Gomez-Cardona Nelson, Reyes-Vera Erick, Torres Pedro
Escuela de Física, Universidad Nacional de Colombia, sede Medellín, Medellín 050034, Colombia.
Departmento de Electrónica y Telecomunicaciones, Instituto Tecnológico Metropolitano, Medellín 050013, Colombia.
Sensors (Basel). 2020 Apr 9;20(7):2111. doi: 10.3390/s20072111.
In this paper, we propose and numerically analyze a novel design for a high sensitivity refractive index (RI) sensor based on long-range surface plasmon resonance in H-shaped microstructured optical fiber with symmetrical dielectric-metal-dielectric waveguide (DMDW). The influences of geometrical and optical characteristics of the DMDW on the sensor performance are investigated theoretically. A large RI analyte range from 1.33 to 1.39 is evaluated to study the sensing characteristics of the proposed structure. The obtained results show that the DMDW improves the coupling between the fiber core mode and the plasmonic mode. The best configuration shows 27 nm of full width at half maximum with a resolution close to 1.3 × 10 - 5 nm, a high sensitivity of 7540 nm/RIU and a figure of merit of 280 RIU - 1 . Additionally, the proposed device has potential for multi-analyte sensing and self-reference when dissimilar DMDWs are deposited on the inner walls of the side holes. The proposed sensor structure is simple and presents very competitive sensing parameters, which demonstrates that this device is a promising alternative and could be used in a wide range of application areas.
在本文中，我们提出并数值分析了一种基于具有对称介质-金属-介质波导（DMDW）的H形微结构光纤中的长程表面等离子体共振的高灵敏度折射率（RI）传感器的新颖设计。从理论上研究了DMDW的几何和光学特性对传感器性能的影响。评估了1.33至1.39的大折射率分析物范围，以研究所提出结构的传感特性。所得结果表明，DMDW改善了光纤芯模与等离子体模之间的耦合。最佳配置显示半高宽为27 nm，分辨率接近1.3×10 - 5 nm，高灵敏度为7540 nm/RIU，品质因数为280 RIU - 1。此外，当不同的DMDW沉积在侧孔内壁上时，所提出的器件具有多分析物传感和自参考的潜力。所提出的传感器结构简单，呈现出极具竞争力的传感参数，这表明该器件是一个有前途的替代方案，可用于广泛的应用领域。
