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Subject: search.filters.subject.Full width half maxima (FWHM)

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    SPR BASED BIO SENSORS USING BLACK PHOSPHORUS - A BOON TO BIOMEDICAL APPLICATIONS
    (Chikkanna Govt. Arts College, Tiruppur, 2020-03-05) Deepapriya G.S; Nivethitha P.V; Subanya S; Rajesh K.B
    The recent attention of plasmonic research has turned its focus towards the field of biomedical applications, due to the excitingly appreciable optical, electronic, chemical, thermal and mechanical properties of the 2D materials. Though these materials exhibited good sensing performance, there existed certain shortcomings like the lack of bandgap in graphene, low carrier mobility of TMDCs which hindered their usage in bio-sensing applications leading to the search for a new 2D material with desirable properties for improved sensor parameters. Black phosphorus (BP), an emerging two-dimensional (2D) material has appreciably unique physical, chemical, electronic and optical properties like direct band gap, smaller work function, high charge carrier mobility, better binding of molecules on sensor surface, high surface to volume ratio, above all its biodegradability and negligible toxicity in the biological environment which keeps it par from the other available 2D materials. This has aroused more and more research interest on the biomedical applications of BP. A detailed numerical analysis on the performance parameter of an optical fibre based SPR sensors with BP layers over spr active metals Au/Ag/Co/Ni/Cu have been studied. The parameters such as the thickness of the metal and the BP layer, its dielectric constants and refractive index of the sensing layer is properly chosen and sensitivity evaluation is performed in terms of its FWHM, Sensitivity, Quality Factor and Detection Accuracy. A noticeably high improvement is witnessed in Sensitivity and the other parameters due to the presence of the BP layers. The reason for the enhancement in sensitivity is due to the better binding of biomolecules. The attenuated total internal reflection method along with Krestchmann configuration has been employed for the evaluation of parameters. The effects of the metal structures considered and its thicknesses on the transmitted spectrum of the proposed sensor is analysed by transfer matrix method. The proposed configuration will surely be a promising candidate for high performance bio-sensing applications.
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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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    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.