激光锥形光纤与LSPR激活增强折射率传感

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

Sensors and Actuators A-physical Pub Date : 2025-10-17 DOI:10.1016/j.sna.2025.117181

Nurul Hidayat , Arif Hidayat , Latifatul Aisyah Nabila , Siti Azimatul Luthfiyyah , Ahmad Taufiq , Muhammad Safwan Abd Aziz , Hazri Bakhtiar

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引用次数: 0

摘要

局部表面等离子体共振（LSPR）效应与锥形光纤的集成显著提高了折射率（RI）传感性能。本研究介绍了一种优化的RI传感器，该传感器使用涂覆在锥形无芯终端光纤（TCTFs）上的金纳米球（AuNSs），其灵敏度显着提高。通过CO2激光功率的变化对TCTFs的锥腰直径进行了优化。随后，柠檬酸还原法制备了11.26 nm的平均尺寸的anas，并通过巯基化将其强附着在优化后的TCTF表面。紫外可见光谱（UV-Vis）记录的auns的LSPR峰为~ 522 nm。通过x射线衍射（XRD）和高分辨率透射电镜（HR-TEM）分别获得了AuNSs的面心立方晶体结构和纳米球形结构。此外，从场发射扫描电镜（FE-SEM）图像来看，附着在TCTF上的aass的平均厚度为88 nm。未修饰的CTF传感器灵敏度为50.97 ± 4.68 nm/RIU，涂层的TCTF灵敏度为254.42 ± 20.75 nm/RIU。换句话说，它的RI灵敏度提高了~ 400 %。5次重复测定，灵敏度波动为±3.93 nm/RIU，重复性好。20 min的稳定性测试表明，当折射率为1.33和1.39时，传感器的波长位移变化较小，为±0.362 nm，折射率为1.43时，为±0.726 nm。这些结果确立了aunss涂层TCTFs作为高性能RI传感应用的有前途的平台。

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Laser-tapered optical fibers with LSPR activation for enhanced refractive index sensing

The integration of localized surface plasmon resonance (LSPR) effects with tapered optical fibers has significantly improved refractive index (RI) sensing performance. This study introduces an optimized RI sensor using gold nanospheres (AuNSs) coated on tapered coreless termination fibers (TCTFs), which demonstrate a remarkable improvement in sensitivity. The TCTFs were optimized in terms of their taper waist diameter through the variation of CO₂ laser power. Subsequently, 11.26 nm average-sized AuNSs synthesized by citrate reduction method were strongly attached to the optimized TCTF surface via thiol-functionalization. The LSPR peak of AuNSs, recorded by ultraviolet visible spectroscopy (UV-Vis), was ∼522 nm. The face-centered cubic crystal structure and nanospherical shapes of AuNSs were respectively obtained from X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HR-TEM) data. Furthermore, from the field emission scanning electron microscopy (FE-SEM) image, the average thickness of the attached AuNSs on the TCTF was 88 nm. The sensitivity of the unmodified CTF sensor was 50.97 ± 4.68 nm/RIU and the AuNSs-coated TCTF was 254.42 ± 20.75 nm/RIU. In other words, it exhibited a ∼400 % improvement in RI sensitivity. Five repetitive measurements indicated that fluctuation of sensitivity was ±3.93 nm/RIU, indicating good repeatability. The stability test for 20 min showed that the sensor experienced small wavelength shift variations of ±0.362 nm for refractive indices of 1.33 and 1.39, and ±0.726 nm for refractive index of 1.43. These results established AuNSs-coated TCTFs as a promising platform for high-performance RI sensing applications.

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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...