A Biosensor for the Detection of Anemia Using Metal Ag and Defect Multilayer Photonic Crystal
AbstractHemoglobin in a blood sample has been analyzed for the diagnosis of anemia cancer in a human ’s body by using metal/defect/metal multilayer one-dimensional (1D) photonic crystals. The proposed structure contains five periodic layers of Si/BaF2 and a very thin defect layer of blood sample between two thin metal layers of Ag. In this case, a low concentration of hemoglobin in red blood cells (RBC) which is a function of refractive index indicates anemia cancer in the patient. The modification of the refractive index or concentration simply causes a shift in the transmittance of the defect mode in the photonic bandg...
Source: Plasmonics - October 13, 2023 Category: Biomedical Science Source Type: research
Ultrahigh Sensitivity Refractive Index Sensor Based on Surface Plasmon Resonance Effect of Double-Ring Hollow-Core Anti-Resonant Fiber
AbstractIn this paper, a refractive index (RI) sensor is presented on the basis of the surface plasmon resonance (SPR) effect of double-ring hollow-core anti-resonant fiber (DR-HC-ARF), which has great sensitivity and wide detection range. In the design, the DR-HC-ARF consists of 12 silica tubes in two layers inside and outside, with the X-forward inner silica tube filled with gold wire. The simulation results indicated that the achievable maximum sensitivity, minimum resolution, and largest figure of merit of the DR-HC-ARF sensor filled with gold wire are −20600 nm/RIU, 4.85 × 10−6 RIU, and 615.79 RIU−1, respective...
Source: Plasmonics - October 13, 2023 Category: Biomedical Science Source Type: research
Graphene-Based Cross-Shaped Surface Plasmon Resonance Solar Absorber Design for Solar Thermal Energy Converters
AbstractIn this demonstrated design, we built a perfect solar absorber, with three appropriate layers of base (tungsten) layer, substrate (aluminum), layer, and gold resonator in a cross-design. The absorption result of the demonstrated cross-design can be identified in three sections by dividing the whole wavelength range (2800 nm) into two sections the first 1400-nm bandwidth range (starting from 0.2 to 1.6 µm), and the second part of 1400 nm (between 1.6 and 3 µm) respectively. With the support of the adding graphene layer by developing the top and middle layer, the absorption percentage can be increased to 91% f...
Source: Plasmonics - October 12, 2023 Category: Biomedical Science Source Type: research
Numerical Simulation of Fiber Optic Biosensor Consisting of Metal/Sc2O3 Enhancing by Using Aluminum Alloy for Hydrotherapy Applications
AbstractWater purity plays a key role in medical applications such as clinical diagnosis, drug delivery, sterilization, and patient management. One of the most important medical treatments in which the quality of water is very important is hydrotherapy. Most of the patients have weakened immune systems due to existing infections, making them highly vulnerable to new infections from contaminated water in hydrotherapy pools. Therefore, the hydrotherapy water should be tested to ensure the safety of the patients ’ lives. In this research, a fiber optic bilayer sensor consisting of silver, copper, platinum, nickel, and gold ...
Source: Plasmonics - October 12, 2023 Category: Biomedical Science Source Type: research
Absorption Properties of a Defective Binary Photonic Crystal Consisting of a Metamaterial, SiO2, and Two Graphene Sheets
This study explores the absorption characteristics of a defective photonic crystal (PhC) in the GHz range. The PhC has the structure (SiO2/metamaterial)N/graphene/defect/graphene/(SiO2/metamaterial)N. The defect layer is considered as a SiO2 layer positioned between two graphene sheets. Transmittance, reflection, and absorbance are all investigated. The tunability of absorption characteristics is explored by varying the following parameters: the number of PhC periods, the chemical potential of graphene, the phenomenological scattering rate, and the thickness of the metamaterial layer. The results have shown that the number...
Source: Plasmonics - October 11, 2023 Category: Biomedical Science Source Type: research
Molecular Fingerprint Detection with a Mid-infrared Guided-Mode Resonance
AbstractGuided-mode resonance (GMR) is a compelling scheme for optical sensing of various physical quantities, which holds great promise in non-invasive detection of chemical and biological species. Current GMR sensors are mostly based on detection of environmental refractive index change, which presents a challenge for obtaining sensing selectivity as required in practical applications. In this work, we report on a prototype demonstration of using GMR for detecting molecular fingerprint absorption. In a waveguide grating made of a ZnSe layer sandwiched between a Cu film and an Au grating, a mid-infrared GMR is excited and...
Source: Plasmonics - October 10, 2023 Category: Biomedical Science Source Type: research
A Multilayered Infrared Optical Absorber Based on Epsilon-Near-Zero Metamaterials
AbstractIn this work, a perfect absorber with metal-ENZ-metal configuration at the wavelength of 1550 nm is presented. The epsilon-near-zero (ENZ) part is a multilayered structure consisting of Au–Ge-Si with a very thin thickness compared to the wavelength; therefore, its optical properties can be determined based on the effective medium theory (EMT) model, which is a homoge nization method based on field averaging. The thickness of the layers is adjusted so that the ENZ wavelength occurs at 1550 nm. A square array of nanoparticles is placed on the ENZ structure, which excites the surface plasmon polariton (SPP) at ...
