We report observation of electric-field-modulated infrared absorption at room temperature in electrochemically self-assembled CdS quantum dots produced by electrodepositing the semiconductor 50-nm pores an anodic alumina film. The is associated with photoassisted real space transfer electrons from to surrounding trap sites alumina. Similar was observed past [Appl. Phys. Lett. 79, 4423 (2001)] and basis a near photodetector. An electric field modulates this altering overlap between...

A stochastic finite-difference time domain (S-FDTD) combined with the piecewise linear recursive convolution method is applied to model wave propagation in unmagnetized plasma random frequency. The stretched-coordinate perfectly matched layer implementation of S-FDTD also presented. accuracy and efficiency proposed algorithm are validated by numerical examples.

We present an unconditionally stable weighted Laguerre polynomials (WLPs)-based finite-difference time-domain (FDTD) algorithm for modeling wave propagation in isotropic cold plasma. The plasma effects contributed by electrons and collisions are modeled current density vectors collocated with the electric field components. factorization-splitting scheme is employed to translate large sparse matrix equation conventional WLP-FDTD into two six tri-diagonal ones 2-D 3-D problems, respectively....

We present the electron dynamics manipulation of laser induced periodic nanoripples on fused silica via a train shaped femtosecond pulses. The non-linear ionization used for supporting surface plasmon polaritons (SPPs) is taken into account in analysis ripple dynamics. It revealed that periods are closely related to both pulse-to-pulse separation and fluence. result attributed ultrafast SPP dispersion wavelength through unusual arising This study should be helpful fundamental understanding...

In this paper, a 3-D stochastic finite-difference time-domain algorithm is developed for simulating wave propagation in isotropic cold plasma medium by using the bilinear transform (BT) technique. The proposed has simple formulation and very easy to apply dispersive material. It efficiently calculates mean value standard deviation of electromagnetic field components caused variability or uncertainty plasma's electron density collision frequency. stretched coordinate perfectly matched layer...

A stretched-coordinate (SC) based complex-frequency-shifted perfectly matched layer (CFS-PML) is presented for the two-dimensional Weighted-Laguerre-polynomials (WLP) finite-difference time-domain (FDTD) method. The proposed CFS-PML background medium independent, and can be easily extended to dispersive medium. Numerical examples show effectiveness of in truncating both air

We previously developed a tri-diagonalized finite-difference time-domain (FDTD) algorithm based on the weighted Laguerre polynomials (WLPs) for modeling wave propagation in magnetized plasma. The demonstrated dramatic CPU time reduction comparison with original WLP-FDTD algorithm. However, splitting error was caused owing to additional perturbation term. In this paper, an iterative scheme is introduced further reduce error. Numerical example shows accuracy and effectiveness of proposed

This study investigates a nine-layer multi-functional periodic array with active broadband tuning in the terahertz (THz) band. The device comprises symmetrical vanadium dioxide (VO 2 ) films and polypropylene (PP) layers, along silicon (SiO hybrid-patterned metasurfaces, central VO layer. Through detailed analyses of electric field distribution, equivalent circuit, effective impedance, we have performed thorough investigation resonance modes present meticulously optimized various parameters....

The use of total-field/scattered-field (TF/SF) technique to excite plane waves is extended anisotropic layered media. A split-field form one-dimensional (1-D) auxiliary finite-difference time-domain (FDTD) method proposed generate the incident fields required by technique. enables separate discretization field components that propagate in direction either parallel with or perpendicular planar interface during derivation 1-D FDTD. Simulation results show maximum leakage errors into...

<title>Abstract</title> Objective This study sought to enhance the precision of endometrial lesion categorization in ultrasound imagery via a data enhancement framework base on deep learning (DL), addressing diagnostic accuracy challenges and contributing future research. Materials Methods Our gathered image datasets from 734 patients across six hospitals. We devised including Image Features Cleaning Soften Label, validated multiple DL models ResNet50, DenseNet169, DenseNet201, ViT-B. For...

An efficient stochastic finite-difference time-domain (S-FDTD) with weighted Laguerre polynomials algorithm is presented for calculating the standard deviation of electromagnetic fields caused by variability or uncertainty isotropic cold plasma materials in a single run. Compared conventional S-FDTD method, proposed uses an implicit marching-on-in-degree scheme, which improves computational speed significantly. The perfectly matched layer complex-frequency-shifted factor implemented via...

