Highly Sensitive D-Shaped Surface Plasmon Resonance-Based Photonic Crystal Fibre Refractive Index Sensor for Cancer Detection
AbstractIn this paper, we propose a highly sensitive Surface Plasmon Resonance-based single-core D-shaped Photonic Crystal Fibre using a nanocomposite material rather than a single metal. Except for a few microscopic air holes, the Photonic fibre is filled with fused silica. Titanium dioxide (\(TiO_2\)) nanoparticles wrapped in a layer of gold (Au) form the nanocomposite, which is the active material used in cancer detection using surface plasmon resonance. The nanocomposite material is deposited on the flat surface of the PCF, followed by an analyte sensing layer (blood cells). This type of analyte infiltration in the D-s...
Source: Plasmonics - March 14, 2024 Category: Biomedical Science Source Type: research
Multi-parameter Gold-Film Embedded PCF Sensors Based on Surface Plasmon Resonance
AbstractA novel multi-purpose sensor based on photonic crystal fiber and surface plasmon resonance is proposed, in which a gold film is deposited on the outer surface of the photonic crystal fiber to stimulate the surface plasmon resonance, and polydimethylsiloxane is deposited on the outer of the gold film for temperature sensing. Numerical results show that the proposed sensor can be used to achieve both independent detection of temperature and refractive index and simultaneous measurement of temperature and refractive index. When it is only used for temperature sensing, which can realize ultra-wide temperature detection...
Source: Plasmonics - March 12, 2024 Category: Biomedical Science Source Type: research
A Review of Developed Surface-Enhanced Raman Spectroscopy (SERS)-Based Sensors for the Detection of Common Hazardous Substances in the Agricultural Industry
AbstractIn order to guarantee food safety, preserve the environment, and protect the health of farmers and consumers, it is imperative that dangerous compounds in the agricultural sector be identified. When molecules are adsorbed on nanostructured metal surfaces, a method known as surface-enhanced Raman spectroscopy (SERS) amplifies Raman scattering signals. With its exact insights into molecular structures, this enhanced analytical capacity has significant implications for environmental monitoring, medical diagnostics, and materials characterization. The method is very useful for applications requiring precise molecular a...
Source: Plasmonics - March 11, 2024 Category: Biomedical Science Source Type: research
Theoretical Investigation of Surface Plasmon Polariton Propagation in Grating Nanostructure with Perturbation Approach
AbstractIn this paper, theoretical investigation of surface plasmon polariton (SPP) in nanostructure is performed with perturbation approach, using example of grating. Dispersion relation of SPP in grating is deduced with forbidden bandwidths calculated. And moreover, the transmission attenuation of two SPP modes is also investigated with analytical solutions provided at last. This investigation can not only give an understanding about the physical origin of the band gaps and attenuation difference in grating situation, but also provide information for grating fabrication based on required dispersion relation and transmiss...
Source: Plasmonics - March 11, 2024 Category: Biomedical Science Source Type: research
Baffle Induced Sensing Enhancement for Pressure and Refractive Index Based on Fano Resonance
In this study, we propose a novel metal –insulator-metal (MIM) waveguide structure that exhibits a distinct transmission spectrum featuring a sharp Fano line. Notably, the incorporation of a baffle into the resonator induces the formation of a double Fano resonance, which occurs irrespective of the presence of external pressure. Remarka bly, the second Fano resonance (FR2), effectively enhances the refractive index sensitivity of the system from 1400 nm/RIU to 1600 nm/RIU when the baffle is integrated into the pressure-free resonator. Furthermore, the introduction of a baffle into the pressurized cavity significantly i...
Source: Plasmonics - March 7, 2024 Category: Biomedical Science Source Type: research
Simply Developed Surface-Enhanced Raman Scattering (SERS) Sensors for Ultra-Sensitive Detection of Lindane Pesticide
AbstractAgriculture products with lindane residues pose serious health threats, including infertility in men and women and some types of cancer. Reproductive issues, such as decreased fertility and abnormal development, have been linked to long-term lindane exposure. In the present study, silver nanoparticles (AgNPs) coated on glass slides were developed through simple and cost-effective methods to be used as surface-enhanced Raman scattering (SERS) sensors. Then, different concentrations of lindane solutions (10−1 to 10−10 M) were prepared via serial dilution, deposited on the substrates and evaluated via Raman spectr...
Source: Plasmonics - March 6, 2024 Category: Biomedical Science Source Type: research
An enhanced electrochemical catalytic activity towards arsenic (III) detection based on FTO electrode modified with gold nanoparticles by irradiation and electrophoretic deposition
AbstractIn this work, the electrophoretic deposition (EPD) of gold nanoparticles (AuNPs) on the fluorine-doped tin oxide (FTO) electrode in ethanol solution obtained from irradiation was employed to fabricate the FTO/AuNPs electrode, which was used for As(III) detection in aqueous media. The AuNPs solution was obtained through the Co-60 isotope irradiation of chloroauric acid solution in ethanol, and the electrophoretic deposition was performed at a constant voltage of 100 V for 30 min using the ethanolic AuNPs solution. The EPD conditions were optimized using cyclic voltammetry in hydroquinone/sodium perchlorate soluti...
Source: Plasmonics - March 5, 2024 Category: Biomedical Science Source Type: research
Ag Ions Versus Ag Nanoparticle-Embedded Glass for Antimicrobial Activity Under Light
This study aims to compare the toxicity of Ag+ ions versus the plasmonic effect of Ag NPs within a glass matrix, assessing their respective killing efficiency and mechanisms against microorganisms. To achieve this objective, a simple ion exchange technique was employed to embed glass with silver ions, nanoclusters (NCs), or NPs, which was confirmed by UV –Vis-NIR spectrometer, photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The biocidal action of these Ag species on modelEscherichia coli (E. coli) bacteria was investigated in the absence and presence of visible ...
