Optical wavelengths considered as the key source of electromagnetic waves from the sun, and metamaterial absorber (MMA) enables various applications for this region like real invisible cloaks, color imaging, magnetic resonance imaging, light trapping, plasmonic sensor, light detector, and thermal imaging applications. Contemplated those applications, a new wide-angle, polarization-insensitive MMA is

A numerical solution, using the general formulation of the transcendental equation and eigenmode values, is proposed to demonstrate number of strongly guided modes propagating in sapphire crystal fibers (SCF). The SCF is considered to have hexagonal geometry of a single crystal and multimode step-index profile. Several distinguished characteristics are naturally embedded in SCF compared to other ordinary

A tunable multiwavelength fiber laser (MWFL) based on bidirectional semiconductor optical amplifier (SOA) in conjunction with a Sagnac loop mirror (SLM) interferometer is proposed. The best multiwavelength spectrum from this setup produces 164 lasing lines within 3 dB uniformity. The main study is to investigate the multiwavelength laser performance by varying the polarization state (PS) at two different

Soliton solutions of couple of nonlinear evolution equations (NLEEs) ascending for voltage analysis in nonlinear electric transmission lines and electric signals in telegraph lines have been investigated through the modified simple equation (MSE) method. We establish general closed form soliton solutions associated with transmission line parameters and integral constants, for definite values of which

A Theory is presented to construct several types of self-trapping nonlinear modes in the two-dimensional model of binary Bose-Einstein condensate (BEC) with the repulsive dipole-dipole interaction (DDI) and the spatially confined spin-orbit coupling (SOC). The spatially confined SOC can be induced by illuminating spinor BEC with a Gaussian beam. It is found that the two-dimensional SOC of Rashba type

Recently, an approximate solution of the quadratic nonlinear oscillator has been presented based on the harmonic balance method. According to this method a set of nonlinear algebraic equations appear among the unknown coefficients of the several harmonic terms. Moreover, all these algebraic equations have no analytic solutions and sometimes no real solution can be found. In this article, a simple form

The present work discusses the basic features of bifurcation properties with chaotic motion of oblique plane wave in the discrete nonlinear electrical transmission lines having conformable derivative evolution. The planar dynamical systems are obtained to understand such physical issues for this model. In addition, the analytical plane wave solutions of nonlinear mathematical leading equation are determined

The tensor analyzing power component, T20, of the γd→→π0d process in the photon energy range from 200 to 400 MeV is investigated. This work is motivated by the most recent and unique measurements from the VEPP-3 electron storage ring at the Budker Institute of Nuclear Physics in Novosibirsk, Russia. We point out a special sensitivity of T20 to the elementary γN→πN amplitude and to the realistic NN

We propose and numerically analyze a kind of terahertz (THz) phase-shifted gratings based on circularly symmetrical subwavelength waveguides. The filtering principle lies in that through introducing periodically structural disturbance to the subwavelength dielectric wire along the THz wave propagation direction, the coupling response are inspired. By modifying the central period unit to introduce a

Although quantum coherence is a well known phenomenon in quantum information theory and quantum optics, it has been investigated from the resource theory perspective only recently. Furthermore, quantum coherence has important implications in relativistic quantum information where the degradation of entanglement can be attributed to decoherence. In this paper, we investigate the quantum coherence of

The effects of silicone oil viscosity (SOV), carbonyl iron particles (CIPs) weight fraction and size on the yield dimensionless magnetic effect (DME) and shear-thinning behavior for magnetorheological (MR) grease were experimentally investigated in this study. Nine MR greases were prepared using Taguchi L9 orthogonal array based on an unconventional synthesis technique. The yield DME, namely the controllability

In this paper, we solve the conformal time-fractional Klein-Gordon equation with high-order nonlinearities via the complete discrimination system for polynomial method, namely with the quadratic and cubic nonlinearities. Our results contain all the existing solutions, and some new exact solutions such as Jacobian elliptic function solutions, are also presented. Moreover, to ensure the existence of

The aim of this comment paper is to discuss an incorrect approach in the investigation of the optical properties which has been presented in a published article. Also, it is pointed out that some of the reported results in the original work are erroneous.

