Browsing by Author "Kasthuri R"

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EFFECT OF GRAPHENE ON THE PERFORMANCE OF SPR BASED FIBER OPTIC SENSOR
(Chikkanna Government Arts College, Tirupur, 2017-01-19) Santhiya Devi S; Subanya S; Kasthuri R; Rajesh K B
Conventional SPR sensors makes use of a dielectric metal configuration which finds application in the visible and near infrared region. However, it is least sensitive to mid and far infrared region. To overcome the shortcoming, graphene ribbon array are employed. Due to its unique physical, chemical and optical properties, graphene finds its application in various photonic devices and sensors. Theoretical simulation on the effect of graphene on the performance of spr based fiber optic sensor has been done. The attenuated total internal reflection method along with Krestchmann configuration has been used to analyze the sensor parameters. The influence of the number of graphene layers on the various choice of metal having particular thickness was felt in the sensor performance. The proposed optical model suits best as a bio-sensor
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.
NUMERICAL SIMULATION OF SPR BASED FIBER OPTIC GAS SENSOR USING AN ALTERNATING DIELECTRIC MULTILAYER
(Chikkanna Government Arts College, Tirupur, 2017-01-19) Kasthuri R; Sathiyapriya D; Subanya S; Rajesh K B
The technique of Surface plasmon resonance has become a highly influential method for its chemical and bio-chemical sensor applications due to its compactness and reliability. Surface plasmon resonance based fiber optic sensor with an alternating dielectric multilayer system is theoretically studied in detail. The dielectric system is constructed with alternate silica and titanium oxide layers sandwiched between the metal of study. Besides prevention of metallic layer from oxidation, it also enhances the sensitivity, tunability of the resonance wavelength region, bio-compatibility and capability of gas sensing. The effect of various design attributes on the sensitivity and detection accuracy of the sensor is studied for three different metal layers.. Based on the study, a new optical model of a fiber optic spr gas sensor is proposed.
THEORETICAL ANALYSIS OF SPR CHARACTERISTICS OF IRIDIUM
(Chikkanna Government Arts College, Tirupur, 2017-01-19) Mohanapriya S; Subanya S; Kasthuri R; Rajesh K B
The technology and applications of optical fiber have progressed very rapidly in the recent years. A detailed theoretical analysis on the performance of single and bimetal iridium layer coated on a core of an optical fiber. By varying the structure of the iridium as thin film, nanoparticle and grating, the performance of the spr based fiber optic sensor is studied and compared in detail. To study the performance of the sensor, we calculated the sensitivity, Reflection coefficient, Q factor and FWHM using Iridium with other spr active metals. Interestingly, as the thickness of the iridium layer increases, dominance of inverted surface plasmon resonance character of iridium was also observed and analyzed. At specific conditions, iridium exhibits normal as well as inverted spr characteristics. The proposed sensor finds application in various fields.
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.
THEORETICAL INVESTIGATION OF BI-CASCADED FIBRE OPTIC SURFACE PLASMON RESONANCE SENSORS
(Chikkanna Government Arts College, Tirupur, 2017-01-19) Pavithra D; Subanya S; Kasthuri R; Rajesh K B
In the present work, a bi-cascaded surface plasmon resonance based fibre optic sensor using various noble metals has been theoretically studied. The attenuated total internal reflection method along with Krestchmann configuration has been used to analyze the sensor. The proposed sensor is bi-cascaded ie., it can simultaneously detect two kinds of chemical substances by using wavelength division multiplexing technology. The sensor 1 is coated with a single layer of Au/Ag thin film of optimised thickness 50nm and the sensor 2 is coated with Pd/Pt/Ir thin films of optimised thickness 10nm 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 effects of the metals considered and its thicknesses on the transmitted spectrum of the bi-cascaded sensor have been discussed and the calculations show that the cascaded sensor produces two resonance dips with a greater difference. It provides reasonable values of performance parameters and hence finds application as a good chemical/gas/biosensor.
THEORETICAL SIMULATION OF SURFACE PLASMON RESONANCE BASED FIBRE OPTIC SENSORS USING GRAPHENE
(Bharathidasan University, 2016-03-18) Anju K K; Subanya S; Kasthuri R
Theoretical simulation on the performance of Graphene as single, double and triple layers has been studied. The attenuated total internal reflection method along with Krestchmann configuration has been used to analyze the sensor. The surface Plasmon resonance based fiber optic sensor for three, four and five layer mode (core, single/bi/tri metal layer and sample) were studied theoretically by varying the refractive index of the sample from 1.32 to 1.335 in terms of 0.005. The overall performance parameters of the proposed sensor is studied and analysed.
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.
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.