查看更多>>摘要：In this paper, we introduce a different concept of optical spherical a-magnetic fibers with some optical conditions in spherical Heisenberg space. Besides, we give some relationships between optical spherical optimistic density and spherical optical energy for Lorentz forces. By using these optical spherical optimistic density, we give some methods to obtain optical spherical electroosmotic phi(a), phi(t), phi(s)-phase. Finally, we give some related optical electroosmotic microfluidics in spherical Heisenberg space.
查看更多>>摘要：In this paper, we study a fourth-order integrable nonlinear Schrodinger equation by bifurcation method of differential dynamical system. The study of the plane traveling wave system derives a binary Hamiltonian function. Based on Hamiltonian function, we obtain the bifurcation of the plane traveling wave system. Unfortunately, the Hamiltonian function is a hyper-elliptic function, it is impossible to find all bounded traveling wave solutions. We have to consider the traveling wave solution under some special parameter conditions. At the same time, we use the modified simplest equation method to find more traveling wave solutions for the fourth-order integrable nonlinear Schrodinger equation.
Zayed, Elsayed M. E.Gepreel, Khaled A.El-Horbaty, MahmoudYildirim, Yakup...
8页
查看更多>>摘要：This paper studies cubic-quartic optical solitons in birefringent fiber with the Kaup-Newell equation for the first time. Bright and singular solitons are recovered by the addendum to Kudryashov's method and unified Riccati equation expansion method. These solitons depend on certain parameter restrictions which are also listed in this paper.
Pal, Sushanta KumarGangwar, Kapil K.Senthilkumaran, P.
10页
查看更多>>摘要：Structured optical lattices obtained from interference of three linearly polarized plane waves arranged in a cone geometry produce interlaced polarization singularity structures. These lattices are known to be populated with both C-point and V-point singularities. A l l the lattice fields abide by the principle of index conservation. In this article, we focused on tailoring these polarization singularity lattices by perturbing the interfering beams with a relative encoded phase. We have shown that a spatial lateral-shifting of the ellipse-and vector field singularities by an order of lattice parameter can be achieved through an appropriate phase engineered design. Similar phase engineering in six and eight beam interference method of lattice generation produces different results. In six and eight beam interference, phase engineering enables realization of C-point only lattices and provides handedness control for the ellipse field singularities, whereas in three beam interference case, there is only a translation shi f t in the lattice structure.
Kudryashov, Nikolay A.Kutukov, Aleksandr A.Lavrova, Sophiya F.Safonova, Dariya, V...
8页
查看更多>>摘要：A critical review of recent articles by two scientific groups, which have considered a well-known nonlinear differential equation of the second order, is presented. One of these groups is led by G. Akram et. al. from Pakistan (Department of mathematics, University of the Punjab, Lahore). Another group is led by K.-J. Wang from China (School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo). In a number of papers published by these authors there have been presented a lot of solutions of the well-known differential equation. In fact, this differential equation was studied more than 150 years ago in the works of outstanding mathematicians Niels Henrik Abel (1827), Karl Gustav Jacob Jacobi (1829) and Karl Weierstrass (1855, 1862). However, the scientific groups of Akram and Wang, apparently not being familiar with the works of prominent mathematicians and not realizing that this equation has a unique solution on the complex plane, have been trying to rewrite the solution of this equation using symbolic mathematics programs misleading by that the scientific community. Although there are several erroneous works by Akram and Wang, only a few articles are analyzed here. The errors of a few works by these authors are discussed. The correct solutions of this popular equation, which is often encountered in nonlinear optics, are presented.
查看更多>>摘要：A Zeonex based dual-channel optical fiber Surface Plasmon Resonance (SPR) sensor has been proposed in this paper for gaseous analytes in terahertz regime. The subwavelength porous polymer fiber is surrounded by two semicircular air hole channels and the SPR effect can be excited by the ferroelectric polyvinylidene fluoride (PVDF) layer coated on the inner surface of the channels. A thin dielectric layer is used to enhance the coupling efficiency between the fundamental mode and the surface plasmon polariton mode. Using Finite Element Method, simulation results show that the sensitivity of the sensor can reach 110,000 nm/RIU, which is more than twice the sensitivity proposed by other existing THz optical fiber sensors. Moreover, the dual-channel design and the penetration of terahertz waves facilitate multi-channel detection, making it practical for biomedical and chemical fields.