In this work, analytical approximate progressive wave solutions for the generalized form of the nonplanar KdV-Burgers (KdV-B) and mKdV-Burgers (mKdV-B) equations are presented and the results are discussed. Motivated with the exact solutions of the planar KdV-B and mKdV-B equations, the weighted residual method is applied to propose analytical approximate solutions for the generalized form of the nonplanar

In this paper we studied the time-dependent viscous uid ow due to a rotating stretchable disk. Fluid filling porous medium. Darcy's law is used for description of porous medium. Moreover, the effect of chemical reaction and heat generation/absorption are considered in concentration and temperature equations respectively. Governing PDE's system is reduced to dimensionless form by appropriate parameters

In this paper, the Zakharov (Z.) equation in the dimensionless form is numerically investigated via (Cubic & Quantic & Septic) B–spline schemes to demonstrate the fidelity of the calculated computational solutions. The Z equation depicts the interaction in plasma between (high & low) frequency of (Langmuir & ion–acoustic) waves. This interaction is expounded in the prompts of the coastal engineering

The current work intends to investigate the magneto-hydrodynamic peristaltic flow of a non-Newtonian fluid through a tapered asymmetric channel. The transport of fluid with variable transport properties (viscosity and thermal conductivity) takes place through a porous medium. The problem is formulated under the basic assumptions of long wavelength and low Reynolds number. The perturbation technique

Memristor device opens a new pathway for artificial synapses in the neuromorphic system. In this work, we demonstrate the enhanced memristive and synaptic charactersitcs in SnO2-based memristor device with a thin amorphous zinc tin oxide (α-ZTO) film and TiON interlayer that is confirmed by X-ray photoelectron spectroscopy (XPS) analysis. A more linear and symmetric long-term potentiation (LTP) and

In the present paper, we report on the investigation of thermal annealing (TA) effect on structural and optical properties of crystalline silicon nanowires produced by metal-assisted chemical etching approach. In particular, the impact of TA on nanowire length, relative volume and size distribution of voids is described in terms of Lifshitz-Slyozov-Wagner theory considering the TA induced Oswald ripening

We report a novel high-pressure cubic cF24 phase of TaSi2 which is stable above 185 GPa through first-principles swarm intelligence structure search method. Results on enthalpy difference show that the structural transition of TaSi2 from the ambient hexagonal C40 phase to cF24 phase is first order with a volume drop of 4.1%. Under compression, the formation of cubic cF24 phase originates from the dramatic

High permittivity and low loss tangent polymer matrix composites containing a low loading of filler are desirable for practical applications in modern electronic devices. In this work, greatly improved dielectric properties of poly(vinylidene fluoride) (PVDF) were accomplished by incorporating high–permittivity Na1/3Ca1/3Bi1/3Cu3Ti4O12 (NCBCTO) ceramic particles with sizes of ~0.5–1.5 μm coupled with

We present a design of programmable terahertz (THz) metamaterial (PTM) with multiple logic characteristics. The proposed PTM device is composed of a cut-wire resonator (CWR) sandwiched two face-to-face split-ring resonators (SRRs). By moving CWR along z-axis direction to change vertical distance between CWR and substrate, the programmable coding digits could be switched from four digits to five digits

In this paper, a double-band visible-infrared photodetector absorber is proposed, which consists of a modified microbolometer and a metallic reflective layer which has a deep well. The simulated results show that the absorber proposed has high absorption peaks both at visible band (400–800 nm) and infrared band (8–12 μm), and the absorptivity at infrared band is more than 85% while the absorption rate

In this paper, we propose a metamaterial perfect absorber (MPA), which is a three-layer structure composed of a periodically placed “ǂ” type graphene array on top of a gold layer separated by a SiO2 dielectric spacer, to achieve dual band perfect absorption. The absorption mechanism is analyzed, and the simulation results show that at the frequencies of 5.16 THz and 10.30 THz, the absorption rates

We report a novel mode modulator based on a KTN crystal waveguide produced by femtosecond laser (fs-laser) writing. The KTN waveguide is a typical dual-line structure that depends on the decrease of refractive index at the focus area. The propagation loss of the waveguide along the TE polarization is as low as ~0.9 dB/cm at 632.8 nm. The investigation of confocal micro-Raman spectra reveals that the

In this paper, a gold-coated photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) technology is proposed through comprehensive numerical analysis for detection of numerous biological and biochemical analytes. The proposed sensor is designed with a simplified hexagonal geometrical structure for ease of fabrication process. Also, to facilitate the ease of sensing and real-time

Silica antireflection coatings from sol-gel processes are of great importance in optical areas because of their capability to reduce light reflection and hence to increase transmission. However, it retained a challenge to enhance the mechanical durability of the sol-gel antireflection coatings. One option is to introduce strong chemical bonding between neighboring silica nanoparticles in the coatings

A metamaterial design and its analysis based on an epsilon negative concentric crossed-line split ring resonator (CCSRR) have been presented in this paper. The CCSRR unit cell structure is the amendment of the typical concentric split ring resonator (CSRR). The inserted crossed line increases the electrical length of the presented CCSRR unit cell. The dimension of the proposed CCSRR unit cell is 10 × 10 × 1

We propose theoretically a tunable circular Bragg microcavity to enhance the intensity of the emission band of interest in rare-earth-doped materials and to suppress the unwanted emission bands which produce noise and diminish the efficiency of the emission band of interest. The surrounding of the microcavity comprises of alternating layers of high-index and low-index materials. The luminescent ions