Source: Plasmonics - October 10, 2023 Category: Biomedical Science Source Type: research
Wide-Angle Broadband Solar Absorber Based on Multilayer Etched Toroidal Structure
In this study, we propose a wide-angle broadband solar absorber based on multilayer etched toroidal structure. It is composed of a top layer Ti, W, and Si3N4 multilayer material, a silica insulator, and a Ti substrate. The average absorption from visible to mid-infrared wavelengths is 94.2%. The absorption bandwidth above 90% absorption is 3092 nm, and the peak absorption is 99.9%. The absorber achieves a perfect collection of incident solar energy caused by the combination of the local surface plasma resonance at the top layer of this absorber and the propagating plasma resonance in the lower insulator layer. The results ...
Source: Plasmonics - October 9, 2023 Category: Biomedical Science Source Type: research
Plasmon Hybridization of Au Hollow Nanocone Array for SERS Sensing
AbstractSurface-enhanced Raman scattering (SERS) spectroscopy plays a vital role in highly sensitive fingerprint detections and non-invasive point-of-care diagnostics. However, elaborate fabrication of a compact nanostructure-based plasmon hybridization to realize high-sensitivity SERS-active substrate remains a challenge. In this work, an Au hybrid hollow nanocone SERS substrate is successfully fabricated by ion-track technology. The overall electromagnetic enhancement is developed due to the synergistic effect of merging individual nanostructures onto one three-dimensional Au hybrid hollow nanocone SERS substrate. The ne...
Source: Plasmonics - October 8, 2023 Category: Biomedical Science Source Type: research
D-Shaped Microfluidic Channel Bimetallic with a Highly Sensitive SPR RI Sensor for a Large Detection Range
AbstractA highly sensitive D-shaped microfluidic channel (MFC) incorporated in a single-mode fiber (SMF) equipped with a tungsten trioxide (\(WO_{3}\)) layer coated with gold (Au) or silver (Ag) on the base of the MFC is designed and investigated utilizing a finite element method (FEM) to obtain the sensing performance of the optical fiber surface plasmon resonance (SPR) structure. The proposed sensor is appropriate for both bimetallic layers and analytes. With the sizeable cladding diameter of SMF, the fluidic channel size can be changed following demand, making fabrication more accessible and applicable. The hollow D-sec...
Source: Plasmonics - October 7, 2023 Category: Biomedical Science Source Type: research
Optical Properties and Photothermal Conversion Characterization of TiN Nanofluids with Different Base Fluids
AbstractOptimal optical absorption properties are imperative for the utilization of nanofluids in solar energy applications. Excellent optical absorption facilitates the augmentation of solar energy utilization efficiency. The base fluid contributes significantly to the optical properties of the nanofluid. However, the effect of base fluid on the nanofluid optical properties has yet to be explored. This work investigates the effect of three base fluids, deionized water, ethylene glycol, and 1,2-propanediol, on the optical absorption properties of titanium nitride (TiN) nanofluids. The results show differences in the optica...
Source: Plasmonics - October 6, 2023 Category: Biomedical Science Source Type: research
Folic Acid Conjugated CuS Nanoprisms for Cancer Targeting and Photothermal Treatment
AbstractIn this research, novel copper sulfide (CuS) nanoprisms with high surface area were prepared by two-phase colloidal method. The CuS nanoprisms were modified with folic acid as targeting molecules and used in cancer treatment as photothermal agent using NIR laser. FTIR analysis confirmed that the CuS have been synthesized and the FA was successfully conjugated the CuS nanoprisms. From UV –visible characterization, the prepared CuS nanoprisms have an absorption spectrum with two peaks appeared at UV–visible and near infrared region. The peak at UV–visible range greatly reduced when the folic acid conjugated CuS...
Source: Plasmonics - October 6, 2023 Category: Biomedical Science Source Type: research
High-Sensitivity Triple-Band Absorber Based on Graphene Rectangular Split Ring Resonator and Cross-structure
AbstractIn this paper, a triple-band absorber based on a rectangular split ring resonator and cross-shape graphene structure is achieved. The proposed absorber can achieve perfect absorption at 3.61 THz, 4.61 THz, and 5.86 THz, with absorption efficiency of about 97.8%, 99.3%, and 98.6% at the three peaks. Results show that the perfect absorption effect is originated from the surface plasmon resonance (SPR) of graphene metamaterial. An equivalent circuit model is presented, reveals the absorption peak, and absorption efficiency are related to the resistor of graphene. The absorption peaks can be independently tuned by chan...
Source: Plasmonics - October 5, 2023 Category: Biomedical Science Source Type: research
Plasmonic Copper: Ways and Means of Achieving, Directing, and Utilizing Surface Plasmons
AbstractCopper has been reclusive with regard to its plasmonic investigations among the founding plasmonic metals. With the advent of technology and the associated improvements in understanding of plasmonics, copper has been able to make a stand for itself among its peers and even outshine them in a few aspects such as dielectric loss, cost, and a more intricate and facile tuning of the near and far field intensities of the plasmon-enhanced distributions. This review is aimed at highlighting the different classes of plasmonic copper (PC), ranging from its pristine version to the array of composited and alloyed compositions...
Source: Plasmonics - October 5, 2023 Category: Biomedical Science Source Type: research
Correction to: A Sensitive Biosensor Based on Plasmonic ‑Graphene Configuration for Detection of COVID‑19 Virus
(Source: Plasmonics)
Source: Plasmonics - October 5, 2023 Category: Biomedical Science Source Type: research
