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1.
利用光子晶体光纤结构的灵活性和性能的优越性, 设计了一种基于D形光子晶体光纤的折射率和温度传感器. 在D形光子晶体光纤表面抛磨并镀上金纳米薄膜, 作为表面等离子体共振传感通道用来测量液体折射率; 在包层的一个空气孔中填充温敏液体甲苯, 作为定向耦合通道实现对温度的测量. 进一步的数值计算发现, 基于定向耦合效应的温度传感和基于表面等离子体共振的折射率传感相互独立, D形光子晶体光纤同时进行折射率和温度传感检测. 在各向异性的完美匹配层边界条件下利用全矢量有限元法对该传感器特性进行了数值研究, 发现D形光子晶体光纤的空气孔直径决定了定向耦合吸收峰的中心波长和温度传感的灵敏度, 金薄膜的厚度和D形结构的抛磨深度仅影响表面等离子体共振峰的相对强度. 结果表明: 该传感器在-10–80 ℃的温度范围内具有11.6 nm/℃的温度灵敏度, 在1.34–1.44折射率范围内折射率灵敏度最高可达26000 nm/RIU. 相似文献
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Modeling of a miniaturized fiber optic sensor based on surface plasmon resonance utilizing a broad band diffuse source is
presented. Attenuated total internal reflection with Kretschmann configuration is the basis of the theoretical model. For
simulation both meridional and skew rays are considered. The performance of the sensor is evaluated in terms of sensitivity,
detection accuracy and signal to noise ratio. Effects of the numerical aperture of the fiber, core diameter and length of
the sensing region on the performance parameters of the sensor are studied. The results are obtained for gold and silver metallic
layer on the core of the fiber. The theoretical results obtained are compared with SPR based fiber optic sensor utilizing
focused beam on the end face of the fiber from a collimated source. The advantages of using broadband LED (diffuse source)
source for launching light in the fiber are the miniaturization, compactness and low cost of the sensor. 相似文献
3.
光纤表面等离子体共振传感器在高灵敏度传感和在线实时监测等领域具有重要意义. 设计了一种六重准晶体结构环形通道光纤表面等离子体共振传感器, 基于有限元法对该传感器的传感特性进行了数值模拟. 研究了光纤各结构参量对传感器特性的影响规律. 研究结果表明: 待测液折射率的有效监测范围为1.25–1.331, 最高灵敏度可达26400 nm·RIU-1, 传感器具有损耗谱杂峰少、探测范围广、灵敏度高、设计灵活性高和光路可弯曲等特点, 在生化检测、公共安全、环境污染监测以及高灵敏度传感等领域具有广泛的应用前景. 相似文献
4.
The relationships of the resonant wavelength of optical fiber surface plasmon resonance (SPR) sensors to the modulation layer refractive index, thickness and the refractive index of the bulk medium are obtained by using theoretical calculation model of optical fiber SPR sensors under certain conditions, which indicates that resonant wavelength of the sensors is approximately linear with modulation layer thickness. Based on the linear relationship, multiple SPR sensors with different resonant wavelengths can be fabricated in a single optical fiber named as distributed optical fiber surface plasmon resonance sensors (DOFSPRSs).Experimental results are presented, showing that it is practical to fabricate more than one SPR sensors in a single optical fiber. 相似文献
5.
