首页期刊导航|Optik
期刊信息/Journal information
Optik
Wissenschaftliche Verlagsgesellschaft
Optik

Wissenschaftliche Verlagsgesellschaft

0030-4026

Optik/Journal OptikSCIISTPEIAHCI
正式出版
收录年代

    Beam controlled lighting design: An approach towards optimization of road lighting design

    Chakraborty, SuddhasatwaGoswami, Aiswarya DevMazumdar, Saswati
    11页
    查看更多>>摘要：LED based street lighting has been introduced everywhere for energy saving aspect. The Optical Control of LED is very much possible with change of beam angles. This beam-angle based switching of LED based street lighting installations is a new area to be explored. Global research says LED is an energy saving light source. But during low or off traffic hours, portion of LED arrays of a luminaires may be switched on/off on the basis of beam-angle. The light level is reduced. The 'beam-angle switching'definitely ensures energy saving, but the investigation of the human performance under this condition is also necessary. There is no such evidence available in favour of the effectiveness of 'beam-angle switching' on human performance. In this paper an experimentation based studies have been conducted to identify the driver's response during the object detection under different lighting conditions as PRO, COUNTER and FULL GLOW of a LED luminaire. The visibility study has been carried out in a simulated road to prove the effectiveness of this beam-angle based switching from the human performance as well as energy saving point of view.
      原文链接:
    • NSTL
    • Elsevier

    Cubic-quartic optical solitons in birefringent fibers with Sasa-Satsuma equation

    Zayed, Elsayed M. E.Alngar, Mohamed E. M.Shohib, Reham M. A.Biswas, Anjan...
    8页
    查看更多>>摘要：Objective: The paper recovers cubic-quartic optical solitons with the Sasa-Satsuma equation that includes a combination of third-order dispersion and fourth-order dispersion effects to address cubic-quartic vector solitons for the first time.& nbsp;Methods: Two integration schemes are applied to catch out the solitons to the newly structured model. They are G '/G-expansion scheme and modified Kudryashov's approach. These pave way for a full spectrum of vector solitons. The recovered vector solitons are enumerated after a revisiting the mathematical strategies.& nbsp;Results: The mathematical approaches retrieve the dark, bright and singular vector solitons to the model. These solitons are presented by virtue of the certain restrictions. Rational and singular periodic solutions are also emerged with the mathematical schemes.& nbsp;Conclusion: Cubic-quartic vector solitons are yielded for such a model in this work for the first time. This would naturally lead to further ventures in this area. The newly structured model would be to address to recover the conservation laws. Other natural extensions to the model would be to consider with DWDM topology that would also lead to soliton solutions and their respective conservation laws.
      原文链接:
    • NSTL
    • Elsevier

    Tunable plasmonic band stop filter based in graphene nanoribbon

    Melo, GeraldoCastro, WagnerOliveira, Cristiano
    11页
    查看更多>>摘要：In this work we suggest and analyze a simple and compact structure that can work as a graphene-based plasmonic band stop filter for the THz region. The device is formed by graphene nanoribbons, where the propagation and blocking of surface polariton plasmon waves occurs, which fully return to the device's input port. The graphene nanoribbons are deposited on a two layer dielectric substrate formed by SiO2 (silica) and Si (silicon). The band stop filter can be dynamically controlled by applying an electrostatic field that changes the chemical potential of graphene, changing the filter's operating range. Numerical simulations show that the insertion losses reach levels around-55 dB with a bandwidth of 7.3 THz, showing that the device has good performance for the frequency range used in our work and can be used for future applications.
      原文链接:
    • NSTL
    • Elsevier

    Physical, structural, mechanical and radiation shielding features of waste pharmaceutical glasses doped with Bi2O3

