Browsing by Author "Kaviyarasi K"

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GRAPHENE BASED SPR BIOSENSOR FOR SENSITIVITY EVALUATION
(Chikkanna Govt. Arts College, Tiruppur, 2019-02-01) Kaviyarasi K; Abiramavalli T; Subanya S; Rajesh K B
In the recent years, the application of spr based fibre optic sensors have progressed very rapidly. Due to the increase in diseases and diagnotics, the urge for bio sensing applications have drawn the attention of researchers. A detailed numerical analysis on the performance parameter of an optical fibre based SPR sensors with Graphene layers over four different metals Pt/Au/Ag/Cu have been studied. Graphene not only helps in the adsorption of biomolecules due to pi-pi stacking interaction but also prevents metal oxidation. 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. The inclusion of Graphene layer is found to improve the sensitivity of the sensor. The attenuated total internal reflection method along with Krestchmann configuration has been employed for the evaluation. The effects of the metal structures considered and its thicknesses on the transmitted spectrum of the proposed sensor is analysed. Amongst the various chosen combinations, the proposed optimized Platinum Graphene coated SPR sensor demonstrates higher sensitivity than the previously reported spr sensors. The proposed configuration will surely be a promising candidate for high performance bio-sensing applications.
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.
SURFACE PLASMON RESONANCE BASED FIBRE OPTIC SENSORS FOR SENSITIVITY EVALUATION
(PSGR Krishnammal College for Women, 2019-01-21) Abiramavalli T; Kaviyarasi K; Subanya S; Rajesh K B
The technique of Surface plasmon resonance has become a highly influential method for its chemical, bio-chemical and gas sensing applications due to its compactness, flexibility and reliability. Recent reports convey that Surface Plasmon Resonance has also been involved in the energy conversion of solar energy harvesting with the application of metamaterials. Surface Plasmon resonance imaging involves the detection of material properties like density, temperature, concentration, refractive index measurement under various environmental conditions. A detailed numerical analysis on the performance parameter of an optical fibre based SPR sensors with Graphene layers over four different metals Pt/Au/Ag/Cu have been studied. The inclusion of Graphene layer is found to improve the sensitivity of 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. The attenuated total internal reflection method along with Krestchmann configuration has been employed for the evaluation. The effects of the metal structures considered and its thicknesses on the transmitted spectrum of the proposed sensor is analysed. Amongst the various chosen combinations, the proposed optimized Platinum Graphene coated SPR sensor shows greater sensitivity than the previously reported spr sensors.