This paper reports on high-accuracy simulation of a grating structure based fiber optic plasmonic... more This paper reports on high-accuracy simulation of a grating structure based fiber optic plasmonic sensor for salivary cortisol sensing. Gratings of SiO2 and SiC (one at a time) in combination with a thin Ag layer are considered to be in direct contact with analyte medium (solutions containing different concentrations of cortisol) considering that the groove regions are also filled with analyte. The optimization of Ag layer thickness is carried out to achieve maximum power loss (PL) corresponding to cortisol concentration variation. The variation of PL (in dB) spectra with the angle of incidence (α) is the sensing mechanism of the proposed scheme. Sensing performance is extensively analyzed in terms of sensitivity, limit-of-detection (LOD) and figure-of-merit (FOM) that incorporates both the sensitivity and the width of the corresponding PL curves. While the sensitivity and FOM values are significantly large, the results also reveal that in angular interrogation mode (AIM), an averag...
Two-dimensional (2D) heterostructure materials show captivating properties for application in sur... more Two-dimensional (2D) heterostructure materials show captivating properties for application in surface plasmon resonance (SPR) sensors. A fluoride fiber-based SPR sensor is proposed and simulated with the inclusion of a 2D heterostructure as the analyte interacting layer. The monolayers of two 2D heterostructures (BlueP/MoS2 and BlueP/WS2, respectively) are considered in near infrared (NIR). In NIR, an HBL (62HfF4-33BaF2-5LaF3) fluoride glass core and NaF clad are considered. The emphasis is placed on figure of merit (FOM) enhancement via optimization of radiation damping through simultaneous tuning of Ag thickness (dm) and NIR wavelength (λ) at the Ag-2D heterostructure–analyte interfaces. Field distribution analysis is performed in order to understand the interaction of NIR signal with analyte at optimum radiation damping (ORD) condition. While the ORD leads to significantly larger FOM for both, the BlueP/MoS2 (FOM = 19179.69 RIU−1 (RIU: refractive index unit) at dm = 38.2 nm and λ...
In this paper, an optical absorption based fiber optic surface plasmon resonance (SPR) sensor has... more In this paper, an optical absorption based fiber optic surface plasmon resonance (SPR) sensor has been studied theoretically. The theoretical treatment is based on Kretschmann’s SPR theory and the Lorentz model that expresses a damped harmonic oscillator is included in the treatment for optical absorption in the sensing layer. The optical source considered is an un-polarized collimated beam. The light
A multi-layered surface plasmon resonance (SPR)-based fiber optic absorption sensor has been stud... more A multi-layered surface plasmon resonance (SPR)-based fiber optic absorption sensor has been studied theoretically. The sensitivity is evaluated for the p-polarized light launched in the fiber using ray approximation. Four-layers configuration is used to excite the surface plasmon wave. The first layer or the medium considered is the core of the fiber. Second and third layers are metallic (silver and
Abstract High performance surface plasmon resonance (SPR) sensor is proposed for relative humidit... more Abstract High performance surface plasmon resonance (SPR) sensor is proposed for relative humidity (RH) monitoring. The structure is based on widely used 2S2G chalcogenide glass and gold as SPR active metal applied with silica-based porous film. The angular interrogation method has been used to study the performance of the sensor in terms of intrinsic sensitivity (SI) that includes the width and shifts of SPR curve for the entire RH-range between 0% and 100%. The effect of temperature is also studied on the proposed sensor's performance. Any possibility of oxidation problem to the proposed SPR sensor due to constantly being in contact with humid environment may be addressed by using a stable buffer layer. Intrinsic sensitivity of the proposed sensor is significantly high for almost entire range of RH values. The proposed sensor has a good resolution of the order of 10−2% RH.
Surface plasmon resonance (SPR) sensor schemes based on silicon (Si) and chalcogenide glass are e... more Surface plasmon resonance (SPR) sensor schemes based on silicon (Si) and chalcogenide glass are evaluated and compared for chemical as well as gas detection in a wide range of infrared (IR) wavelengths. The plasmonic characteristics in IR are critically dependent on the dispersive behavior of the coupling substrate material. The performance of sensor has been evaluated in terms of its intrinsic sensitivity (IS) that includes the FWHM and angular shift of SPR curve for a given change in refractive index of sensing medium. Both these materials ...