A novel analysis based on surface plasmon resonance (SPR) with a side-polished multimode fiber and a white-light (halogen light) source is presented. The sensing system is a multimode optical fiber in which half of the core has been polished away and a 40 nm gold layer is deposited on to the polished surface by dc sputter. The SPR dip in the optical spectrum is investigated with an optical spectrum analyzer (OSA). In our SPR fiber sensor, the use of liquids with different refractive indices leads to a shift in the spectral dip in the SPR curve. The cross point (CP) of the two SPR spectra obtained from the refractive-index liquid and the deionized water measurements was observed with the OSA. The CP is shifted sensitively in wavelength from 630 to 1300 nm relative to a change in the refractive index of the liquid from 1.34 to 1.46. High sensitivities of 1.9 x 10(-6) refractive-index units (RIUs) in the range of the refractive index of the liquid from 1.40 to 1.44 of 5.7 x 10(-7) RIUs above the value of 1.44 are proposed and demonstrated in our novel SPR analysis. 相似文献
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An extremely sensitive surface plasmon resonance based fiber optic sensor with indium nitride (InN) layer coated on the core of the optical fiber is theoretically analyzed. The proposed sensor exhibits high sensitivity in the near infrared region of spectrum. The optimized value of thickness of InN layer is found to be 70 nm. Possessing high sensitivity of 4493 nm/RIU, the 70 nm thick InN layer based fiber optic SPR sensor illustrates good sensing behavior. 相似文献
8.
We report a systematic, experimental, and theoretical investigation on the surface plasmon resonance (SPR) sensing using optical disks with different track pitches, including Blu-ray disk (BD), digital versatile disk (DVD), and compact disk (CD). Optical reflection measurements indicate that CD and DVD exhibit much higher SPR sensitivity than BD. Both experiments and finite-difference time-domain simulations reveal that the SPR sensitivity is significantly affected by the diffraction order of the SPR peaks and higher diffraction order results in lower sensitivity. Numerical simulations also show that very high sensitivity (~1600 nm per refractive index unit) is achievable by CDs. 相似文献
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In this paper an optical surface plasmon resonance (SPR) sensor with metamaterial for four and five layered structure is studied. The numerical results presented in this paper leads to a significant properties of metamaterials in sensing field. Computed results of SPR sensors using metamaterial are compared with conventional optical SPR sensors for four and five layered structure. It is seen that wider dynamic range or effective range of measurable refractive index increases when metamaterial layer is used. It is also verified that SPR sensor with metamaterial layer can dramatically enhance the resolution and reduce the reflectivity compared with conventional SPR. Validity of the magnetic field results is proved on the basis of smooth match of the fields in the different layers of the proposed optical SPR sensor. 相似文献
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A highly sensitive surface plasmon resonance (SPR) based fiber optic sensor with indium oxide (In2O3) layer coated on the core of the optical fiber is presented and theoretically analyzed. The sensitivity of the SPR based fiber optic sensor has been evaluated numerically. It is shown that the proposed SPR based fiber optic sensor with In2O3 layer possesses high sensitivity in the near infrared region of spectrum, which needs attention to many environmental and security applications and offers more accurate and highly reproducible measurements. In addition, the sensitivity of the SPR based fiber optic sensor decreases with the increase in the thickness of In2O3 layer. With sensitivity as high as 4600 nm/RIU, the 170 nm thick In2O3 layer based fiber optic SPR sensor demonstrates better performance. 相似文献
15.
NAVNEET K SHARMA 《Pramana》2012,78(3):417-427
The capability of various metals used in optical fibre-based surface plasmon resonance (SPR) sensing is studied theoretically.
Four metals, gold (Au), silver (Ag), copper (Cu) and aluminium (Al) are considered for the present study. The performance
of the optical fibre-based SPR sensor with four different metals is obtained numerically and compared in detail. The performance
of optical fibre-based SPR sensor has been analysed in terms of sensitivity, signal-to-noise (SNR) ratio and quality parameter.
It is found that the performance of optical fibre-based SPR sensor with Au metal is better than that of the other three metals.
The sensitivity of the optical fibre-based SPR sensor with 50 nm thick and 10 mm long Au metal film of exposed sensing region
is 2.373 μm/RIU with good linearity, SNR is 0.724 and quality parameter is 48.281 RIU − 1. The thickness of the metal film and the length of the exposed sensing region of the optical fibre-based SPR sensor for each
metal are also optimized. 相似文献
16.
