Sensitivity enhancement of a surface plasmon resonance based fibre optic refractive index sensor utilizing an additional layer of oxides

Singh, Sadhna; Mishra, Satyendra; Gupta, Banshi D.

doi:10.1016/j.sna.2013.01.012

Cited by 134 publications

(50 citation statements)

References 18 publications

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“…Optical fiber refractometers have attracted widespread attention in the past decades due to many desirable advantages such as the small size, compact structure, high flexibility, immunity to electromagnetic interference, corrosion resistance, and the capacity for in situ and multiplexed operation. Various optical fiber refractometers have been developed including tapered fiber structures [1], optical fiber surface plasmon resonance (SPR) devices [2][3], fiber Bragg gratings (FBGs) [4][5], titled fiber Bragg gratings (TFBGs) [6], long-period gratings (LPGs) [7][8], optical fiber modal interferometers (MIs) [9][10], and fiber Fabry-Perot interferometers (FPIs) [11][12][13][14][15][16]. Among them, the fiber FPIs have advantages of compact probe structure, large measurement range, linear response, low temperature cross-sensitivity, and convenient reflection mode for detection, which make them particularly attractive for RI measurement.…”

Section: Introductionmentioning

confidence: 99%

HCPCF-based in-line fiber Fabry-Perot refractometer and high sensitivity signal processing method

et al. 2017

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An in-line fiber Fabry-Perot interferometer (FPI) based on the hollow-core photonic crystal fiber (HCPCF) for refractive index (RI) measurement is proposed in this paper. The FPI is formed by splicing both ends of a short section of the HCPCF to single mode fibers (SMFs) and cleaving the SMF pigtail to a proper length. The RI response of the sensor is analyzed theoretically and demonstrated experimentally. The results show that the FPI sensor has linear response to external RI and good repeatability. The sensitivity calculated from the maximum fringe contrast is -136 dB/RIU. A new spectrum differential integration (SDI) method for signal processing is also presented in this study. In this method, the RI is obtained from the integrated intensity of the absolute difference between the interference spectrum and its smoothed spectrum. The results show that the sensitivity obtained from the integrated intensity is about -1.34× 10 5 dB/RIU. Compared with the maximum fringe contrast method, the new SDI method can provide the higher sensitivity, better linearity, improved reliability, and accuracy, and it's also convenient for automatic and fast signal processing in real-time monitoring of RI.

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Section: Introductionmentioning

confidence: 99%

HCPCF-based in-line fiber Fabry-Perot refractometer and high sensitivity signal processing method

et al. 2017

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“…The decaying evanescent field away from the interface and propagating along the metal-dielectric interface excites the surface plasmons when it possesses the same wave vector as that of surface plasmons [22][23][24][25][26][27][28][29][30]. Tremendous amount of work has been carried out on the SPR based fiber optic sensors for the detection of various analytes due to large number of advantages like high sensitivity, low cost, miniaturized probe, real time monitoring and capability of remote sensing [22][23][24][27][28][29]. In the case of SPR, it is necessary for the thin film coated over the substrate to have its real part of permittivity to be negative and it needs TM polarized light for its generation [31].…”

Section: Introductionmentioning

confidence: 99%

Fiber optic hydrogen sulfide gas sensors utilizing ZnO thin film/ZnO nanoparticles: A comparison of surface plasmon resonance and lossy mode resonance

Usha

Mishra

Gupta

2015

Sensors and Actuators B: Chemical

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146

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“…Silver has an additional disadvantage that it gets oxidized easily and hence affects the performance of the sensor. The performance of the plasmonic sensors have been improved by the use of conducting metal oxides (CMOs) such as ITO, TiO 2 , SnO 2 and ZnO in coordination with these metals [6]- [8]. An ultrathin layer of high refractive index material such as CMO or silicon over metal layer improves the sensing performance of SPR based devices [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Bimetallic Layer With Zinc Oxide for SPR-Based Fiber Optic Sensor

Tabassum

Gupta

2015

J. Lightwave Technol.

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We present an efficient fiber optic SPR sensor consisting of bimetallic layers of silver (Ag) and gold (Au) in coordination with zinc oxide (ZnO) for refractive-index sensing in spectral mode. The performance of the sensor is explored in terms of electric field intensity, sensitivity, and the figure of merit theoretically as well as experimentally. Four kinds of sensors with layers of Ag/ZnO, Au/ZnO, Au/Ag/ZnO, and Ag/Au/ZnO over an unclad core of the fiber are studied. For simulation, two-dimensional multilayer matrix method along with geometrical optics is used. It is found that the sensor having layers of Ag/Au/ZnO with optimized thicknesses possesses maximum electric field intensity at the interface, large shift in the resonance wavelength, sharp SPR dip, and high value of the figure of merit. In addition, the additional layers of Au and ZnO can also be used for the tuning of resonance wavelength in the visible region of the electromagnetic spectrum and for the protection of Ag layer from oxidation and; hence, can improve the durability of the sensor. Further, ZnO layer can also be used to sense some of the gases.Index Terms-Bimetallic layer, figure of merit, optical fiber sensor, refractive index, sensitivity, surface plasmon resonance.

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Sensitivity enhancement of a surface plasmon resonance based fibre optic refractive index sensor utilizing an additional layer of oxides

Cited by 134 publications

References 18 publications

HCPCF-based in-line fiber Fabry-Perot refractometer and high sensitivity signal processing method

HCPCF-based in-line fiber Fabry-Perot refractometer and high sensitivity signal processing method

Fiber optic hydrogen sulfide gas sensors utilizing ZnO thin film/ZnO nanoparticles: A comparison of surface plasmon resonance and lossy mode resonance

Performance Analysis of Bimetallic Layer With Zinc Oxide for SPR-Based Fiber Optic Sensor

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