    Kurtulus, R.Buriahi, M. S.Issa, Shams A. M.Tekin, H. O....
    14页
    查看更多>>摘要：In the present work, by utilizing waste pharmaceutical glass (PG) within the attempt of gaining a value-added product for radiation shielding applications, a new glass system was fabricated with the nominal composition of x Bi2O3 - (100-x)PG (x: 0, 5, 15, 25, and 35 wt%). Conventional melt quenching technique ensured to synthesize five different glass samples, namely Bi0, Bi5, Bi15, Bi25, and Bi35. For understanding the role of Bi2O3 in the PG system, we implemented several characterization analyses, including physical, structural, mechanical, and radiation shielding properties. According to the findings, the density of the glasses varied between 2.5344 and 3.4492 +/- 0.001 g.cm(-3) for Bi0 to Bi35. On the other hand, the X-ray diffraction (XRD) technique confirmed the non-crystalline structure without any sharp peak existence. The mechanical parameter of the glases decreased with the increasing in Bi2O3 content in the glass composition. Radiation shielding competencies were determined experimentally with gamma transmission measurements with the energy range of 53-3.83 keV. The results were checked with generated outcomes with EpiXS program and MCNPX codes. The Bi35 sample with doped 35 wt% of Bi2O3 owns the lowest of HVL, MFP, EABF, and EBF values and highest MACs and Zeffs, which are desired for a shielding material, among the produced glasses. It is concluded from the outcomes obtained that the addition of Bi2O3 significantly increased the photon shielding ability of PG glasses.
      原文链接:
    • NSTL
    • Elsevier

    Fast classification and recognition method of blood cells using deep learning based on wrapped phase in polar coordinate

    Xu, YuanyuanXue, ShuangshuangZou, YangLiao, Jingrong...
    14页
    查看更多>>摘要：In order to realize the nondestructive, fast and accurate classification of batch of blood cells, a classification method using deep learning based on wrapped phases in polar coordinate is proposed. In this method, after the coordinate transformation, the wrapped phases of cells are obtained first, and then three characteristic parameters of symmetry, roundness and singularity are established to analyze the phases. Subsequently, the data set of wrapped phases is built with the data augmentation. Finally, the classification and identification of batch of blood cells are realized through the convolutional neural network training based on LeNet-5 and the stochastic gradient descent algorithm (SGDM). An excellent result of the classification accuracy rate of 100% is obtained, which proves that the method has good feasibility and high accuracy. This method only requires the wrapped phases of cells in polar coordinates, so the complex unwrapping procedure and the additional noise effects are avoided.
      原文链接:
    • NSTL
    • Elsevier

    Method for finding optical solitons of generalized nonlinear Schrodinger equations

    Kudryashov, Nikolay A.
    13页
    查看更多>>摘要：Objective: New generalized Schrodinger equations with polynomial nonlinearities are consid-ered. The Cauchy problem for these equations cannot be solved by the inverse scattering transform and optical solitons of these equations are looked for taking into account the traveling wave solutions.Method: Application of the well-known auxiliary equations as the Riccati equation and equa-tions for elliptic functions for construction of solutions of new generalized Schrodinger equations is impossible right away. Therefore solutions of nonlinear ordinary differential equations are found using the transformations of dependent and independent variables. This extended approach allows us to obtain some new auxiliary nonlinear ordinary equations.Result: New auxiliary differential equations allow to look for optical solitons of the other generalized Schrodinger equations. We demonstrate that by using new auxiliary equations, we can find the optical solitons of the generalized nonlinear Schrodinger equations of the fourth degree with a polynomial of the eighteenth power.
      原文链接:
    • NSTL
    • Elsevier

    Terahertz metasurfaces based on bound states in the continuum (BIC) for high-sensitivity refractive index sensing

    Lu, YongchengWen, QiyeLiu, XinyanLi, Fuyu...
    9页
    查看更多>>摘要：Terahertz metasurface has attracted much attention in the field of label-free refractive index sensing due to its special fingerprint spectrum. Combining the special electromagnetic response of the metasurface and the ultra-high Q property of the quasi-BIC, a novel high-sensitivity THz sensor is proposed based on symmetry-protected BIC. The breaking of the mirror symmetry means that the resulting dipole displacement excites the surface resonance, and the BIC state is verified by satisfying the quality factor of the inverse square law. It is verified that the oblique incident wave vector can excite the BIC to the quasi-BIC. And the two different asymmetric parameters (displacement S and incident angle theta) of generating quasi-BIC can influence or even counteract each other. In order to increase the accuracy of the detection results, two different sensing parameters are used to detect the same analyte at the same time. The sensitivity of frequency shift difference and amplitude difference is as high as 11.17 GHz/RIU and 0.1766 /RIU, respectively. This work not only provides new ideas for the design of high-sensitivity sensors, but also has potential applications in the field of low-concentration sensing.
      原文链接:
    • NSTL
    • Elsevier