Source: Plasmonics - March 5, 2024 Category: Biomedical Science Source Type: research
Eco-Friendly Fabrication of Silver Nanoparticles for Sustainable Water Purification and Antibacterial Synergy
AbstractSilver nanoparticles (AgNPs) were synthesized using the aqueous extract ofTerminalia chebula (T-Chebula) fruits. Characterization through X-ray diffraction (XRD) and scanning electron microscopy (SEM) revealed AgNPs with a crystalline size ranging from 21 to 24 nm. The biosynthesized AgNPs exhibited a morphology unique to T-Chebula-AgNPs (TC-AgNPs), with an average size of 50 nm and a band gap energy of 2.8 eV. Evaluation of antimicrobial properties againstEscherichia coli (E. coli) showcased the potential antibacterial activity of AgNPs compared to the standard gentamicin antibiotic. Notably, increasing concen...
Source: Plasmonics - March 4, 2024 Category: Biomedical Science Source Type: research
A High-Precision D-Shaped Fiber Polishing Method and its Sensing Characteristics of Different Polishing Depths
AbstractIn this paper, a simple and low-cost side-wheel polishing machine was designed and fabricated to enable the fabrication of D-shaped optical fibers. Scanning electron microscope (SEM) characterization of the fabricated polishing fiber cross section confirms the high precision of the polishing machine. The optimal parameters for the preparation of D-shaped SPR sensors were determined by simulation. A gold film was coated on the surface of D-shaped optical fibers with different polishing depths to realize the surface plasmon resonance (SPR) effect and used it for refractive index (RI) detection. The sensitivity of the...
Source: Plasmonics - March 4, 2024 Category: Biomedical Science Source Type: research
A Highly Sensitive Long-Range Surface Plasmon Resonance Biosensor for the Determination of Hemoglobin Content in Human Blood
AbstractA surface plasmon resonance (SPR) biosensor with Kretschmann configuration and wide-range detection capability for measuring hemoglobin content in human blood has been proposed. The biosensor utilizes BK7 prism/Ag/ α-SnSe/Ag/graphene architecture to detect hemoglobin concentration in human blood samples. The graphene layer was incorporated into the original structure to enhance the sensitivity of the device. Furthermore, layers were optimized, and the transfer matrix method determined the device’s reflectan ce. A high sensitivity of 184 degree.RIU−1 was obtained for the original structure, which increased to 1...
Source: Plasmonics - March 4, 2024 Category: Biomedical Science Source Type: research
Anomalous Photoluminescence Behavior and Judd –Ofelt Analysis of Erbium-Barium Borate Glass Embedded with Copper Oxide Nanoclusters
AbstractGlasses doped with rare earth elements have been extensively researched for the purpose of creating novel and effective photonic devices. The impact of the LSPR of metallic nanoparticles on rare earth –doped glass for manipulating luminescent properties is a new matter of study. As a result, the localized surface plasmon resonance (LSPR) of metallic nanoparticles (NPs) in amorphous materials may create new opportunities in the disciplines of optics and photonics. Therefore, erbium-barium borate glasses with a 60B2O3-38.5BaO-1.5Er2O3-xCu2O-xSnO (x = 0, 1, 2, 3, 4, 5 mol%) composition were synthesized by the m...
Source: Plasmonics - March 2, 2024 Category: Biomedical Science Source Type: research
A Portable Microfluidic Device-Based Colorimetric Naked-Eye Sensors for Determination of Mercury and Arsenic Ions in River Water Samples
AbstractThe contamination of drinking water by heavy metals, such as arsenic and mercury, is a global concern. Herein, we have developed a sensitive, cost-effective, and novel 3D-printed microfluidic device featuring two V-channels (Hg-sensor and As-sensor) for naked-eye colorimetric detection of mercury and arsenic in water samples from Tigris River. In Hg-sensor, a rapid and eco-friendly colorimetric sensor of silver nanoparticles (AgNPs) has been prepared usingBoswellia sacra extract as a stabilizing and reducing agent to selectively detect mercury ions. Several techniques have been used to characterize the morphology o...
Source: Plasmonics - March 2, 2024 Category: Biomedical Science Source Type: research
Parameter Multiplexing-Based Terahertz Enhanced Absorption Spectra Using Ultrathin Metal Groove Array
This study demonstrates the enhancement of terahertz absorption spectra in bio-molecular materials by utilizing a metal groove array in geometry parameters multiplexing and the relationship between the enhancement characteristics and the thickness of the sample as well as the number of structural grooves. The results indicate that the absorption enhancement factor for a 0.1- μm-thick lactose sample is approximately 120 times. This design offers a better method for detecting bio-molecular materials. (Source: Plasmonics)
Source: Plasmonics - February 29, 2024 Category: Biomedical Science Source Type: research
Performance Analysis of Ag-TiO $$_2$$ -Coated Hexagonal-Shaped Photonic Crystal Fiber Plasmonic Sensor and Ethanol ’s Low Water Content Detection
AbstractThis paper proposed a photonic crystal fiber (PCF) sensor to detect low water content in ethanol. An Ag-TiO\(_2\) layer is used to achieve high sensitivity of this surface plasmon resonance (SPR)-based sensor. Moreover, TiO\(_2\) layer reduces chemical instability of silver and enhances SPR effect. This paper carried out numerical analysis of sensor using finite element method (FEM). For evaluating effectiveness of a sensor to detect a target analyte, its confinement loss, sensitivity to changes in amplitude and wavelength can be measured by tuning some impactful parameters like airhole diameter, thickness of silve...
Source: Plasmonics - February 29, 2024 Category: Biomedical Science Source Type: research