We introduce a theoretical research of the Goos-Hänchen (GH) and Imbert-Fedorov (IF) shifts for the rotating elliptical Gaussian beams (REGBs) incidencing on a weakly absorbing semi-infinite medium. We show that the rotation ellipse parameters a, b and c are related to the occurance of giant spatial GH and IF shifts in the elliptical polarization. A comparison with the IF shift for p-polarization is

In this paper, a cross coupled interlinked split ring resonator based (CCI-SRR) based metamaterial has been presented. Epsilon negative (ENG) with a highly effective medium ratio (EMR) is attained in this metamaterial. The metamaterial unit cell consists of one square shaped split ring resonator and two rectangular rings. The rectangular rings reside within the outer square split ring. Two internal

The ductile Al in the Ti-Al Laminated Composites has a significant influence on their microstructure, distribution of internal stress, mechanical properties, failure modes and so on. This paper is mainly focused on the effects of the ductile Al on the ballistic limit velocity, the penetration process, the crack propagation, and the energy change of the Ti-Al3Ti targets by using finite element analysis

A Faraday fiber-optic current sensor with suppression of excess noise produced by a low-coherent light source is presented. The sensor is designed to detect short current pulses and represents an in-line interferometer with a sensing element based on a spun highly birefringent fiber. To suppress the excess noise, a two-channel light detection scheme without an additional delay line is applied. It is

A SnO2 varistor which was prospected to be used in ultra-high voltages grids as an overvoltage protection element was developed. The SnO2 varistor was doped with Cr to improve the comprehensive electrical properties. The optimal electrical parameters are achieved when the dopant of Cr is 0.05 mol% in this article. The voltage gradient of the varistor with Cr 0.05 mol% dopant is 787 V/mm, the nonlinearity

To reduce specific on-resistance (Ron,sp) of power devices, a novel SOI (silicon-on-insulator) trench gate LDMOS with heavily doping L-shaped P/N pillars and vertical dual-trench-gates is proposed in this paper, and its physical mechanism and electrical performance are investigated by numerical simulation. The L-shaped P-pillar raises the optimal doping impurity concentration of the drift region (Nd)

Fan-out wafer-level packaging (FOWLP) has been developed as an enhancement of standard wafer-level packaging solutions and is being intensively researched nowadays. However, issues of delamination remain unsolved. This study focuses on the interfacial characteristics between polyimide (PI) and redistribution layers (RDL) of the FOWLP to decrease the concerns in delamination. The problems of delamination

The plasma refraction index can be calculated by different methods. In this paper, a physical approach is presented and applied to non-linear situations. We have particularly focused on the case where the mass of the electrons subjected to the wave becomes relativistic. In the case of a circularly polarized high intensity wave, ionization is considered.

In this paper, coupled ring split-ring resonator (CR-SRR) based epsilon negative (ENG) metamaterial with high effective medium ratio (EMR) is designed and investigated for microwave applications. The metamaterial unit cell is a modification of the conventional split-ring resonator, which consists of three major outer split rings with two face to face horizontal E segments placed at the center. All

This letter deals with the derivation and analysis of a seventh-order generalization of the Hénon-Heiles potential. The new potential has axial and reflection symmetries, and finite escape energy with three channels of escape. Based on SALI indicator and exits basins, the dynamic behavior of the seventh-order system is investigated qualitatively in cases of bounded and unbounded movement. Moreover

At relatively high temperatures, the state-of-the-art of the diatomic liquid phononic theory applied to supercritical fluids shows that there exists discrepancies between the theoretical predictions and the experimental data. To overcome this difference, a new formulation of the rotational energy of single molecules that considers the thermal effect upon their moment of inertia, is presented. For a

Four new sp3-hybridized silicon allotropes (Si10, Si14, Si20-I, and Si20-II) in the space groups of P21/m and P2/m were developed in this study. Their values for properties related to stability, and mechanical, electronic, and optical properties were investigated using the first-principles method. Compared with most previously predicted and synthesized silicon phases, these allotropes exhibit lower

The linear wave augmented plane waves method at full potential using the functional density theory and applying the approximation methods “GGA-PBE, PBE-sol, mBJ and GGA + U” has been used to investigate the electronic, thermoelectric, magnetic and transport properties of Full-Heusler Fe2MnSi. The optimized and the most stable crystal structure at equilibrium is face-centered cubic with space group

The paper primarily aims to examine the fractional effect and explore the impact of temperature-dependent properties and primary stress on reflecting plane and secondary vertically waves using the three-phase-lag model (THPL). Its problem has been formulated by neglecting the body force and external heat source and having initial stress and temperature-dependent under THPL theory in its fractional

