Optik最新文献

{"title":"Laser-induced nonlinear far-field diffraction patterns of disperse azo dyes","authors":"M.Y. Shubar,&nbsp;H.L. Saadon,&nbsp;M.A. Rahma","doi":"10.1016/j.ijleo.2025.172422","DOIUrl":"10.1016/j.ijleo.2025.172422","url":null,"abstract":"<div><div>The nonlinear optical properties of the dispersed azo dyes (orange 3, orange 13 and orange 25) were investigated using laser field-induced spatial self-phase modulation (SSPM) with continuous wave laser of 532 nm. The research of disperse azo dyes at different concentrations and incoming laser power produced diffraction ring patterns. The results of the experiment showed a large nonlinear refractive index n₂ and a large thermo-optical coefficient dn/dT. The effect of excitation laser input and time evolution on shape diffraction pattern shape was investigated. We therefore explain the collapse effect of the diffraction circle model. The results show that the type of laser input is responsible for the variation of the number of diffraction circles. The results indicated that the dispersed azo dyes are a good candidate for use as an optical limiter.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"335 ","pages":"Article 172422"},"PeriodicalIF":3.1,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of photonic devices using Genetic Algorithm integrated with Shannon entropy","authors":"Marcos Sergio Gonçalves,&nbsp;Alex Lattaro de Oliveira","doi":"10.1016/j.ijleo.2025.172411","DOIUrl":"10.1016/j.ijleo.2025.172411","url":null,"abstract":"<div><div>Genetic Algorithm has become a powerful metaheuristic method for developing photonic devices. Metaheuristic optimization allows challenging designs when associated with numerical methods of electromagnetic analysis. However, populations can become large, which increases total optimization time. Based on Shannon entropy, this article presents a novel methodology that acts on the distribution of initial solutions in the search space. Hence, the proposed method can benefit the optimization processes of photonic devices, consequently accelerating the convergence. The study shows three applications of this technique, both of which exhibited improved convergence optimization.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"334 ","pages":"Article 172411"},"PeriodicalIF":3.1,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stability analysis and extraction of newly cubic–quintic soliton wave structure for the generalized derivative resonant nonlinear Schrödinger equation through an analytical technique","authors":"Mohamed A. Elhady ,&nbsp;Hamdy M. Ahmed ,&nbsp;Ahmed M. Ahmed ,&nbsp;Haytham M. Rezk ,&nbsp;Wafaa B. Rabie","doi":"10.1016/j.ijleo.2025.172412","DOIUrl":"10.1016/j.ijleo.2025.172412","url":null,"abstract":"<div><div>This study investigates the analytical solutions of the generalized derivative resonant nonlinear Schrödinger equation, a fundamental model governing wave propagation in nonlinear dispersive media with applications in nonlinear optics, quantum mechanics, and plasma physics. We employ a modified extended direct algebraic method to systematically derive exact solutions, extending traditional approaches to incorporate cubic–quintic nonlinearity, which accounts for the interplay between self-focusing and defocusing effects.</div><div>By transforming the generalized derivative resonant nonlinear Schrödinger equation into an integrable algebraic form, we obtain a diverse set of analytical solutions, including bright and dark solitons, singular solitons, periodic waves, rational solutions, exponential solutions, Jacobi and Weierstrass elliptic functions. These solutions provide deep insights into the formation and dynamics of localized wave structures in nonlinear systems. We then conduct a rigorous stability analysis of the obtained solitons through linear perturbation theory, identifying critical parameter regimes where stable propagation occurs. The stability thresholds are shown to depend fundamentally on the balance between cubic self-focusing and quintic defocusing effects. To validate our results, we present numerical simulations and graphical representations of selected solutions, illustrating their stability and propagation characteristics. Our findings contribute to the theoretical understanding of nonlinear wave phenomena and offer potential applications in optical communications, quantum information, and ultrafast laser physics. This work not only advances the analytical treatment of the generalized derivative resonant nonlinear Schrödinger equation but also provides a robust framework for exploring other high-order nonlinear evolution equations in mathematical physics.