Performance analysis of a plasmonic sensor based on gold nanoparticle film in infrared light using the admittance loci method
TL;DR: In this paper, a theoretical design of surface plasmon resonance (SPR) structure operating in attenuated total reflection (ATR) mode and comprising of silicon or chalcogenide (2S2G) prism material coated with gold film having different nanoparticle sizes has been reported along with some interesting performance related simulation results at the operating wavelength of 1200 nm in infrared.
Abstract: A theoretical design of surface plasmon resonance (SPR) structure operating in attenuated total reflection (ATR) mode and comprising of silicon or chalcogenide (2S2G) prism material coated with gold film having different nanoparticle sizes has been reported along with some interesting performance related simulation results at the operating wavelength of 1200 nm in infrared The admittance loci based technique has been employed for the appropriate choice of the metal layer thickness The sensitivity and other performance parameters of the structure based on the choice of the high index prism material and correct gold nanoparticle size have also been presented In comparison to other conventional prism based plasmonic structures, the proposed model provides the extra degree of freedom, ie, variations of nanoparticle size in addition to the variation in layer thickness and the use of different high index prism materials like silicon, 2S2G materials, etc Moreover, the width of the SPR curve can be controll
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TL;DR: In this article, a non-universal behavior of leaky surface plasmon waves on asymmetric (Si/Au/analyte of different height) 1D grating through numerical modeling is investigated.
Abstract: We report on a non-universal behavior of leaky surface plasmon waves on asymmetric (Si/Au/analyte of different height) 1D grating through numerical modelling. The occurrence of the leaky surface wave was maximized (suppressing the Fabry–Perot cavity mode), which can be identified in a reflection spectrum through characteristic minimum. Beyond a specific analyte height (h), new sets of surface waves emerge, each bearing a unique reflection minimum. Furthermore, all of these minima depicted a red-shift before saturating at higher h values. This saturation is found to be non-universal despite the close association with their origin (being leaky surface waves). This behavior is attributed to the fundamental nature and the origin of the each set. Additionally, all of the surface wave modes co-exit at relatively higher h values.
25 citations
TL;DR: In this article , a novel fiber optic-based plasmonic biosensor that can be used for sensitive detection of SARS-CoV-2 has been proposed for reliable, sensitive, and reproducible detection.
Abstract: The coronavirus (COVID-19) pandemic has put the entire world at risk and caused an economic downturn in most countries. This work provided theoretical insight into a novel fiber optic-based plasmonic biosensor that can be used for sensitive detection of SARS-CoV-2. The aim was always to achieve reliable, sensitive, and reproducible detection. The proposed configuration is based on Ag-Au alloy nanoparticle films covered with a layer of graphene which promotes the molecular adsorption and a thiol-tethered DNA layer as a ligand. Here, the combination of two recent approaches in a single configuration is very promising and can only lead to considerable improvement. We have theoretically analyzed the sensor performance in terms of sensitivity and resolution. To highlight the importance of the new configuration, a comparison was made with two other sensors. One is based on gold nanoparticles incorporated into a host medium; the other is composed of a bimetallic Ag-Au layer in the massive state. The numerical results obtained have been validated and show that the proposed configuration offers better sensitivity (7100 nm\RIU) and good resolution (figure of merit; FOM = 38.88 $${RIU}^{-1}$$ and signal-to-noise ratio; SNR = 0.388). In addition, a parametric study was performed such as the graphene layers’ number and the size of the nanoparticles.
14 citations
TL;DR: In this article, a plasmonic biosensor comprising of prism as a light coupling material, gold (Au) as a plasm supporting metal and oxygenated native hemoglobin (Hb) solution as a bio sample operating under attenuated total reflection (ATR) mode has been modelled using the admittance loci method for detecting wavelength and concentration dependent refractive index (RI) variations of oxygenatednative Hb solution for 700nm to 900nm wavelength in near infrared (NIR).
5 citations
15 Jun 2015
TL;DR: In this article, an admittance loci method is used to model and analyze performance of a chalcogenide prism based plasmonic biomolecular sensor for detection of wavelength dependent refractive index change of human blood sample under angular interrogation mode.
Abstract: In this work, admittance loci method is used to model and analyze performance of a chalcogenide prism based plasmonic
biosensor comprising of gold metal nanoparticle film for detection of wavelength dependent refractive index change of
human blood sample under angular interrogation mode. The wavelength dependent performance of the plasmonic
biosensor based on the choice of chalcogenide (2S2G) as a coupling prism material has been discussed with the help of
performance parameter plots.
Cites methods from "Performance analysis of a plasmonic..."
...For gold nanoparticle film the modified admittances are given by ( ) i m k m in i p n m k m n s m θ θ η cos 2 / 1 2 2 sin 2 2 2 − − − = (7)...
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TL;DR: In this article, a fused silica (SiO 2 ) glass prism-based plasmonic structure comprising of indium oxide ( In 2 O 3 )-zirconium dioxide ( ZrO 2 ), silver (Ag) and zinc oxide (ZnO) intermediate layers showing enhancement in sensitivity and figure-of-merit (FOM) in visible and infrared regime was reported.