Analysis of an unsteady two-dimensional magnetohydrodynamic stagnation point flow of second-grade fluid is carried out in this article. It is supposed that the fluid is incompressible and impinges over the oscillatory stretching surface obliquely. The governing PDEs for second-grade fluid have been derived and then transfigured into a system of nonlinear coupled ODEs via appropriate similarity mappings

We report on the theoretical investigation and optimization of optical coupling performance between Si3N4 waveguide and Ge-based waveguide via an amorphous GexSi lateral linear taper. Different compositions of the amorphous tapers including amorphous Si (0% Ge), amorphous Ge0.60Si0.40 (60% Ge), and amorphous Ge0.83Si0.17 (83% Ge) are investigated over various telecommunication wavelength values of

In this paper, a proper concept of a kind of photonic crystal fiber known as D-shaped PCF sensor based on SPR or Surface Plasmon Resonance phenomenon has been discussed. The analysis has been performed numerically using FEM or Finite Element Method and PML (Perfectly Matched Layer) boundary conditions. Modal analysis has been performed keeping the smallest mesh as possible. The main mechanism of the

A convenient for practical use new theoretical approach describing a nonlinear frequency response of the multi-resonant nonlinear ring cavities (RC) to an intense monochromatic wave action is developed. The approach closely relates the many-valuednesses of the RC frequency response and the dispersion relation of a waveguide, from which the cavity is produced. Arising of the multistability regime in

Steady airflow over the wing of an aircraft in-flight is critical to achieving maximum aerodynamic performance. However, commercial flight routes are most times characterized by fluctuations in the airflow properties. The unsteadiness in the air velocity vectors and mass flow directly affects the aerodynamic efficiency (AE) of the aircraft during flight and could lead to air accidents. These correlations

In this study, CdxZn1-xS/PVA nanocomposites have been grown within polyvinyl alcohol (PVA) polymer matrix using the combined sorption of the cations by the successive ionic layer adsorption and reaction (SILAR) method. The effects of the different amount of Cd2+ and Zn2+ ions depending on the × value in CdxZn1-xS, the number of reaction cycles, various cation sources, and the different reaction parameters

The phase change process is of significant importance in the application of phase change material (PCM). In this paper, the natural convection melting in a square cavity was investigated and the enthalpy-based lattice Boltzmann model (TLBM) combined with the pseudo-potential LB model was developed to trace the solid–liquid interface. Four cases with different boundary conditions were calculated and

In this article, we proposed an efficient method to solve the delay Fractional Bagley-Torvik equation. The proposed method is capable of reducing the volume of the computational work as compared to the classical techniques while still maintaining the high accuracy of the numerical result; the size reduction amounts to an improvement of the performance of the approach. Our concern was to provide an

This study investigated changes in the interaction of B-type non-stoichiometric nanocrystalline carbonate-substituted hydroxyapatite (nano-CHAP) with polar amino acids (AA) with respect to CHAP-AA linking. Molecular vibrational spectroscopy revealed for the first time that the surface interaction of polar amino acids with defective nano-CHAP is determined not only by the charge state of AA but can

In this study, a bilayer HfO2/ZrO2 thin film structure was deposited by radio frequency sputtering at room temperature (RT) to investigate the resistive switching (RS) characteristics, mechanism as well as their reproducibility. Bilayer HfO2/ZrO2 structured device > 103 DC switching cycles at RT, and > 10 ON/OFF ratio. The RS uniformity and mechanism were evaluated by Gaussian data fitting and distributions

In this article, two different fifth-order nonlinear evolution equations (NLEEs), namely the (2+1)-dimensional bidirectional Sawada-Kotera (bSK) and the (2+1)-dimensional variable-coefficient Sawada-Kotera (SK) equations are investigated, whose generous exact solutions are formally generated, respectively. The paper proceeds step-by-step with increasing detail about derivation processes, first illustrating

Multiple-band perfect light absorber using new type of metamaterial resonator consisted of a metallic split ring embedded with a rectangle patch is designed in this paper. Four terahertz absorption peaks with narrow line-widths, large absorption coefficients, and discrete resonance frequencies are realized. The combined effect of multiple localized modes of the designed metamaterial resonator results

In this paper, the supercontinuum generation in an optical fiber with forward and backward Pearcey-Gaussian pulses near the zero-dispersion wavelength is investigated. By using the split-step Fourier transform to solve the generalized nonlinear Schrödinger equation (GNLSE), we have shown an interesting phenomenon that the spectrum bandwidth of the forward Pearcey-Gaussian pulse is broader than that

We theoretically investigate structural stability, electronic and thermal characteristic of boron and nitrogen codoped monolayer graphene using density functional theory and Boltzmann transport equation. Three types of BN dimers, ortho, meta, and para dimers, are identified at different concentration ratios of B and N atoms. Our DFT calculations suggest that the BN ortho dimers are structurally favorable