Numerical study of a highly sensitive surface plasmon resonance sensor based on circular-lattice holey fiber 下载免费PDF全文
Jian-Fei Liao 《中国物理 B》2022,31(6):60701-060701
A new design of surface plasmon resonance (SPR) sensor employing circular-lattice holey fiber to achieve high-sensitivity detection is proposed. The sensing performance of the proposed sensor is numerically investigated and the results indicate that our proposed SPR sensor can be applied to the near-mid infrared detection. Moreover, the maximum wavelength sensitivity of our proposed sensor can reach as high as 1.76×104 nm/refractive index unit (RIU) and the maximum wavelength interrogation resolution can be up to 5.68×10-6 RIU when the refractive index (RI) of analyte lies in (1.31, 1.36). Thanks to its excellent sensing performance, our proposed SPR sensor will have great potential applications for biological analytes detection, food safety control, bio-molecules detection and so on. 相似文献
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We present and numerically characterize a dual channel surface plasmon resonance (SPR) sensor based on a D-shaped fiber with a central hole for silicone oil detections. The proposed design incorporates two metalized channels to facilitate the simultaneous detection of one group of silicone oils, which can consist of two different species. It has been demonstrated that the p-polarized input light can induce two peaks among surface plasmon resonance places, which come from the coupling between the core-guided mode and the fundamental surface plasmon polariton (SPP) modes at the D-shaped surface and around the central hole surface. However, the s-polarized input light can only induce one peak among surface plasmon resonance places, which comes from the coupling between the core-guided mode and the fundamental SPP mode around the central hole surface. The simulation results show that the characteristic responses of two channels independently correspond to the refractive index variations in the silicone oils with which they are in contact. A maximum sensitivity of 3500 nm/RIU (refractive index unit) and 4400 nm/RIU are achieved for channel A and B, respectively. This kind of sensor structure and polarization related demodulation method is promising in the simultaneous multi-analytes sensing applications in the future. 相似文献
18.
J.-l. Kou Z.-d. Huang G. Zhu F. Xu Y.-q. Lu 《Applied physics. B, Lasers and optics》2011,102(3):615-619
D-shaped optical fiber microwire (OFM) devices are investigated theoretically. They can be obtained by wrapping OFMs on removable rods or laying the OFMs on disposable substrates. Optical wave guiding properties of these devices are discussed with numerical simulations. Dispersion properties of OFMs with different radii are studied as well. A grating-based D-shaped OFM is proposed for sensing applications. The corresponding sensitivity could reach 1100 nm/RIU (refractive index unit) due to its large outside evanescent field. 相似文献
19.
为了改进SPR传感器灵敏度低、稳定性差、测量范围窄等问题,基于光的衰减全反射理论设计了一种SPR传感装置。利用FDTD计算机软件分析得到:设计的结构分子层和金属薄膜之间的界面磁场强度得到极大地提高,测量精度有了显著的改进;很大一部分倏逝场能量集中在表面等离子共振区,倏逝波的强度非常强。 相似文献
20.
Mei Yang Shun Long Weiheng Zhu Yunhan Luo Peiling Mao Jieyuan Tang Junbin Fang Jianhui Yu Jun Zhang Huihui Lu Zhe Chen 《Optical and Quantum Electronics》2017,49(1):31
In this paper, a surface plasmon resonance fiber sensor based on gold nano-column array instead of gold film is designed and optimized. The finite element method is used to optimize the diameter of the nano-gold column under the consideration of figure of merit, which relates to the sensitivity, resonance wavelength and resonance intensity. The optimized sensor has 70 nm gold nano-column coated on a side polished single mode fiber. The results show that the average sensitivity reaches 5318 nm/RIU when the environmental refractive index changing from 1.33 to 1.39 RIU, which is much higher than those in the conventional surface plasmon resonance structure. The optimizes design will serve a vital foundation to the fabrication of high performance fiber optic surface plasmon resonance sensors based on nano metallic structure. 相似文献