An unconditionally stable stochastic finite-difference time-domain (S-FDTD) with weighted Laguerre polynomials algorithm is proposed to model wave propagation in isotropic cold plasma random media. The mean value and the variance of field components as caused by variability or uncertainty electrons collisions are calculated a single run. In addition, perfectly matched layer implemented via formulation stretched-coordinate system. Numerical example validates accuracy efficiency algorithm.

We present the state-of-art polymer-based electro-optic modulator, which, for first time, can be used in real commercial systems. The devices work up to 100 Gbps and possess Vpi as low 1.6 V.

The “magnetic window” is considered to be an effective technique for alleviating a vehicle's atmospheric reentry blackout, whereas the dynamic variation characteristic of plasma sheath critical communication. In this article, effects on electromagnetic wave propagation and bit error rate (BER) two typical modulation signals under external magnetic field are investigated. First, hybrid matrix method used calculate transmission coefficients right-handed circularly polarized (RHCP) waves with...

A stretched-coordinate (SC) based perfectly matched layer (PML) is presented for the weighted Laguerre polynomial finite-difference time-domain (WLP-FDTD) method. Compared to split-field PML, new SC-PML easy combine with a complex-frequency-shifted (CFS) factor improve PML efficiency. The proposed also background material independent. Numerical examples show effectiveness of algorithm.

In this work, a 3-5 μm mid-infrared broadband perfect absorber is proposed. The proposed only composed of an aluminium oxide (Al2O3) dielectric layer on the top, silicon (Si) with embedded titanium (Ti) ring in middle and high loss metal substrate. It exhibits extremely absorption performance entire range band, highest average rates 99.91% 98.57%, respectively. excellent at attributed to intrinsic two dielectrics excitation surface plasmon resonance (SPR). Moreover, rate can be still...

Ultrasound imaging is the preferred method for early diagnosis of endometrial diseases because its non-invasive nature, low cost, and real-time features. However, accurate evaluation ultrasound images relies heavily on experience radiologist. Therefore, a stable objective computer-aided diagnostic model crucial to assist radiologists in diagnosing lesions.Transvaginal were collected from multiple hospitals Quzhou city, Zhejiang province. The dataset comprised 1875 734 patients, including...

We have developed a model of frequency modulated distributed feedback laser with intracavity phase modulator and shown that it can operate in two different regimes, only one which has good frequency-modulated (FM) response. identified the combination parameters forces to high FM efficiency regime. The results our initial experiments support these conclusions.

This letter presents a modified stochastic finite-difference time-domain (S-FDTD) method and its perfectly matched layer (PML) implementation. In the algorithm, electric field variance equation is derived from D-H form. By using bilinear Z transform, algorithm applicable for different types of dispersive materials. Based on stretched coordinate (SC) system, PML implementation also proposed. Numerical examples are presented to show effectiveness proposed method.

Electro-optic (EO) polymer modulators have demonstrated high speed external modulation of optical signals. Additionally, EO polymers closely matched refractive indices at and microwave wavelengths, which enables bandwidth operation. An includes a matrix an organic "push-pull" chromophore that can be modified to give poled with activity. This activity optical-microwave velocity match offer the promise accomplishing broadband, low drive voltage. Such signal is critical for applications in...

For laser beam steering, a pure optical-electric system without mechanical or inertial parts is used. The new device Liquid Crystal Optical Phased Array (LCOPA). Supplying electric field to liquid crystal cell with electrodes, the extraordinary refractive index changes, which results in phase shift that modulates direction of incident beam. advantages this are small size, less energy consuming, programmable and addressable control. A one dimensional designed tested. resolution steering angle...

This paper presents a new bi-rhombic aperture arrays structure (BAAs) that exhibits high transmission and extraordinary field enhancement. Through numerical simulation theoretical analysis, the surface plasmon resonance mode quasi-FP within are approved to enhance optical transmittance effectively. The spectrum charge distribution of shows gap size short axis have significant effect on shiftting without damping peak wave, enabling achievement both optimized achieved 85% maximum enhancement...

In this article, an unconditionally stable (US) stochastic weighted Laguerre polynomials (WLPs)-based finite-difference time-domain (S-WLP-FDTD) method is presented to model electromagnetic (EM) wave propagation in random magnetized plasma media. The Monte Carlo correlation coefficients (MC-CC) scheme employed obtain between the electrical properties of materials and fields propagating them. This procedure significantly improves accuracy S-WLP-FDTD method. variabilities frequency collision...