In this paper, a theoretical analysis is carried out to estimate the sensitivity and the signal-t... more In this paper, a theoretical analysis is carried out to estimate the sensitivity and the signal-to-noise ratio (SNR) of a fiber optic surface plasmon resonance (SPR) sensor when fibers with different dopants and different doping concentrations are used. The dopants considered ...
In the present work, a detailed theoretical analysis of a surface plasmon resonance (SPR)-based f... more In the present work, a detailed theoretical analysis of a surface plasmon resonance (SPR)-based fiber optic sensor with an alternating dielectric multilayer system is carried out. The dielectric system consists of silica and titanium oxide layers. The effect of critical design parameters on the sensor's sensitivity and detection accuracy is studied. The results are explained in terms of appropriate physical phenomena, wherever required. Based on the analysis, a new design of a fiber optic SPR sensor for gas detection is proposed. The analysis of such a gas sensor is carried out for four metals separately for a clear understanding. The proposed gas sensor is able to provide reasonably high values of all the performance parameters simultaneously, as required for an efficient detection of gaseous media.
Page 1. Fibre-optic sensor based on surface plasmon resonance with AgAu alloy nanoparticle films... more Page 1. Fibre-optic sensor based on surface plasmon resonance with AgAu alloy nanoparticle films This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2006 Nanotechnology 17 124 (http://iopscience.iop.org/0957-4484/17/1/020) ...
Journal of Optics A: Pure and Applied Optics, 2007
ABSTRACT In the present work, a novel design for a fibre optic surface plasmon resonance (SPR) se... more ABSTRACT In the present work, a novel design for a fibre optic surface plasmon resonance (SPR) sensor with a metal–semiconductor core–shell nanocomposite layer is proposed. The performance of the sensor is evaluated and compared for various commonly used semiconductors such as CdS, PbS, ZnO and CdSe. The capabilities of different metals such as silver and gold are analysed and compared. The performance of the sensor is evaluated in terms of its performance parameters, namely sensitivity and signal-to-noise ratio (SNR). The present design is compared with a previously proposed design of Au–SiO2 based fibre optic SPR sensor and it is found that the present design performs much better. On the basis of the whole analysis, an optimum design is predicted in order to attain a fibre optic SPR nanosensor with maximum sensitivity and SNR.
Journal of Optics A: Pure and Applied Optics, 2008
Page 1. Fibre optic sensor based on long-range surface plasmon resonance: a theoretical analysis ... more Page 1. Fibre optic sensor based on long-range surface plasmon resonance: a theoretical analysis This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2007 J. Opt. A: Pure Appl. Opt. 9 682 ...
Journal of Optics A: Pure and Applied Optics, 2009
Page 1. Chalcogenide glass prism based SPR sensor with AgAu bimetallic nanoparticle alloy in inf... more Page 1. Chalcogenide glass prism based SPR sensor with AgAu bimetallic nanoparticle alloy in infrared wavelength region This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2009 J. Opt. A: Pure Appl. Opt. 11 045502 ...
On the performance of different bimetallic combinations in surface plasmon resonance based fiber ... more On the performance of different bimetallic combinations in surface plasmon resonance based fiber optic sensors. [Journal of Applied Physics 101, 093111 (2007)]. Anuj K. Sharma, BD Gupta. Abstract. In the present work, we have ...
Abstract A theoretical model for a gas sensor based on chalcogenide prism and surface plasmon res... more Abstract A theoretical model for a gas sensor based on chalcogenide prism and surface plasmon resonance is proposed. The metal layer consists of Ag–Au alloy nanoparticles. The chalcogenide prism is made of sulfide glass Ge 20 Ga 5 Sb 10 S 65, commonly known as 2S2G. The angular interrogation method is used to analyze the sensor's performance in terms of its intrinsic sensitivity that takes into account both the angular shift as well as the angular width of plasmon resonance curve. The effect of operating wavelength along with ...
