We observe the excitation and tuning of electromagnetically induced transparency (EIT) by interference between different pathways dark mode in a planar terahertz metamaterial. The EIT unit cell consists cut wire as bright resonator pair split ring resonators (SRRs) element. resonance is excited both electric magnetic fields when SRR translates along without altering lateral distance resonators. exciting allows for giant amplitude modulation resonance.

We describe the optical transmission properties of a surface plasmon polariton waveguide structure consisting metal-insulator-metal (MIM) and semicircular resonant cavity coupled with key-shaped cavity. Finite element algorithm simulated response MIM structure. The influence coupling length, geometrical size, asymmetry radius on Fano resonance line was investigated. Results demonstrate that variation leads to appearance dual resonances. When materials different refractive index fill in...

The applications of terahertz waves and metamaterials in electromagnetic wave absorbers are one the key focus areas current interdisciplinary scientific research. In this study, we propose a metamaterial absorber composed graphene double-open rectangular ring strip cross structures. experiment uses numerical analysis software to study proposed absorber. Transverse electric were normally incident on from plane port, where resonance coupling was achieved. With an increase incidence angle...

X-ray scintillator materials have attracted considerable attention due to their versatile and remarkable properties, leading advanced applications in science, information technology, biomedicine. In this review, we carefully...

In recent years, optical refractive index sensors have received significant attention in the field of chemical and biological sensing owing to advantages small size. order achieve requirements structure high sensitivity nano sensing, this paper proposes a Fano resonance–based waveguide which metal-insulator-metal (MIM) using surface plasmons U-shaped cavities are coupled unilaterally. The transmittance spectrum waveguide-coupled resonator with different incident light wavelengths can be...

Herein, a dual‐band tunable ideal absorber based on graphene array, and the dynamic tuning performance of perfect in terahertz band its sensing properties metamaterials are studied. The shows two absorption peaks at 1.01 1.86 THz, with an absorbance 99.5% 99.9%, respectively. With elevation angle range 0°–30° frequency 0.971–1.100 THz or 1.794–1.897 designed herein can achieve greater than 90%. Owing to superior graphene, band, bandwidth, relative bandwidth be achieved by adjusting Fermi...

Bisulfite, as an important additive in foodstuffs, is one of the most widely distributed environmental pollutants. The excessive intake bisulfite may cause asthmatic attacks and allergic reactions. Therefore, determination visual detection are very important. Herein, a newly designed hydrophilic indolium cycloruthenated complex, [Ru(mepbi)(bpy)2]+ [1; bpy = 2,2′-bipyridine Hmepbi 3,3-dimethyl-1-ethyl-2-[4-(pyridin-2-yl)styryl]benzo[e]indolium iodide (3)], was successfully synthesized used...

High efficiency and precision of the pot center detection are foundations avionics instrument navigation optics measurement basis for many applications. It has noticeable impact on overall system performance. Among them, laser spot is very important in optical technology. In order to improve low accuracy position, algorithm improved circle fitting. The pretreatment used by fitting, adaptive denoising filter TV repair technology can effectively improves position. At same time, de-noising...

Vegetable oil and animal fat residues are common evidence in the cases of homicide, arson, theft, other crimes. However, lipid composition content changes during aging on complex carriers remain unclear. Therefore, this study dynamically monitored 13 different types vegetable oils fats five using UPLC-Q-Exactive Orbitrap MS method. A total 6 subclasses 93 lipids including lysophosphatidylcholine (2 species), phosphatidylcholine diglyceride (5 triglyceride (81 acylGlcCampesterol ester...

The study of optical microcavity sensors in current micro electromechanical systems (MOEMS) devices is an important research direction this field. In study, a surface plasmon waveguide structure with MIM (Metal Insulator Metal), semi-circular resonator, and T-shaped resonator was examined. effects the coupling distance, geometrical size cavity its asymmetry, radius on Fano resonance spectrum were analyzed numerically. sensitivity refractive index sensor up to1066.67nm/RIU. detection water...

It is still challenging to investigate the effect of resonator defects on sensitivity and FOM improvement while maintaining sensor size constant. In this paper, we design a MIM waveguide structure coupled with spherical particles obtain higher power refractive index based The Mi scattering its extension theory. transmission characteristics plasmonic are numerically studied finite element method (FEM). simulation results display that multi-mode obtained by changing structural parameters...

AbstractMagnetic Fe3O4/graphene oxide nanocomposites were synthesised by a simple hydrothermal method. The morphology and composition of the magnetic optimised characterised ultraviolet–visible spectra, Fourier transform infrared zeta-potential scanning electron microscope. It was found that Fe3O4 nanoparticles with mean diameter about 15–30 nm firmly decorated on surfaces graphene oxide. presented an excellent colloidal stability over wide range pH. Furthermore, could be quickly separated...

Active control of electromagnetically induced transparency (EIT) using metasurfaces has attracted growing interests in recent years, especially the ones that have multiple EIT windows. Here, we give out a metallic metasurface design can achieve dual (D-EIT) terahertz (THz) regime, and propose strategy to individually simultaneously two windows by integrating graphene structures into design. The near-field simulations indicate physical mechanism lies composite effect conductive graphene....

Abstract Although surface‐enhanced Raman spectroscopy (SERS) has recently emerged as a powerful analytical tool, its widespread use is hindered by several inherent problems (e.g., low reproducibility) that need to be solved before further progress possible. Herein, we used dodecyltrimethylammonium bromide (DTAB), N ‐dodecyl‐ ‐2‐hydroxyethyl‐ , ‐dimethylammonium (C 12 HDAB), and ‐2‐dihydroxyethyl‐ ‐methylammonium DHAB) templates for the seed‐mediated growth of Au nanorods with different...

Gunshot residues (GSR), cartridge projectiles, and casings are frequently encountered evidence in gun-related forensic investigations. However, circumstances where the investigation of striation marks is impossible, such as unrecovered or deformed projectiles casings, GSR deposited on hands clothes shooter victim-related items can provide information to establish a link between suspect, firearms used, victim. Since formula primers used by all manufacturers China identical, links based...