High-performance fiber plasmonic sensor by engineering the dispersion of hyperbolic metamaterials composed of Ag/TiO2
| Autor: | Yunhan Luo, Huadan Zheng, Yaofei Chen, Shiqi Hu, Ming Xian Liu, Yu Chen, Zhe Chen, Gui-Shi Liu, Lei Chen, Nur Hidayah Azeman |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Optics Fiber optic sensor 0103 physical sciences Dispersion (optics) Figure of merit Sensitivity (control systems) Fiber 0210 nano-technology business Refractive index Electron-beam lithography Plasmon |
| Zdroj: | Optics Express. 28:25562 |
| ISSN: | 1094-4087 |
| DOI: | 10.1364/oe.397461 |
| Popis: | Hyperbolic metamaterials (HMMs) have attracted increasing attentions because of their unique dispersion properties and the flexibility to control the dispersion by changing the components and fractions of the composed materials. In this work, for the first time, we demonstrate a plasmonic sensor based on a side-polished few-mode-fiber coated with a layered of HMM, which is composed of alternating layers of Ag and TiO2. To optimize the sensor performance, the effects of the metal filling fraction (ρ) and the number of bilayers (Nbi) on the HMM dispersion are thoroughly engineered with the effective medium theory and the finite element method. It is found that the HMM with ρ=0.7 and Nbi = 3 can provide the average sensitivity of 5114.3 nm/RIU (RIU: refractive index unit), and the highest sensitivity 9000 nm/RIU in the surrounding refractive index (SRI) ranging from 1.33 to 1.40 RIU. The corresponding figure of merit (FOM) reaches a maximum of 230.8 RIU-1 which is much higher than that of the conventional silver film based SPR sensor. The influence of ρ and Nbi on the sensitivity are well explained from the aspects of the electrical field distribution and the dispersion relationship. This work opens a gate to significantly improve fiber plasmonic sensors performance by engineering the HMM dispersion, which is expected to meet the emergent demand in the biological, medical and clinical applications. |
| Databáze: | OpenAIRE |
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