Detection Limit of Etched Fiber Bragg Grating Sensors

Shivananju, Bannur Nanjunda; Renilkumar, M.; Prashanth, Gurusiddappa R.; Asokan, S.; Varma, Manoj M.

doi:10.1109/jlt.2013.2262231

Cited by 61 publications

(44 citation statements)

References 30 publications

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“…Concerning the applications of nanostructures and nanocoatings deposited on an OFG-sensing device and used to improve the detection of not-strictly biological analytes, it is worth mentioning the layer-by-layer (LbL) deposition of self-assembled polyelectrolyte multilayers deposited on an EFBG [cationic poly-allylamine hydrochloride (PAH)/anionic poly-acrylic acid (PAA)] [37] or on an LPG (PAH/poly-sodium-p-styrenesulfonate [PSS]) [38] for the monitoring of sucrose concentrations. A thin film of mixed iron and silica nanoparticles was deposited on an LPG and used for the monitoring of corrosion and of environmental changes [39].…”

Section: How Can Nanotechnology Meet Ofg-based Sensing Platforms?mentioning

confidence: 99%

Biosensing with optical fiber gratings

et al. 2017

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Optical fiber gratings (OFGs), especially longperiod gratings (LPGs) and etched or tilted fiber Bragg gratings (FBGs), are playing an increasing role in the chemical and biochemical sensing based on the measurement of a surface refractive index (RI) change through a label-free configuration. In these devices, the electric field evanescent wave at the fiber/surrounding medium interface changes its optical properties (i.e. intensity and wavelength) as a result of the RI variation due to the interaction between a biological recognition layer deposited over the fiber and the analyte under investigation. The use of OFG-based technology platforms takes the advantages of optical fiber peculiarities, which are hardly offered by the other sensing systems, such as compactness, lightness, high compatibility with optoelectronic devices (both sources and detectors), and multiplexing and remote measurement capability as the signal is spectrally modulated. During the last decade, the growing request in practical applications pushed the technology behind the OFG-based sensors over its limits by means of the deposition of thin film overlays, nanocoatings, and nanostructures, in general. Here, we review efforts toward utilizing these nanomaterials as coatings for high-performance and low-detection limit devices. Moreover, we review the recent development in OFG-based biosensing and identify some of the key challenges for practical applications. While high-performance metrics are starting to be achieved experimentally, there are still open questions pertaining to an effective and reliable detection of small molecules, possibly up to single molecule, sensing in vivo and multi-target detection using OFG-based technology platforms.

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Section: How Can Nanotechnology Meet Ofg-based Sensing Platforms?mentioning

confidence: 99%

Biosensing with optical fiber gratings

et al. 2017

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“…To model the effect of bulk refractive index change as well as surface adsorption of molecules on the EFBG surface, we used a finite element (FEM) model, shown in Fig. 1 and described in our previous work [26]. The FEM model was created using commercially available multiphysics package COMSOL.…”

Section: A Fem Model Of Efbgmentioning

confidence: 99%

“…For bulk index sensing, refractive index resolution of has been reported by Ladicicco et al [24] and a higher sensitivity sensor with an index resolution of has been reported by Athanasios et al [25], in which the fiber was etched down to 3.4 exposing the core to the surrounding medium. We had recently done a systematic quantitative study of EFBG sensor performance for measuring surface molecular adsorption in real-time and showed that the limit of detection (LoD) of EFBGs can attain and even surpass prominent optical label-free molecular sensing techniques such as Surface Plasmon Resonance (SPR) when the fiber is etched down below 2 microns diameter [26]. In this paper, we analyze the problem of calibrating a large array of EFBG sensors for high-resolution measurement of analyte binding patterns on the functionalized sensor arrays.…”

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confidence: 99%

“…The purpose of the calibration process is to scale the data such that all sensors in spite of their sensitivity differences should yield the same molecular information. We used a finite element (FEM) numerical model of surface adsorption on the EFBG sensor [26] made using commercially available COMSOL multiphysics package to quantitatively analyze the Bragg wavelength shifts from these sensors. Although several simpler and more efficient methods such as multilayer matrix method are available [31], [32] for modelling the adsorption on EFBGs, we used COMSOL as we will be simulating multiphysics phenomena related to molecular sensing using these sensors in future work.…”

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Calibration of Etched Fiber Bragg Grating Sensor Arrays for Measurement of Molecular Surface Adsorption

Mudachathi

Shivananju

Prashanth

et al. 2013

J. Lightwave Technol.

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Etched Fiber Bragg Grating (EFBG) sensors are attractive from the point of the inherently high multiplexing ability of fiber based sensors. However, the strong dependence of the sensitivity of EFBG sensors on the fiber diameter requires robust methods for calibration when used for distributed sensing in a large array format. Using experimental data and numerical modelling, we show that knowledge of the wavelength shift during the etch process is necessary for high-fidelity calibration of EFBG arrays. However as this approach requires the monitoring of every element of the sensor array during etching, we also proposed and demonstrated a calibration scheme using data from bulk refractometry measurements conducted post-fabrication without needing any information about the etching process. Although this approach is not as precise as the first one, it may be more practical as there is no requirement to monitor each element of the sensor array. We were able to calibrate the response of the sensors to within 3% with the approach using information acquired during etching and to within 5% using the post-fabrication bulk refractometry approach in spite of the sensitivities of the array element differing by more than a factor of 4. These two approaches present a tradeoff between accuracy and practicality.Index Terms-Etched fiber Bragg grating, FBG sensor arrays, fiber array based biosensing.

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“…This increase in the sensitivity is more noticeable when the etching process evolves beyond the cladding-core boundary, however at expense of the fiber integrity and the light guiding capability. Shivananju et al [12] showed that etched Fiber Bragg Gratings (FBG) could be more effective than SPR (Surface Plasmon Resonance) based techniques, provided the etching process is developed until the final fiber radius is 2 µm or less.…”

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confidence: 99%

Etched FBG written in multimode fibers: sensing characteristics and applications in the liquid fuels sector

Corotti

Thaler

Kalinowski

et al. 2015

J. Microw. Optoelectron. Electromagn. Appl.

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Abstract-In this work, a refractometric fiber sensor for the liquid fuels sector is described. The use of etched FBGs produced in multimode fibers is proposed to overcome the drawbacks associated with sensing high refractive index samples employing fiber transducers. The transducer sensitivity can be tailored by adjusting the final diameter of the etched Bragg grating. Due to a trade-off between the signal-to-noise ratio and the sensitivity, operational parameters of the sensor must be designed to match the expected refractive index dynamic range for specific applications. and in the following years it is expected to reach an upper limit of 27.5 %. As a new technology, its production as well as quality and conformity monitoring still presents few methods and instruments to assess standards, for both production and commercialization sectors [4 -6].The biodiesel is produced by a chemical reaction known as transesterification, with the conversion of a fatty acid into an ester and generating glycerin as a by-product. Some authors [7,8] showed that it is possible to monitor the ester conversion by the determination of the sample refractive index. Such possibility instigated studies about the performance of optical fiber devices as long period gratings

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Detection Limit of Etched Fiber Bragg Grating Sensors

Cited by 61 publications

References 30 publications

Biosensing with optical fiber gratings

Biosensing with optical fiber gratings

Calibration of Etched Fiber Bragg Grating Sensor Arrays for Measurement of Molecular Surface Adsorption

Etched FBG written in multimode fibers: sensing characteristics and applications in the liquid fuels sector

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