Design Broadband Circular Dichroism Filter Regulated by Stacked C-Shaped Plasmon Chiral Metamaterial
AbstractChiral metamaterials have attracted significant attention due to their unique optical properties, such as strong circular dichroism (CD) signals, which arise from the interaction between circularly polarized light and chiral structures. In this paper, we provide a three-dimensional chiral metamaterial platform with a stacked C-shaped unit cell for plasmonic excitation-based enhancement and tuning of the CD signals. Numerically, simulations of chiral metamaterials show that the strong CD response is displayed in the infrared light spectrum, where the greatest CD value is 85% at 1445 Â nm. There is also almost no tra...
Source: Plasmonics - December 6, 2023 Category: Biomedical Science Source Type: research
SERS Sensor for Cu2+ Detection Based on Etching Reactions
AbstractThe presence of copper ions (Cu2+) in excessive amounts can pose significant health risks. Therefore, the development of a rapid and highly sensitive technique for detecting even trace quantities of Cu2+ is of paramount importance. The proposed detection approach leverages the core-shell design of Au@Ag NPs functioning as the sensing substrate. The substrates were coupled with Raman probe molecules, namely, 4-mercaptobenzoic acid (4-MBA) and iodine ions (I−), resulting in the formation of the Au@Ag NPs-4-MBA-I− detection system. In this system, interactions between Cu2+ and I− took place, leading to the gener...
Source: Plasmonics - December 6, 2023 Category: Biomedical Science Source Type: research
Design of Graphene-Based Tunable Plasmonic Antenna for Multiband Terahertz Application Systems
This article presents a systematic technique for designing a novel multiband plasmonic antenna based on graphene with a silicon nitride (SiO3N4) dielectric substrate in the terahertz band frequencies. Higher conductivity values are found in the 1 –5 THz ranges when the graphene conductivity values are measured at these band frequencies. Based on this, graphene chemical potential (μc) values between 0.0 and 1.0  eV are implemented to derive the fundamental antenna parameters. According to the simulated results, the proposed antenna operates at dual-band frequencies whenμc is less than 0.3  eV and at triple-band freque...
Source: Plasmonics - December 5, 2023 Category: Biomedical Science Source Type: research
Preparation of Silver Nanoparticles Using Laser Ablation for In Vitro Treatment of MCF-7 Cancer Cells with Antibacterial Activity
In this study, silver nanoparticles (Ag NPs) dispersed in deionized water (DW) are prepared using the Nd:YAG laser ablation method. Transmission electron microscopy (TEM) results were used to investigate the shape and particle size of Ag NPs. The spherical shape and size of about 30 nm are characterized. X-ray diffraction (XRD) analysis shows a good crystallinity of Ag NPs and distinguished peaks at 38 ° without any impurities. The optical properties of Ag NPs were studied by a UV–visible spectrophotometer, and the surface plasmon resonance was observed at an excitation wavelength of about 402 nm and a direct band gap o...
Source: Plasmonics - December 4, 2023 Category: Biomedical Science Source Type: research
Prepared Plasmonic Glass Substrates via Electrodeposition for Detecting Trace Glucose: SERS, DFT, and FDTD Investigations
AbstractGlucose plays a key role in the regulation of the levels of blood sugar, and the body closely monitors it to maintain proper metabolic function. Although glucose is essential for human health, its excessive consumption can lead to negative effects such as obesity and diabetes. As a result, high-sensitive and accurate glucose detection is considered an essential measure in clinical analysis. Surface-enhanced Raman scattering (SERS) is an accurate method for identifying trace substances. In the present study, SERS-active substrates were used for detecting different concentrations of glucose. First, gold nanoparticles...
Source: Plasmonics - December 4, 2023 Category: Biomedical Science Source Type: research
Improved Sensitivity of a Sensor Based on Metallic Nano-cylinder Coated with Graphene
AbstractThis paper introduces a highly sensitive biosensor based on a plasmonic nanostructure-enhanced resonance effect. The sensor exploits a hexagonal photonic crystal composed of plasmonic nano-cylinders, including a graphene nano-cylinder as a defect, which can considerably increase the concentration of electric fields. This amplification enables the detection of tiny variations in refractive indices linked to a laser source for plasmonic excitation. Each defect consists of a hollow metallic cylinder surrounded by graphene, all within a metallic matrix. During the sensing process, surface plasmon polaritons interact wi...
Source: Plasmonics - December 2, 2023 Category: Biomedical Science Source Type: research
Cherenkov Terahertz Surface Plasmon Generation Over Graphene Surface by an Electron Beam
AbstractCherenkov terahertz (THz) surface plasmons (SPs) generation by a relativistic electron beam over the graphene surface, deposited on a\(\text {SiO}_2\) substrate, is investigated. The relativistic electron beam tassel produced by SPs produces perturbed linear current density and develops THz SPs via Cherenkov interaction. Electron beam energy from 498.91 to 499.03 KeV is essential for the excitation of THz SPs of 3 to 10 THz. The growth rate of THz SPs depends on the electron beam density and Fermi energy of the graphene surface. The current investigation possesses the potential to be harnessed for the utilization o...
Source: Plasmonics - December 2, 2023 Category: Biomedical Science Source Type: research
A Perfect Absorber for Ultra-long-wave Infrared Based on a Cross-Shaped Resonator Structure
AbstractTo satisfy the marking demand for microwave absorbing devices, we design an ultra-broadband nearly perfect absorber. The proposed absorber demonstrates absorption band from long to very long-wavelength ranges (15.7 –37.9 µm). An average absorption efficiency of 95.16% and a satisfactory absorption bandwidth of 19.2 µm are achieved. The absorption with high absorptivity and large bandwidth is achieved through combined propagating surface plasmon (PSP) resonances in two directions and localized surface pla smon (LSP) resonances. By simulating and calculating the absorptivity, we demonstrate that the absorber po...
