IDR @ IIT Bhubaneswar
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Item On the electric field enhancement and performance of SPR gas sensor based on graphene for visible and near infrared(2015) Maharana P.K.; Jha R.; Padhy P.We propose a high performance surface plasmon resonance (SPR) affinity gas sensor based on graphene on Ag in visible and near infrared. Proposed sensor configuration has been optimized for maximum surface plasmon field at the sensing layer interface. The field intensity enhancement factor at sensing layer interface is found to be higher than that of silicon over layer on Ag thereby increasing the imaging sensitivity by 340%, 120% and 82% and detection accuracy by 440%, 150% and 100% as compared to Si on Ag configuration at ? = 653 nm, ? = 850 nm and ? = 1000 nm respectively. The performance of the sensor is found to be high over a broad refractive index range (1.0000-1.0008) of gaseous analyte with sensor resolution of 8 � 10-5 RIU and 2 � 10-5 RIU at ? = 653 nm and ? = 1000 nm respectively. We believe the proposed SPR based gas sensor configuration will open a new route for efficient gas sensing by riding on the advantage of graphene and latest nanofabrication techniques. � 2014 Elsevier B.V.Item Graphene-Based Conducting Metal Oxide Coated D-Shaped Optical Fiber SPR Sensor(2015) Patnaik A.; Senthilnathan K.; Jha R.We report a graphene-based indium tin oxide coated surface plasmon resonance sensor built on a D-shaped optical fiber for near infrared. Different parameters of the proposed sensor have been optimized to obtain a maximal phase matching between the core guided mode and the plasmon mode using finite element method. Wavelength sensitivity of the proposed structure is as high as 5700 nm/RIU with a maximum resolution of 1.754 � 10-5 RIU. The proposed sensor can also be used for bio layer thickness monitoring with a maximum resolution of 62.5 pm in wavelength interrogation. � 2015 IEEE.Item Sensitivity enhancement by air mediated graphene multilayer based surface plasmon resonance biosensor for near infrared(2014) Maharana P.K.; Jha R.; Palei S.Air mediated surface plasmon resonance sensor at near infrared frequency for sensitivity enhancement has been proposed. The proposed sensor utilizes the advantage of air gap between chalcogenide prism and gold film and high adsorption efficiency of graphene for enhancement of sensitivity. The thickness of air and gold film has been optimized for multiple wavelengths. Based on angular interrogation, the sensitivity of the proposed sensor can be tuned by changing the wavelength of operation in near IR and by judiciously selecting number of graphene layer. The sensitivity of the proposed sensor is 43.18 /RIU for 10 graphene layer at 700 nm where as at 1000 nm, the sensitivity is 36.14 /RIU for same number of graphene layer. We found that the sensitivity of the sensor increases linearly with sensing layer refractive index and number of graphene layer at a given wavelength. Also, we found that the detection accuracy of the proposed sensor in near IR increases by more than 290% for L = 10 as compared to conventional SPR sensor. We believe that the proposed sensor could potentially open a new possibility for high performance SPR sensing. � 2013 Elsevier B.V. All rights reserved.Item On the Performance of Highly Sensitive and Accurate Graphene-on-Aluminum and Silicon-Based SPR Biosensor for Visible and Near Infrared(2014) Maharana P.K.; Srivastava T.; Jha R.We demonstrate the numerical analysis of surface plasmon resonance biosensor based on graphene on aluminum and silicon. Employing matrix method, it is found that the proposed sensor exhibits high imaging sensitivity ?400 RIU?1 to 550 RIU?1 in a large dynamic range from visible to near IR region. It is observed that the application of monolayer or bilayer graphene over aluminum not only protects it from oxidation but also enhances the adsorption of biomolecules, which results in the detection of large refractive indices ranging from aqueous solution to biomolecules (refractive index 1.330 to 1.480) with overall high performance in terms of imaging sensitivity and detection accuracy. � 2014, Springer Science+Business Media New York.Item On the field enhancement and performance of an ultra-stable SPR biosensor based on graphene(2013) Maharana P.K.; Padhy P.; Jha R.The effect of graphene on the electric field enhancement and performance of SPR-based sensor has been proposed and compared with Ag-Au bimetallic configuration. We found that a monolayer of graphene on Ag not only addresses the oxidation problem of Ag, but it also shows >30% field enhancement as compared with the widely reported Ag-Au bimetallic combination. Detailed calculations and simulations show that the proposed graphene-based sensor has >22% higher sensitivity and >38% narrower full-width at half-maximum than bimetallic. In addition, the better biomolecules adhesion due to graphene because of ?-stacking interaction may open a new window for ultra-stable high performance biosensors for real time bimolecular interactions. � 1989-2012 IEEE.Item Chalcogenide prism and graphene multilayer based surface plasmon resonance affinity biosensor for high performance(2012) Maharana P.K.; Jha R.Surface plasmon resonance based affinity biosensor comprising of 2S2G (Ge 20Ga 5Sb 10S 65) chalcogenide prism, graphene-multilayer and gold as a plasmon active metal is proposed for sensing over a broad wavelength range in visible and near infrared regime. We have investigated and carried out detailed analysis to design high performance affinity biosensor by exploiting the unique optical properties of chalcogenide glass and graphene. The performance of the biosensor has been quantified in terms of sensitivity and detection accuracy. The sensitivity of proposed biosensor increases significantly due to the presence of graphene where as the detection accuracy increases by more than 100% because of high index chalcogenide glass as compared to silica glass. Also, the detection accuracy of the proposed sensor in near IR is 16 times more as compared to that in visible. Adequate values of crucial design parameters have been optimized to achieve the best possible sensing performance over a broad wavelength range. � 2012 Elsevier B.V. All rights reserved.Item Sensitivity enhancement of a surface plasmon resonance based biomolecules sensor using graphene and silicon layers(2011) Verma R.; Gupta B.D.; Jha R.A surface plasmon resonance based biomolecules sensor using silicon and graphene layers coated over the base of the high index prism sputtered with gold has been analyzed. The graphene layer has been used to enhance the adsorption of biomolecules while the addition of silicon layer between gold and graphene increases the sensitivity. The thicknesses of gold and silicon layers along with the number of graphene layers have been optimized to achieve the best performance of the sensor in terms of sensitivity and Full Width at Half Maximum (FWHM). To see the effect of wavelength of the light source, simulations have been carried out for three different wavelengths. The best performance is obtained for 633 nm wavelength with optimized thicknesses of gold and silicon layers as 40 nm and 7 nm respectively while the optimum number of graphene layers is 2. The sensitivity obtained with optimized parameters and additional silicon layer, is more than twice the value reported in the literature. � 2011 Elsevier B.V. All rights reserved.