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Subject: search.filters.subject.fiber optic sensors

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    HIGH PERFORMANCE SPR BASED FIBER OPTIC SENSORS USING MXENE
    (Chikkanna Govt. Arts College, Tiruppur, 2020-03-05) Balamurugeshwari A; Nivethitha P.V; Subanya S; Rajesh K.B
    In the last few decades, Surface Plasmon Resonance based optical sensors has created a niche for itself in the field of bio, chemical and gas sensing applications due to their surprising superior characteristics such as its high sensitivity, reliability, real time sensing ability, compactness and flexibility. Recently a new family of 2d transition metal carbide/ nitride materials known as MXene has drawn increased attention due to their exceptional properties like excellent thermal stability, easily tunable structure, large interlying surface, high electrical conductivity and large surface area. A detailed analysis on the performance parameters of SPR based fiber optic sensors having a Four layer model - Core/metal/Mxene/Sensing medium is performed. Kretschmann configuration and the N layer matrix model has been employed for the performance study and a novel SPR sensor based on Au/Ag/Co/Ni with MXene layers is theoretically presented. The thickness of the metal layer, Mxene and the RI of the multi layers have been properly chosen. Enhanced sensitivity is observed in the MXene based Sensor compared to the bare metal based SPR sensor as well as the conventional metal film sensors. The other sensor parameters such as the Quality Factor, Detection Accuracy, Signal to Noise ratio has also shown desired values. Owing to their unique properties, MXene has demonstrated promising nature for various applications such as energy storage, chemical, photo and electrocatalyst, photothermal therapy, gas sensing etc.
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    NUMERICAL SIMULATION ON THE PERFORMANCE OF SPR BASED FIBER OPTIC SENSOR USING NANOCOMPOSITES
    (Chikkanna Govt. Arts College, Tiruppur, 2019-02-01) Abiramavalli T; Kaviyarasi K; Subanya S; Rajesh K B
    In the last few decades, Surface Plasmon Resonance technique has become highly influential for its chemical, bio-chemical and gas sensing applications due to its compactness, flexibility and reliability. Transparent conducting oxide like In2O3 are of immense interest due to their good electrical conductivity property and high transparency in the visible and infra red region. A study on the performance of spr based fiber optic sensor with nanocomposites has been carried out numerically and investigated. Nanocomposites comprising of Co and Ni nanoparticles with their varying volume fractions embedded in the host dielectric matrices of Indium Oxide are considered for the study. The metal nanoparticles exhibit tremendous optical properties originating from the surface plasmons and hence show better sensing performance than materials in the macro or large scales. By varying the thickness of the nanocomposite for various volume fractions, the performance parameters such as FWHM, sensitivity and Q-factor of the sensor were studied and analyzed. The sensitivity of Ni/In2O3 nanocomposites based sensor shows better performance for all thicknesses with any volume fraction compared to Co/In2O3 nanocomposites. It is observed that the sensitivity of the sensor increases with increase in both thickness of the nanocomposites and the volume fraction of metal nanoparticles. The usage of Co and Ni in the place of noble metals has curtailed the cost of the spr sensor.
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    THEORETICAL STUDY OF SPR BASED FIBER OPTIC SENSOR USING AU/AG NANOCOMPOSITES WITH VARIOUS METALS
    (Chikkanna Government Arts College, Tirupur, 2017-01-19) Sangeetha A; Subanya S; Kasthuri R; Rajesh K B
    SPR based fiber optic sensor with Au and Ag nanocomposites with Cu, Al, Ir, Pt and Pd is theoretically studied. The metal nanoparticles exhibit better sensing performance than materials in the macro or large scales and reveal tremendous optical properties because of the collective excitation of conduction electrons. Nanocomposites consisting of Cu, Al, Ir, Pt and Pd nanoparticle with their varying volume fraction embedded in the host dielectric matrices of Au and Ag are considered for the study. By varying the thickness of the nanocomposite layer for various volume fraction, the performance parameters such as FWHM, sensitivity and Q-factor of the proposed sensor were studied and analyzed. The effect of operating wavelength along with the size and volume fraction of nanocomposite is studied on sensor's performance. Further for a fixed nanocomposite thickness and fixed volume fraction of metal nanoparticle, the sensor demonstrates highest sensitivity for Au-Pd nanocomposite than other combinations.
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    NUMERICAL SIMULATION OF BI-CASCADED FIBRE OPTIC SURFACE PLASMON RESONANCE SENSORS
    (Bharathidasan University, 2016-03-18) Pavithra D; Subanya S; Kasthuri R
    In the present work, numerical simulation of a bi-cascaded surface plasmon resonance based fibre optic sensor using various noble metals has been carried out. The attenuated total internal reflection method along with Krestchmann configuration has been used to analyze the sensor. The thickness of the metal layer, its dielectric constants and the thickness, length and refractive index of the sensing layer is properly chosen and the sensitivity evaluation is done and the various sensor parameters have been optimized. The proposed sensor is bi-cascaded ie., it can simultaneously detect two kinds of substances. It provides reasonable values of performance parameters and hence finds application as a good chemical/gas/biosensor.
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    THEORETICAL STUDY ON THE PERFORMANCE OF SPR BASED FIBER OPTIC SENSORS USING METAL LAYERS WITH AG/METAL NANOCOMPOSITES
    (Bharathidasan University, 2016-03-18) Divya M; Subanya S; Kasthuri R
    A theoretical study on the performance of various noble metals with Ag nanocomposites is performed. A thin Ag/metal nanocomposite layer of various values of f(fraction) is coated over the core. The overall performance of the proposed sensor were studied by altering the thickness of the layer considered. The overall performance of the sensor for the optimized thickness(25nm) is studied in terms of FWHM , sensitivity, Q factor and SNR ratio. On comparing the results obtained, the best nanocomposite combination suitable for sensor applications has been predicted.
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    THEORETICAL ANALYSIS ON THE PERFORMANCE OF SPR BASED FIBER OPTIC SENSORS USING METAL LAYERS WITH BIMETALLIC NANOCOMPOSITES
    (Bharathidasan University, 2016-03-18) Anusha V; Subanya S; Kasthuri R
    We theoretically studied the performance of various noble metals with Au nanocomposites. A thin nanocomposite layer of the required composition is coated over the core. By varying the thickness of the nanocomposite layer, the performance parameters of the proposed sensor were studied and analyzed. The thickness of the layer(25nm) is optimized for various proportion of x. The overall performance of the sensor is studied in terms of FWHM , sensitivity, Q factor and SNR ratio. On comparing the results obtained, the best nanocomposite suitable for sensor applications has been predicted.