This paper reports on high-accuracy simulation of a grating structure based fiber optic plasmonic... more This paper reports on high-accuracy simulation of a grating structure based fiber optic plasmonic sensor for salivary cortisol sensing. Gratings of SiO2 and SiC (one at a time) in combination with a thin Ag layer are considered to be in direct contact with analyte medium (solutions containing different concentrations of cortisol) considering that the groove regions are also filled with analyte. The optimization of Ag layer thickness is carried out to achieve maximum power loss (PL) corresponding to cortisol concentration variation. The variation of PL (in dB) spectra with the angle of incidence (α) is the sensing mechanism of the proposed scheme. Sensing performance is extensively analyzed in terms of sensitivity, limit-of-detection (LOD) and figure-of-merit (FOM) that incorporates both the sensitivity and the width of the corresponding PL curves. While the sensitivity and FOM values are significantly large, the results also reveal that in angular interrogation mode (AIM), an averag...
Two-dimensional (2D) heterostructure materials show captivating properties for application in sur... more Two-dimensional (2D) heterostructure materials show captivating properties for application in surface plasmon resonance (SPR) sensors. A fluoride fiber-based SPR sensor is proposed and simulated with the inclusion of a 2D heterostructure as the analyte interacting layer. The monolayers of two 2D heterostructures (BlueP/MoS2 and BlueP/WS2, respectively) are considered in near infrared (NIR). In NIR, an HBL (62HfF4-33BaF2-5LaF3) fluoride glass core and NaF clad are considered. The emphasis is placed on figure of merit (FOM) enhancement via optimization of radiation damping through simultaneous tuning of Ag thickness (dm) and NIR wavelength (λ) at the Ag-2D heterostructure–analyte interfaces. Field distribution analysis is performed in order to understand the interaction of NIR signal with analyte at optimum radiation damping (ORD) condition. While the ORD leads to significantly larger FOM for both, the BlueP/MoS2 (FOM = 19179.69 RIU−1 (RIU: refractive index unit) at dm = 38.2 nm and λ...
In this paper, an optical absorption based fiber optic surface plasmon resonance (SPR) sensor has... more In this paper, an optical absorption based fiber optic surface plasmon resonance (SPR) sensor has been studied theoretically. The theoretical treatment is based on Kretschmann’s SPR theory and the Lorentz model that expresses a damped harmonic oscillator is included in the treatment for optical absorption in the sensing layer. The optical source considered is an un-polarized collimated beam. The light
A multi-layered surface plasmon resonance (SPR)-based fiber optic absorption sensor has been stud... more A multi-layered surface plasmon resonance (SPR)-based fiber optic absorption sensor has been studied theoretically. The sensitivity is evaluated for the p-polarized light launched in the fiber using ray approximation. Four-layers configuration is used to excite the surface plasmon wave. The first layer or the medium considered is the core of the fiber. Second and third layers are metallic (silver and
Abstract High performance surface plasmon resonance (SPR) sensor is proposed for relative humidit... more Abstract High performance surface plasmon resonance (SPR) sensor is proposed for relative humidity (RH) monitoring. The structure is based on widely used 2S2G chalcogenide glass and gold as SPR active metal applied with silica-based porous film. The angular interrogation method has been used to study the performance of the sensor in terms of intrinsic sensitivity (SI) that includes the width and shifts of SPR curve for the entire RH-range between 0% and 100%. The effect of temperature is also studied on the proposed sensor's performance. Any possibility of oxidation problem to the proposed SPR sensor due to constantly being in contact with humid environment may be addressed by using a stable buffer layer. Intrinsic sensitivity of the proposed sensor is significantly high for almost entire range of RH values. The proposed sensor has a good resolution of the order of 10−2% RH.
Surface plasmon resonance (SPR) sensor schemes based on silicon (Si) and chalcogenide glass are e... more Surface plasmon resonance (SPR) sensor schemes based on silicon (Si) and chalcogenide glass are evaluated and compared for chemical as well as gas detection in a wide range of infrared (IR) wavelengths. The plasmonic characteristics in IR are critically dependent on the dispersive behavior of the coupling substrate material. The performance of sensor has been evaluated in terms of its intrinsic sensitivity (IS) that includes the FWHM and angular shift of SPR curve for a given change in refractive index of sensing medium. Both these materials ...
