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SPR studies on optical fiber coated with different plasmonic metals for fabrication of efficient biosensors
摘要： In the recent years, there have been numerous reports on study of Surface Plasmon Resonance (SPR) in different Plasmonic metals. Optical – fiber based SPR sensors have gained much attention over the years because of their copious advantages over conventional Prism coupled SPR sensors, including miniaturization, ability to perform remote sensing etc. In the present work, Optical – fiber based Surface Plasmon studies are performed on metal – air interface with different Plasmonic metals. Four different metals chosen for the current work are as follows: Gold (Au), Silver (Ag), Aluminum (Al) and Copper (Cu). Thermal Evaporation technique is utilized to deposit the Au, Ag, Al and Cu metal thin films. XRD, AFM and UV–Visible spectroscopy are used for the determination of the structural, morphological and optical characteristics of the deposited metal thin films. SPR transmittance curve is obtained for different metals and their observed SPR wavelength (kspr) matches very well with the reported values. The performance of these metals for their application in SPR based biosensors, was assessed in terms of the Full Width at Half Maxima (FWHM) and minimum transmitted intensity (Tmin) of their SPR transmittance curves and it was found that Ag (50 nm thickness) possesses the least FWHM whereas Au (40 nm thickness) has the lowest Tmin. Suitability of both Ag and Au is discussed for sensing applications and it was concluded that Au (40 nm thickness) is a better candidate for the realization of efficient biosensors.
关键词： SPR,Plasmonic metal,FWHM,Optical fiber,Bio sensor
更新于2025-09-23 15:19:57
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[IEEE 2018 IEEE SENSORS - New Delhi, India (2018.10.28-2018.10.31)] 2018 IEEE SENSORS - Finite Element Modelling and Computational Analysis of Mechanical Properties of Carbon Composite-Based Love Wave Sensor
摘要： Structured materials are of interest to emphasize the sensitivity of gas or bio-sensors. This work focuses on carbon-polymer composite (PEDOT:PSS-MWCNT) and additional multiwalled carbon nanotubes (MWCNT), deposited by inkjet printing on Love acoustic wave devices. This combination is studied, both with simulation based on finite element modelling and computational analysis of a reduced model, and experimental measurements. This allows for an estimation of the Young modulus of each material: 70 GPa and 150 GPa for the PEDOT:PSS-MWCNT bilayer composite material (? 450nm) and for the MWCNT bilayer on carbon composite (?140nm), respectively. The value is lower than that obtained in the literature, which has been attributed to the material porosity. An enhanced waveguiding effect is observed, which is interesting for further detection applications.
关键词： MWCNT,PEDOT:PSS,Gas sensor,FEM,SAW,Bio sensor
更新于2025-09-19 17:15:36
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D-shaped PCF sensor based on SPR for the detection of carcinogenic agents in food and cosmetics
摘要： D-Shaped PCF sensor working on the principle of Surface Plasmon Resonance is scrutinized in our work by Finite element method. Indium titanium oxide (ITO) is coated over the flat surface of the sensor and over it the analyte is placed which enhances the excitation of Plasmon in the intermediate surface which is the major part in sensing. In our work we have achieved the maximal spectral sensitivity of 50000 nm/RIU accompanied by high resolution 4x10-4 RIU, and also maximum amplitude sensitivity of 1266.67 RIU?1. We have numerically investigated the SPR sensing performance by considering the diameter of the core which can be optimized by varying the air-hole diameter and also the proposed model enables the feasibility of D-shaped PCF structure with very high sensitivity near IR region. Among the proposed SPR sensors, our sensor achieved the highest sensitivity range and it can be used for various chemical and bio-sensing applications.
关键词： D shaped PCF,Amplitude Sensitivity,Surface Plasmon Resonance,Finite element method,Bio Sensor
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE Photonics Conference (IPC) - Reston, VA, USA (2018.9.30-2018.10.4)] 2018 IEEE Photonics Conference (IPC) - Modeling and Analysis of SOI Grating Coupler for Bio-sensing Applications
摘要： This work presents, analysis of SOI optical grating structure operating at 1310 nm wavelength. Power coupling analysis between optical source and grating structure is done. The maximum power coupling efficiency of 55.2% is achieved for 500nm grating pitch having 50% duty cycly on 220nm Si-layer.
关键词： Broadband wavelength,Injection angle,Grating coupler,Multi beam,bio-sensor
更新于2025-09-05 23:14:25
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Model of GaSb-InAs p-i-n Gate All Around (GAA) BioTunnel FET (BTFET)
摘要： The paper investigates the role of hetero-Junction (HJ) p-i-n Gate All Around GAA Tunnel FET architecture for biosensing applications. The device offers better sensitivity and has been modeled in terms of various parameters such as surface potential, threshold voltage and drain current. Analytical modeling scheme relates to the exact resultant solution of two-dimensional Poisson equation. The shift in the threshold voltage has been considered as the sensing parameter to detect the sensitivity when the biomolecules are immobilized in the cavity region.
关键词： Gate all around tunnel FET (GAA-TFET),Model,Bio-Sensor,Hetero Junction (HJ),Dielectric Modulation
更新于2025-09-04 15:30:14