Characterisation of nano-thin film GO/TiO2 layers for Kretschmann-based surface plasmon resonance visible sensing using FDTD method

IF 0.7 4区物理与天体物理 Q4 OPTICS

Optica Applicata Pub Date : 2021-01-01 DOI:10.37190/oa210409

N. B. Khairulazdan, R. Mohamed, D. Berhanuddin, P. Menon

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引用次数: 0

Abstract

Kretschmann-based surface plasmon resonance (K-SPR) is suitable for biomolecular sensing which provides label-free and quick detection results with real-time analysis. In this work, we have investigated the effect of graphene oxide (GO) with titanium dioxide (TiO2) thin films that are placed in hybrid above metal layers such as gold (Au), silver (Ag) and copper (Cu) with the presence of chromium (Cr) as an adhesive layer. The thickness of the Au, Ag and Cu metal thin films were optimized to 40, 30 and 30 nm, respectively, with a fixed thickness of GO of 2 nm and TiO2 of 1.9 nm. The sensing was evaluated for SPR excitation at three different visible wavelengths of 633, 670 and 785 nm. The performance of sensing was analyzed based on the reflectance intensity and full-width at half-maximum (FWHM) of the spectrum using the finite-difference time-domain (FDTD) method. The sensitivity was calculated for analyte sensing in dielectric mediums of air versus water. The sensitivity increment percentage (%ΔS) was determined when comparing analyte detection using Cr/metal and Cr/metal/GO/TiO2 sensor structures. The highest sensitivity of 94.51 deg/RIU was achieved for Cr/Cu/GO/TiO2 K-SPR sensor at 633 nm wavelength.

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kretschmann基表面等离子体共振可见光传感用纳米薄膜GO/TiO2层的FDTD表征

基于kretschmann的表面等离子体共振(K-SPR)技术适用于生物分子传感，可提供无标记、快速的检测结果和实时分析。在这项工作中，我们研究了氧化石墨烯(GO)与二氧化钛(TiO2)薄膜的效果，这些薄膜被放置在金(Au)、银(Ag)和铜(Cu)等金属层的杂化层上，铬(Cr)作为粘合层存在。Au、Ag和Cu金属薄膜的厚度分别优化为40、30和30 nm，其中GO的固定厚度为2 nm, TiO2的固定厚度为1.9 nm。在633、670和785 nm三种不同的可见光波长下对SPR激发进行了检测。利用时域有限差分(FDTD)方法分析了基于光谱反射强度和半最大值全宽度的传感性能。计算了分析物在空气和水介质中的灵敏度。通过比较Cr/metal和Cr/metal/GO/TiO2传感器结构对分析物的检测，确定灵敏度增量百分比(%ΔS)。在633 nm波长处，Cr/Cu/GO/TiO2 K-SPR传感器的灵敏度最高，为94.51°/RIU。

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

Optica Applicata 物理-光学

CiteScore

1.00

自引率

16.70%

发文量

审稿时长

4 months

期刊介绍： Acoustooptics, atmospheric and ocean optics, atomic and molecular optics, coherence and statistical optics, biooptics, colorimetry, diffraction and gratings, ellipsometry and polarimetry, fiber optics and optical communication, Fourier optics, holography, integrated optics, lasers and their applications, light detectors, light and electron beams, light sources, liquid crystals, medical optics, metamaterials, microoptics, nonlinear optics, optical and electron microscopy, optical computing, optical design and fabrication, optical imaging, optical instrumentation, optical materials, optical measurements, optical modulation, optical properties of solids and thin films, optical sensing, optical systems and their elements, optical trapping, optometry, photoelasticity, photonic crystals, photonic crystal fibers, photonic devices, physical optics, quantum optics, slow and fast light, spectroscopy, storage and processing of optical information, ultrafast optics.