Sensitivity enhancement and thermal compensation of LSPR-based optical fibre refractive index sensor using annealing of Au nanoparticles

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2025-08-28 DOI:10.1016/j.sna.2025.117015

Soroush Rostami, Mohammad Ismail Zibaii, Mohammad-Mahdi Babakhani-Fard, Azam Layeghi, Hamid Latifi

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引用次数: 0

Abstract

Plasmonic optical sensors are widely employed for various applications, including biomedical and chemical sensing. More accurate and precise detection can be achieved by ameliorating sensitivity and compensating for unwanted environmental interfering parameters, including temperature dependency. The present study demonstrates the effect of low annealing temperatures on localized surface plasmon resonance (LSPR) in flat tip fiber (FTF) sensors, which enhances the refractive index (RI) sensitivity and thermal compensation. The RI sensitivity of the sensor was measured in the range of 1.3332 RIU to 1.3604 RIU, and temperature sensitivity was measured in the range of 20℃ to 50℃ for annealed fiber optic probs at 100°C, 200°C, and 300°C, and an unannealed prob. Temperature-induced morphological changes of the properties of NPs in FTF-LSPR can significantly increase the RI sensitivity by approximately 134.4 %, improve the figure of merit (FOM) by around 487.5 %, and decrease the limit of detection (LOD) by about 60.2 %. Also, temperature annealing leads to thermal compensation of the LSPR sensor, making these sensors particularly suitable for biosensing applications and label-free detection. Furthermore, annealing at 300°C induced NP fusion, generating distinctive plasmonic characteristics by demonstrating transverse and longitudinal resonance modes, forming dual-dips spectral features with high potential applications in dual-sensing of RI and temperature for biosensing platforms.

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利用金纳米粒子退火的lsr型光纤折射率传感器的灵敏度增强和热补偿

等离子体光传感器广泛应用于各种应用，包括生物医学和化学传感。通过提高灵敏度和补偿不需要的环境干扰参数，包括温度依赖性，可以实现更准确和精确的检测。本文研究了低退火温度对扁平光纤（FTF）传感器局部表面等离子体共振（LSPR）的影响，增强了折射率（RI）的灵敏度和热补偿。传感器的RI灵敏度测量范围为1.3332 RIU ~ 1.3604 RIU，温度灵敏度测量范围为20℃~ 50℃，退火光纤探头在100°C、200°C、300°C和未退火探头。温度引起的FTF-LSPR中NPs性质的形态变化可以显著提高RI灵敏度约134.4 %，提高FOM约487.5 %，降低LOD约60.2 %。此外，温度退火导致LSPR传感器的热补偿，使这些传感器特别适合生物传感应用和无标签检测。此外，300°C退火诱导NP融合，通过展示横向和纵向共振模式产生独特的等离子体特征，形成双倾角光谱特征，在生物传感平台的RI和温度双传感中具有很高的应用潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...