S‑FOTPP) sensing metatip, which enables flexible control of TPP resonance and sensing characteristics within a physically constrained two‑dimensional parameter space, thereby overcoming the limitations of conventional structural optimization. When the TPP resonance in the synthetic size space approaches twice the Bragg wavelength—corresponding to the characteristic optical scale of the supercell—the mode is driven into a phase‑sensitive state, allowing phase perturbations induced by hydrogenation in the Pd layer to be more efficiently converted into measurable wavelength shifts. Consequently, compared with traditional TPP and FP structures, the H₂‑sensing sensitivity is significantly enhanced, with a limit of detection (LOD) reaching the ppm level. Meanwhile, by leveraging photocatalytic effects to modulate reaction kinetics, the response and recovery times of the H₂‑sensing system are optimized to 7.7 seconds and 8.8 seconds, respectively. Furthermore, this study investigates how the response and recovery times of S‑FOTPP metamaterial tips with varying Pd‑layer thicknesses depend on pump laser power, thereby elucidating the relative contributions of thermal and nonthermal effects during the photocatalytic process. This work introduces a metatip that combines the high sensitivity afforded by synthetic size engineering, the rapid response enabled by photocatalysis, and scalable fabrication via thin‑film deposition, while highlighting the potential of photocatalysis to further enhance the performance of photonic devices.
The research findings were published in ACS Nano on May 29, 2026, under the title “Synthetic-Dimensions-Engineered Fiber-Optic Tamm Plasmon Metatips Enabling High-Dimensional Manipulation for Enhanced Hydrogen Sensing.”
Figure 1: Synthetic Size-Engineered Fiber Tamm Plasmon (S-FOTPP) Metasurface Tip for High-Sensitivity H₂ Detection
Figure 2: The advantages of the S‑TPP structure in multilayer thin films
Figure 3: Resonance characteristics and sensing performance of TPP structures in the synthetic (p, q) dimension space.
Figure 4: Experimental verification of sensitivity enhancement in S‑TPP metasurface tips.
Figure 5: Experimental measurement of H₂ concentration using an S-FOTPP metasurface tip.
Figure 6: Thickness-dependent photocatalytic kinetics in the Pd–H system
Source: Optics World
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