Abstract: Modeling of a fused silica ( SiO 2 ) glass prism-based plasmonic structure comprising of indium oxide ( In 2 O 3 )–zirconium dioxide ( ZrO 2 )–silver (Ag)–zinc oxide (ZnO) intermediate layers showing enhancement in sensitivity and figure-of-merit (FOM) in visible and infrared regime has been reported in this paper. Performance of the proposed plasmonic structure has been demonstrated in terms of sensitivity, half width (HW), detection accuracy (DA), and FOM parameters in visible (632.8 nm) and infrared (1200 nm) wavelength of light. High sensitivity of fused silica glass material, In 2 O 3 , ZnO films along with high DA and high FOM of Ag and inclusion of ZrO 2 as an oxidation protective layer in between In 2 O 3 and Ag have been the most exciting and advantageous features of our proposed structure. Simulated sensitivity values of our proposed structure were found to be 73.8 deg/RIU at 632.8 nm wavelength and it was found enhanced to 109.6 deg/RIU at 1200 nm wavelength and simulated FOM values were also found enhanced from 23.3544 RIU− 1 at 632.8 nm to 62.6285 RIU− 1 at 1200 nm wavelength for change in sensing layer refractive indices from 1.30 RIU to 1.35 RIU.
Additional excerpts
...EQ-TARGET;temp:intralink-;e008;63;448qk 1⁄4 ðεk − n(2)1 sin(2) θ1Þ εk ; (8)...
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References
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TL;DR: In this paper, a surface plasmon resonance (SPR) sensing configuration equipped with a silicon coupling prism is described, and theoretical results and experimental data are obtained to establish essential conditions of SPR excitation using infrared light in the Kretschmann-Raether geometry with a thin gold layer as the supporting metal.
Abstract: A novel surface plasmon resonance (SPR) sensing configuration equipped with a silicon coupling prism is described. Theoretical results and experimental data are obtained to establish essential conditions of SPR excitation using infrared light in the Kretschmann–Raether geometry with a thin gold layer as the supporting metal. We also compare sensitivities of different angular and spectral interrogation Si-based schemes in models of bio- and chemical sensing. Possibilities for the miniaturization of SPR sensors using the proposed Si-based configuration are discussed.
62 citations
TL;DR: In this paper, numerical simulations have been carried out to investigate the potentialities of sulfide glass from the GeGaSbS system as a coupling prism material, and an angular modulation SPR biosensor was set up in the Kretschmann-Raether arrangement.
Abstract: The surface plasmon resonance phenomenon has been studied in a chalcogenide glass-based optical system. IR transmission properties of these materials combined to their high refractive indices lead to advantageous properties for sensing. In this study, numerical simulations have been carried out to investigate the potentialities of sulfide glass from the GeGaSbS system as a coupling prism material. Then, an angular modulation SPR biosensor has been set up in the Kretschmann–Raether arrangement. Experimental data are consistent with numerical calculation and the detection limit of the sensor is 3 × 10−5 RIU. These preliminary results are promising. Further investigations have to be carried out to confirm the great potentialities of those materials for SPR-based biosensor.
49 citations
TL;DR: In this article, an admittance locus is applied for the design of multilayer surface plasmon resonance (SPR) devices, including symmetric (glass|Au(40nm) −[TiO 2 (20nm)−SiO 2(20nm)] 4 -au(30
Abstract: Dielectric mirror types of multilayer structures have been applied to enhance the performance of surface plasmon resonance (SPR) devices. It demands a more robust design method than traditional Fresnel's equations. An admittance locus is a kind of optical thin film design method which has been extensively used for high performance optical coatings. We have applied this method for the design of multilayer SPR devices, including symmetric (glass|Au(40 nm)–[TiO 2 (20 nm)–SiO 2 (20 nm)] 4 –Au(30 nm)) and asymmetric (glass|Ag(50 nm)–[TiO 2 (20 nm)–SiO 2 (20 nm)] 4 –Au(20 nm)) structure. It provides a much necessary guidance for the choices of suitable optical materials, thickness, and number of layers for the intended SPR performance. With a 633 nm light source and a BK7 coupling prism under water, one can shift the resonant angle toward the critical angle and have smaller half maximum band widths (HMBW) at (64°, 2°) and (61.52°, 0.25°) for symmetric and asymmetric designs, respectively.
49 citations
TL;DR: In this article, a plasmonic coupling device consisting of a periodic array of ellipsoidal silver nanoparticles embedded in SiO2 and placed near a silver surface is discussed.
Abstract: We discuss a plasmonic coupling device consisting of a periodic array of ellipsoidal silver nanoparticles embedded in SiO2 and placed near a silver surface. By tuning the shape of the particles in the array, the nanoparticle plasmon resonance is tuned. The resulting resonantly enhanced fields near the nanoparticles, in turn, excite surface plasmons on the metal film. We have performed finite integration technique simulations of such a plasmon coupler, optimized for operation near a wavelength of 676nm. Analysis of the frequency dependent electric field at different locations in the simulation volume reveals the separate contributions of the particle and surface resonance to the excitation mechanism. A coupled oscillator model describing the nanoparticle and the metal film as individual resonators is introduced and is shown to reproduce the trends observed in the simulations. Implications of our analysis on the resonantly enhanced excitation of surface plasmons are discussed.
49 citations
TL;DR: In this paper, an aluminum-gold configuration for electric field enhancement based on surface plasmon resonance phenomenon is proposed and the results and study show that for optimized bimetallic configuration (6'nm Au and 29'nm Al) along with chalcogenide prism, the electric fields enhancement at the metal-analyte interface is more than 15 times greater and its probing depth was more than 300% longer than that of the gold based BK7 configuration.
Abstract: An aluminium-gold configuration for electric field enhancement based on surface plasmon resonance phenomenon is proposed. Our results and study show that for optimized bimetallic configuration (6 nm Au and 29 nm Al) along with chalcogenide prism, the electric field enhancement at the metal-analyte interface is more than 15 times greater and its probing depth is more than 300% longer than that of the gold based BK7 configuration thereby opening a new window for monitoring the biomolecular interactions in the vicinity of metal-analyte interface for various applications.
40 citations