Browsing by Author "Pavithra D"

Now showing 1 - 3 of 3

A COMPARATIVE STUDY ON THE PERFORMANCE OF SPR BASED CONVENTIONAL AND NANO-PLASMONIC FIBER OPTIC SENSORS
(Bannari Amman Institute of Technology, 2017-08) Subanya S; Pavithra D; 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. A detailed analysis on the performance parameters of SPR based fiber optic sensors having different bimetallic configurations is performed. Two different sensor structures are considered for the study - One having the arrangement consisting of thin layers of Au/Ag with Pd and the other having an alloy layer formed of Au/Ag and Pd nanoparticles. 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 used to analyze the sensor parameters. The effects of the metal structures considered and its thicknesses on the transmitted spectrum of the proposed sensor is analysed and the best configuration is predicted. The proposed optical model may find its application as a gas 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.
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.