Source: Plasmonics - December 2, 2023 Category: Biomedical Science Source Type: research
Design and Modeling of a Novel Highly Sensitive Surface Plasmon Resonance Sensor Applying Tin Selenide and Graphene for Cancer Detection
AbstractA novel design of an optical biosensor based on surface plasmon resonance using tin selenide (SnSe) and graphene is presented. Including biological solutions, the performance of the obtained biosensor over a wide range of refractive index variations is promising. It is designed such that its key parameters are optimized to detect different cancerous cells with high selectivity and sensing ability. The design and analysis of the sensor have been carried out by implementing a finite element method –based simulation platform. The results revealed that the designed sensor can provide a sensitivity of 121.0 deg.RIUâˆ...
Source: Plasmonics - December 2, 2023 Category: Biomedical Science Source Type: research
Investigation of Antibacterial Activity and Wound Healing Promotion Properties Induced by Bromelain-Loaded Silver Nanoparticles
AbstractWith the demand for better chronic wound care, the clinical problem of managing wound infections has already reached a critical level. Therefore, the development of novel antibiotic-free wound dressings is essential for wound care. The proteolytic enzyme bromelain, silver nanoparticles (AgNPs), and bromelain loaded on silver nanoparticles (Br-AgNPs) were assessed for their impact on wound healing in the albino mice. The formulated nanoparticles were characterized using different techniques, i.e., ultraviolet (UV), Fourier transform infrared (FTIR), and X-ray diffraction (XRD) analysis. The antibacterial and fungal ...
Source: Plasmonics - November 23, 2023 Category: Biomedical Science Source Type: research
Highly Sensitive Photonic Crystal Fiber Biosensor Based on Surface Plasmon Resonance for Six Distinct Types of Cancer Detection
AbstractAn innovative photonic crystal fiber (PCF) biosensor using surface plasmon resonance (SPR) to diagnose six distinct kinds of cancers (skin cancer, cervical cancer, adrenal gland cancer, blood cancer, and breast cancer types 1 and 2) in cells is demonstrated here and incorporates with two microchannels and a bimetallic configuration. The numerical analysis utilizes the finite element method (FEM) combined with perfectly matched layers (PML). The plasmonic material employed in the biosensor is gold (Au), and a supportive material, titanium dioxide (TiO2), is combined with Au. By combining these two materials, the sen...
Source: Plasmonics - November 23, 2023 Category: Biomedical Science Source Type: research
Synthesis of Ciprofloxacin-Conjugated Gold Nanoparticles and their Study Antibacterial Effects on Growth Biofilm Formation Through Nebulizer Mask Against Respiratory Infection
AbstractAn efficient strategy involves the use of antibiotic-conjugated nanoparticles. This research primarily aimed to enhance the biosynthesis of gold nanoparticles by binding them with ciprofloxacin. We investigated the biological, optical, and structural characteristics of gold nanoparticles (AuNPs) and their combination with ciprofloxacin (CIP@AuNPs). We performed a number of analyses using Fourier-transform infrared (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and UV –VIS spectroscopy using a cost-effective pulsed-laser ablation technique (PLAL). The size and morphology of the nanopartic...
Source: Plasmonics - November 22, 2023 Category: Biomedical Science Source Type: research
Advances in Metallic-Based Localized Surface Plasmon Sensors for Enhanced Tropical Disease Detection: A Comprehensive Review
In this study, we focused on the connection between neglected tropical diseases (NTDs) and its risk using metallic-based LSPR sensors to identify potential inflammatory biomarkers. We conducted a literature search using PubMed, Web of Science, and Google Scholar. Only published materials written in English were considered, resulting in the identification of\(\sim\) 220 articles. After a comprehensive evaluation, we selected 35 relevant ones. Our analysis revealed 35 links to neglected tropical diseases, providing valuable insights into their relationship using metallic-based LSPR sensors. Moreover, we explore the potential...
Source: Plasmonics - November 21, 2023 Category: Biomedical Science Source Type: research
Polyethyleneimine-functionalized Silver Nanoparticles as SERS Substrates for the Detection of Chrysoidine
In this study, a mixture of silver nanoparticles (AgNPs) and polyethyleneimine (PEI) was used as the SERS substrate at room temperature for the rapid and sensitive detection of Chrysoidine in mirinda soft drink, and PEI could attract Chrysoidine to the hot spot region of the AgNPs and enhance its Raman signal. The characteristic peak of the SERS spectrum of Chrysoidine showed obvious SERS enhancement at 1180  cm− 1, and there was a good linear relationship between the SERS intensity and the concentration of Chrysoidine. The limits of detection (LOD) in both water and mirinda soft drink were determined to be 1.32  µg...
Source: Plasmonics - November 20, 2023 Category: Biomedical Science Source Type: research
SPR-Based Sensor for Colorectal Cancer Detection using Al –Cu and Graphene
AbstractIn this article, a surface plasmon resonance (SPR)-based refractive index sensor is proposed for the detection of colorectal cancer (CRC). The prism-based configuration has been employed to excite the surface plasmons (SPs). The structure of the proposed sensor consists of an Al –Cu bimetallic layer on the BK7 prism. To ensure contact between the metallic layer and the prism, an adhesive layer of TiO2 is used. Graphene layer is used above the bimetallic layer to improve its stability. In order to detect CRC, the healthy and infected tissues are utilized as the analyte media. The numerical simulations of the senso...
Source: Plasmonics - November 20, 2023 Category: Biomedical Science Source Type: research