查看更多>>摘要：Variable angle spectroscopic ellipsometry (VASE) was employed to examine the photoinduced effect on the optical properties of Ge25Sb5Se70 thin films, that were prepared by thermal evaporation method. The measurements were carried out at room temperature and in the UV-vis-NIR (near infrared) spectral region for photon wavelengths from 280 to 1000 nm. For data analysis, we employed linear combination consist from two Cody-Lorentz (CL) dispersion model in the entire measured photon range. The photo bleaching (increase in bandgap) was identified by this model. The behavior of the Cody-Lorentz model parameters with the time of light illumination is discussed in detail. To obtain a good fitting to the variation of fundamental CL amplitude with the time of exposer, we proposed a simple phenomenological model based on the alternation of bond formation and breaking. Good agreement between calculated and experimental data is obtained.
查看更多>>摘要：Despite the great success of deep learning approaches in image super-resolution tasks in recent years, a large proportion of the approaches emphasize designing complex network structures to continuously deepen the network to achieve superior reconstruction performance. However, some shortcomings need to be addressed, such as the large number of parameters required for training the complex network structure, which makes the model difficult to optimize and train. To address the above problems, we propose an accurate and lightweight neural network which is called the feature supplement network (FSN) to achieve image reconstruction. Specifically, we design a novel residual feature supplement structure(RFSS), which is composed of some residual feature supplement groups (RFSGs) and layer feature attention module (LFAM). Each RFSG contains several heterogeneous residual channel attention blocks (HRCAB) with different levels of skip connections. In RFSS, the stacked RFSG is able to extract features efficiently with limited parameters. Meanwhile, LFAM further improves the feature representation capability of the network because it is capable of capturing more discriminative features from the original image by considering the correlation between the extracted features of different depths. Experiments of various models conducted on benchmark datasets show that our proposed method not only can achieve comparable results compared to the state-of-the-art methods, but also effectively recover high-quality images, even when using limited parameters than the existing method for image super-resolution. The codes of our proposed structure-FSN are accessible on https: //github.com/ReckonerInheritor/RFSN.
查看更多>>摘要：Lithium niobate-on-insulator (LNOI) platform has been regarded as the new driving force to push the developments of integrated photonics, where efficient polarization management and mode conversion are the fundamental issues to be solved. In this work, we propose a triple waveguidebased TM-through/TE-converted polarization beam splitter (PBS) integrated on the z-cut LNOI platform, where the device works on the phase matching of optical mode. To improve the device performance and shorten the device size, we have added two cutting angles on both ends of the intermediate waveguide and optimized the length overlap between two evanescent coupling regions. From results, polarization extinction ratio 26.15 dB, insertion loss 0.47 dB for input TM0 mode, and mode conversion efficiency 99.6%, crosstalk - 22.82 dB, insertion loss 0.12 dB for input TE0 to output TE1 mode have been obtained, respectively. So, efficient polarization separation and mode conversion have been achieved simultaneously on-chip. Further, the proposed device scheme can be extended to output other higher-order TE modes via adding the width of the cross output waveguide. We hope such device scheme can make for the compact integration and capacity improvement of on-chip optical interconnects through multiplexing transmissions on the LNOI platform.
Piroozmandan, Mohammad MehdiFarokhi, FardadKangarloo, KavehJahanshahi, Mohsen...
16页
查看更多>>摘要：In this paper, a novel method is proposed to restore digital images corrupted by impulse noise. The proposed method in this paper consists of two phases for detecting impulse noise and image restoration. Corrupted pixels in the first phase of the proposed method are identified in two steps. In the first step, the corrupted pixels are identified by minimum values and the average Moore neighborhood pixels of the central pixel. In the second step of this phase, the pixels identified in the previous step as an uncorrupted pixel, are examined whether they are uncorrupted or corrupted once again for further accuracy by a new algorithm. The new algorithm uses cellular automata to identify corrupted pixels by measuring the harmonic and arithmetic means values of four different states of the position of five pixels in the neighborhood of the central pixel. In the second phase of the proposed method, the corrupted pixels are restored using the cosine similarity of the maximization of four different positions of the five pixels neighborhood to the central pixel using fuzzy cellular. The proposed algorithm is evaluated using image enhancement factor (IEF), Structural Similarity Index (SSIM), and Peak Signal to Noise Ratio (PSNR). The proposed method has been tested on 580 images at 15-90% noise density and the qualitative and quantitative results show that the proposed filter is robust enough at different noise levels and meaningful image details such as edges compared to other methods are well maintained.
NSTL
Elsevier