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"335 ","pages":"Article 172412"},"PeriodicalIF":3.1,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TiO2-FG-based plasmonic sensor with enhanced figure of merit for sensing applications: A numerical approach","authors":"Rahul Runthala ,&nbsp;N. Grover ,&nbsp;Pankaj Arora","doi":"10.1016/j.ijleo.2025.172421","DOIUrl":"10.1016/j.ijleo.2025.172421","url":null,"abstract":"<div><div>A refractive index-based surface plasmon resonance sensor using a multilayer heterostructure in the Kretschmann configuration is proposed for the near-infrared region. In the proposed configuration, aluminum is used as a plasmonic metal, titanium dioxide is used as a dielectric layer, and a fluorinated graphene (FG) layer is used as a 2D nanomaterial to enhance the performance parameters. A thorough comparative study is conducted between popularly used titanium compounds: Titanium dioxide (TiO₂) and Titanium disilicide (TiSi₂). For the proposed SPR sensor, each layer is engineered and optimized on the grounds of linewidth, detection accuracy (DA), and Figure of Merit (FOM), which are the critical performance parameters. To this end, the geometrical parameters are calculated using the transfer matrix method and analyzed meticulously to find the optimum trade-off points. The proposed sensor is numerically tested efficiently to sense different concentrations of hemoglobin in human blood. For the angle interrogation technique at the wavelength of 1550 nm, the sensor provides an enhanced FOM of 462.8 RIU⁻¹ and a DA of 4 degrees⁻¹. Thus, the proposed design opens a broader window for bio-sensing applications because of the advantages TiO₂ and FG layers offer in enhancing the sensing parameters.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"335 ","pages":"Article 172421"},"PeriodicalIF":3.1,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144146851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pattern recognition-based strategy applied to continuous intensity evolution for quantifying the stress field in digital photoelasticity","authors":"Juan Briñez-de León ,&nbsp;Lina Montoya-Suárez ,&nbsp;Hermes Fandiño-Toro","doi":"10.1016/j.ijleo.2025.172390","DOIUrl":"10.1016/j.ijleo.2025.172390","url":null,"abstract":"<div><div>In engineering, accurate evaluation of stress fields is paramount to ensure structural integrity and prevent failure in various applications. Despite advances in techniques such as analytical models and computational simulations, challenges remain due to differences in experimental parameters that limit their real-world applicability. Digital photoelasticity offers promise in stress analysis, particularly through isochromatic fringes, but faces hurdles in quantifying stress information from dynamic color changes. To address this gap, this paper proposes a novel approach based on pattern recognition within a single polariscope configuration. By analyzing color trajectories of pixel positions individually, the approach aims to overcome spatial dependencies and improve the accuracy of stress field evaluation. Potential results include a better understanding of dynamic stress behavior and more accurate identification of stress patterns, contributing to improved engineering designs and structural reliability. This approach uses synthetic and experimental photoelasticity videos of disk and ring under diametric compression.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"334 ","pages":"Article 172390"},"PeriodicalIF":3.1,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144139144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and simulation of band stop plasmonic filter with high quality factor and enhanced optical performance","authors":"Amirhossein Shams,&nbsp;Hassan Kaatuzian,&nbsp;Sara Gholinezhad Shafagh","doi":"10.1016/j.ijleo.2025.172401","DOIUrl":"10.1016/j.ijleo.2025.172401","url":null,"abstract":"<div><div>In this paper, we present the design and performance of a band-stop plasmonic filter incorporating a triangular resonator and a central circular cavity within a Metal-Insulator-Metal (MIM) waveguide configuration. The filter operates based on Surface Plasmon Polaritons (SPPs), which are excited at the metal-dielectric interface, allowing for a compact design with excellent optical performance. The filter design was optimized through a combination of numerical simulations using the Finite Difference Time Domain (FDTD) method and theoretical analysis. The simulation results indicate that the filter achieves a high-quality factor of 272 at a resonance wavelength of 818 nm and a cavity width (d) of 35 nm, significantly outperforming previously designed filters. Additionally, the paper presents a detailed comparison of the plasmonic performance of silver and gold, examining their effects on the quality factor, transmission spectrum, resonance wavelength, and overall optical performance. The results highlight that the choice of material plays a crucial role in optimizing the filter’s characteristics, as silver demonstrates a higher-quality factor and sharper resonance compared to gold. The filter's high-quality factor provides excellent wavelength selectivity and suppresses unwanted interference effectively, ensuring efficient performance. Moreover, the proposed structure exhibits a small full width at half maximum (FWHM) and tunable resonance wavelengths through precise control of geometric parameters such as cavity dimensions and resonator shape. These tunable characteristics make the filter highly suitable for advanced photonic applications, including optical filtering, high-speed communication systems, and biosensing. The significant results of this study confirm that the proposed plasmonic filter structure is a promising candidate for future nanophotonic systems, where high efficiency and precise wavelength control are essential.