In this paper, a theoretical analysis is carried out to estimate the sensitivity and the signal-t... more In this paper, a theoretical analysis is carried out to estimate the sensitivity and the signal-to-noise ratio (SNR) of a fiber optic surface plasmon resonance (SPR) sensor when fibers with different dopants and different doping concentrations are used. The dopants considered ...
In the present work, a detailed theoretical analysis of a surface plasmon resonance (SPR)-based f... more In the present work, a detailed theoretical analysis of a surface plasmon resonance (SPR)-based fiber optic sensor with an alternating dielectric multilayer system is carried out. The dielectric system consists of silica and titanium oxide layers. The effect of critical design parameters on the sensor's sensitivity and detection accuracy is studied. The results are explained in terms of appropriate physical phenomena, wherever required. Based on the analysis, a new design of a fiber optic SPR sensor for gas detection is proposed. The analysis of such a gas sensor is carried out for four metals separately for a clear understanding. The proposed gas sensor is able to provide reasonably high values of all the performance parameters simultaneously, as required for an efficient detection of gaseous media.
Page 1. Fibre-optic sensor based on surface plasmon resonance with AgAu alloy nanoparticle films... more Page 1. Fibre-optic sensor based on surface plasmon resonance with AgAu alloy nanoparticle films This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2006 Nanotechnology 17 124 (http://iopscience.iop.org/0957-4484/17/1/020) ...
Journal of Optics A: Pure and Applied Optics, 2007
ABSTRACT In the present work, a novel design for a fibre optic surface plasmon resonance (SPR) se... more ABSTRACT In the present work, a novel design for a fibre optic surface plasmon resonance (SPR) sensor with a metal–semiconductor core–shell nanocomposite layer is proposed. The performance of the sensor is evaluated and compared for various commonly used semiconductors such as CdS, PbS, ZnO and CdSe. The capabilities of different metals such as silver and gold are analysed and compared. The performance of the sensor is evaluated in terms of its performance parameters, namely sensitivity and signal-to-noise ratio (SNR). The present design is compared with a previously proposed design of Au–SiO2 based fibre optic SPR sensor and it is found that the present design performs much better. On the basis of the whole analysis, an optimum design is predicted in order to attain a fibre optic SPR nanosensor with maximum sensitivity and SNR.
Journal of Optics A: Pure and Applied Optics, 2008
Page 1. Fibre optic sensor based on long-range surface plasmon resonance: a theoretical analysis ... more Page 1. Fibre optic sensor based on long-range surface plasmon resonance: a theoretical analysis This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2007 J. Opt. A: Pure Appl. Opt. 9 682 ...
Journal of Optics A: Pure and Applied Optics, 2009
Page 1. Chalcogenide glass prism based SPR sensor with AgAu bimetallic nanoparticle alloy in inf... more Page 1. Chalcogenide glass prism based SPR sensor with AgAu bimetallic nanoparticle alloy in infrared wavelength region This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2009 J. Opt. A: Pure Appl. Opt. 11 045502 ...
On the performance of different bimetallic combinations in surface plasmon resonance based fiber ... more On the performance of different bimetallic combinations in surface plasmon resonance based fiber optic sensors. [Journal of Applied Physics 101, 093111 (2007)]. Anuj K. Sharma, BD Gupta. Abstract. In the present work, we have ...
Abstract A theoretical model for a gas sensor based on chalcogenide prism and surface plasmon res... more Abstract A theoretical model for a gas sensor based on chalcogenide prism and surface plasmon resonance is proposed. The metal layer consists of Ag–Au alloy nanoparticles. The chalcogenide prism is made of sulfide glass Ge 20 Ga 5 Sb 10 S 65, commonly known as 2S2G. The angular interrogation method is used to analyze the sensor's performance in terms of its intrinsic sensitivity that takes into account both the angular shift as well as the angular width of plasmon resonance curve. The effect of operating wavelength along with ...
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