    A synergistic effect of heavy metal oxides to enhance the physical, optical, and radiation-absorption properties of TeO2-Li2O-BaO glasses

    Alzahrani, Jamila S.Muniz, Robson FerrariAlrowaili, Z. A.Novatski, Andressa...
    16页
    查看更多>>摘要：A series of 75TeO2-(20-x)Li2O-xBaO glasses was successfully synthesized using the meltquenching method. The glass samples were labeled as TLB05, TLB10, TLB15, TLB20 and TLB25 for x = 5, 10, 15, 20 and 25 mol% respectively. The prepared glasses were studied for their structural, optical, and radiation shielding properties. The optical band gap of the glasses decreased linearly from 3.45 to 3.28 eV with BaO in the range 5-25 mol%. The analysis of the thermal properties shows an increase in Tg values with the replacement of Li2O by BaO. The gamma ray shielding coefficients for the glasses estimated by FLUKA simulation and validated by XCOM varied from 0.0329 to 1.4383 cm2g- 1, 0.0332 - 1.4879 cm2g- 1, 0.0334 - 1.5327 cm2g- 1, 0.0335 - 1.5671 cm2g- 1, and 0.0336 - 1.5964 cm2g- 1 for BaO concentration of 5%, 10%, 15%, 20%, and 25% respectively. Generally, the introduction of BaO improved the photon and charged particles (electron, proton, alpha particle, carbon ions) absorbing parameters of the glasses. The fast neutron removal cross section of the TLB glasses grew from 0.0995 to 0.1014 cm- 1 as the molar concentration of BaO declines from 25 to 5 mol%. The increase in the BaO content also quenched the thermal neutron absorption cross section. For TLB5 - TLB25, the coherent, incoherent, absorption, and total thermal neutron cross sections varied between 1.0582 and 1.2059 cm- 1, 0.1251 - 0.0024 cm-1, 9.5411 - 0.0876 cm- 1, and 10.7244 - 1.2958 cm- 1 accordingly. In general, TLB25 displayed the most effective photon shielding ability but the weakest neutron absorber. The TLB glasses in addition showed superior radiation shielding ability compared to some conventional shields.
      原文链接:
    • NSTL
    • Elsevier

    Evolution of a fractional-charge optical vortex upon free-space propagation

    Kotlyar, V. V.Nalimov, A. G.
    10页
    查看更多>>摘要：Previously, it has been demonstrated theoretically (J. Opt. 6, 259 (2004)) and experimentally (Opt Express 19, 5760 (2011)) that upon the free-space propagation, an initial fractional-charge optical vortex acquires an integer topological charge (TC) equal to the nearest smaller integer if the fractional part is less than 0.5, otherwise becoming equal to the nearest larger integer. In this work, we demonstrate by the numerical modeling that as an initial fractional-charge optical vortex propagates in free space, the TC changes to the nearest smaller or larger integer at a fractional part threshold of 0.12. The fact is that an additional singularity center is born on the beam periphery where the field intensity is near-zero (one millionth part of the maximum), meaning that it cannot be experimentally detected but can be numerically simulated.
      原文链接:
    • NSTL
    • Elsevier

    Some novel mathematical analysis on a corneal shape model by using Caputo fractional derivative

    Erturk, Vedat SuatAhmadkhanlu, AsgharKumar, PushpendraGovindaraj, V....
    10页
    查看更多>>摘要：In this article, we solve a fractional boundary value problem (FBVP) for modeling the human corneal shape dynamics. We use the Caputo fractional derivative having singular type kernel. We propose some novel simulations to prove the existence of a unique solution of the given FBVP. The numerical solution of the proposed problem is derived by using a polynomial least squares method. We do a number of graphical observations at various values of the given model parameters along with the orders of considered fractional derivative. The main motivation of this research article is to specify the possibilities that the corneal shape may slightly differ to the shapes which were investigated in various past studies at any fixed set of available parameters. The given model was not generalized before by using any fractional derivative which is the main reason for the proposal of this study as well as the novelty of the work.
      原文链接:
    • NSTL
    • Elsevier