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
Comparative Analysis of Different Dielectric Buffer Layer in a Highly Sensitive Long-Range Surface Plasmon Resonance Imaging Sensor Having PtSe2 and Heterostructure of BlueP/MoS2
AbstractThis manuscript presents a Kretschmann configured long-range surface plasmon resonance (LRSPR) imaging sensor (structure: 2S2G prism-MgF2-Ag-PtSe2-BlueP/MoS2-SM) demonstrating ultrahigh imaging sensitivity,SImg. (23,250 RIU−1); detection accuracy, DA (50 Deg.−1); angular figure of merit, FoMAng. (1930.87 RIU−1); imaging figure of merit, FoMImg. (1,162,500 Deg.−1 RIU−1); and better penetration depth, PD (1129.4 nm), for sensing of biomolecules. The MATLAB and COMSOL simulation software are used for numerical analysis of the results. The effect of different dielectric buffer layers, DBLs (MgF2, LiF, Cytop&a...
Source: Plasmonics - November 18, 2023 Category: Biomedical Science Source Type: research
Evaluation of Plasmonic Optical Heating by Thermal Lens Spectroscopy
AbstractThis work reveals the rules of using figures of merit on selecting efficient plasmonic nanoheaters. Here, a size dependence of plasmonic nanoparticle optical heating was disclosed. The continuous laser heating of gold nanospheres is evaluated exploring a theoretical approach and thermal lens spectroscopy, which allowed identifying micro-degree temperature changes of laser heated colloidal gold nanospheres of varying sizes. Our findings indicate that the temperature of photoheating colloidal particles rises according to the Joule number values. The optimal gold nanospheres diameter for efficient colloidal laser heat...
Source: Plasmonics - November 15, 2023 Category: Biomedical Science Source Type: research
Correction to: Plasmonic Modes of Metallic Slab in Anisotropic Plasma Environment
(Source: Plasmonics)
Source: Plasmonics - November 14, 2023 Category: Biomedical Science Source Type: research
Simulation of a Sensitive Mid-infrared (MIR) D-Shaped Optical Fiber Water Pollutant Sensor
AbstractIn this work, an efficient optical sensor is proposed for the sensitive detection of various pollutants in water. The suggested optical sensor is based on an indium fluoride (InF3) glass fabricated as a D-shaped optical fiber. The polished surface of the D-shaped fiber is coated with a gold grating to induce the surface plasmon resonance (SPR). The SPR depends on the optical properties of the polluted water analyte in physical contact with the grating. The proposed optical SPR fiber sensor operates within the mid-infrared (MIR) range (3000 –4500 nm) to detect any slight change in the water refractive index (RI) ...
Source: Plasmonics - November 11, 2023 Category: Biomedical Science Source Type: research
Exploring Plasma-Induced Transparency: Coupling Plasmonic Waveguides with Resonators for Innovative Nanophotonic Applications
AbstractA novel plasmonic structure is proposed to achieve plasmon-induced transparency (PIT), which is composed of a stub resonator (SR) and a square ring resonator (SRR). The research delves into the theoretical calculations and numerical simulations to explore the formation and evolution mechanisms of PIT. In this innovative structure, the evolution of PIT is notably influenced by geometric parameters, and its sensing performance in various environments is thoroughly examined. Furthermore, the study evaluates its potential applications in the domains of slow light and optical switches. Moreover, the introduction of an a...
Source: Plasmonics - November 10, 2023 Category: Biomedical Science Source Type: research
Thermally Switchable Metasurface for Controlling Transmission in the THz-gap
AbstractThis paper presents a metasurface (MS) providing single to dual transmission frequency bands under different thermal excitation conditions. Vanadium dioxide (VO2) has been incorporated into a metallic MS design to generate a switching feature under temperature variations. The proposed VO2-based MS offers dual band transmission responses at 1.4 THz and 2.66 THz at room temperature (300 K). The same structure exhibits single band transmission response at 1.4 THz by rejecting the higher band, when the VO2 layer is acting as a metal under thermally heated condition (above 340 K). The device is polarization-insensitive ...
Source: Plasmonics - November 8, 2023 Category: Biomedical Science Source Type: research
The Polarization of Plasmonic Field and Depolarization Factor for The Ellipsoid in Semiconductor Quantum Dot-metallic Nano Ellipsoid System
AbstractWe theoretically study the polarization of plasmonic fields in a hybrid nanosystem composed of three different metallic nano ellipsoid and a semiconductor quantum dot. The components of the hybrid nanosystem interact with three electromagnetic fields and one another via dipole-dipole interactions. We derive the density matrix equations at a steady state for the description of the optical properties of the hybrid nanosystem. The polarization of the plasmonic fields induced on the prolate, spherical, and oblate nano ellipsoid is calculated. We find that the polarization of the plasmonic fields depends on the number o...
Source: Plasmonics - November 4, 2023 Category: Biomedical Science Source Type: research