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"334 ","pages":"Article 172401"},"PeriodicalIF":3.1,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic control of high-order diffraction grating in complex Δ∇ atomic configuration","authors":"Himani Thakur,&nbsp;Zubair Iqbal Dar,&nbsp;Paramjit Kaur","doi":"10.1016/j.ijleo.2025.172370","DOIUrl":"10.1016/j.ijleo.2025.172370","url":null,"abstract":"<div><div>We introduce a new model employing a four-level <span><math><mrow><mi>Δ</mi><mo>∇</mo></mrow></math></span> type atomic system to diffract weak probe light into higher-order directions via the phenomenon of electromagnetically induced grating. The position-dependent atom-field interaction produces a periodic transmission spectrum, resulting in various Fraunhofer diffraction patterns generated by the all-optical grating. The key advantage of this scheme lies in the existence of M (microwave) and R (radio-frequency) fields, which enable quantum interference among different transition pathways. Our ongoing research holds substantial significance as the proposed atomic-scheme offers precise control over higher-order diffraction intensities. We present a comprehensive study of the diffraction properties of amplitude, phase, and hybrid gratings, focusing on their efficiency and tunability. Hybrid gratings, resulting from the interplay of amplitude and phase effects, achieve a peak first-order efficiency of 32.8% and exhibit sensitivity to <span><math><msub><mrow><mi>δ</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span>, <span><math><mi>Ω</mi></math></span>, and L. These results provide new insights into the design and optimization of gratings for high-efficiency optical applications. Additionally, it is noteworthy that our proposed system, at resonance, has the remarkable capacity to generate a phase grating.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"334 ","pages":"Article 172370"},"PeriodicalIF":3.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Squeezing and photon number properties of two-mode squeezed lights with a V-type three-level atom","authors":"Gomera Biyazn,&nbsp;Misrak Getahun","doi":"10.1016/j.ijleo.2025.172371","DOIUrl":"10.1016/j.ijleo.2025.172371","url":null,"abstract":"<div><div>The squeezing and mean photon number properties of the cavity mode light produced by a <span><math><mo>∨</mo></math></span>-type three-level atom with subharmonic generation in an optical cavity coupled to a squeezed vacuum reservoir have been studied. Employing the expectation values of the cavity mode variables at steady state, the mean photon number and quadrature variances have been determined. The global and local mean photon number and quadrature squeezing increase with the subharmonic light and squeezing parameter but decrease as the atom–field coupling constant and cavity decay constant increase. The power spectrum is maximum at the central frequency. The results also show that the atomic decay due to the reservoir affects the local but does not affect the global mean photon number and quadrature squeezing.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"333 ","pages":"Article 172371"},"PeriodicalIF":3.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization of plasmonic Al/TiO₂ thin film characteristics via scanning pulsed fiber laser deposition","authors":"Noor M. Abdulmalek ,&nbsp;Hussein A. Jawad","doi":"10.1016/j.ijleo.2025.172387","DOIUrl":"10.1016/j.ijleo.2025.172387","url":null,"abstract":"<div><div>The deposition method of perovskite solar cell layers significantly impacts device functionality and the achievement of industrial goals. Aluminum (Al) nanoparticles with rutile titanium oxide (TiO₂) nanoparticle thin films are fabricated on Fluorine Tin Oxide (FTO) glass substrates by nanosecond pulsed fiber laser deposition (PLD) to be used as a plasmonic electron transport layer (ETL) in perovskite solar cell (PSC). The effect of various pulsed fiber laser parameters on the structural, optical, and surface morphology on Al/TiO₂ films is extensively examined utilizing a variety of measurement techniques; X-ray diffraction (XRD), Ultraviolet–visible (UV–Vis) spectroscopy, Field emission scanning electron microscopy (FE-SEM) and Atomic Force microscope (AFM). XRD demonstrates that Al/TiO₂ thin films has a mixed phase (anatase/rutile). The minimum average crystallite size of Al/TiO₂ thin films deposited at (2 W - 40 kHz) is (19.8 nm). The absorption spectrum of the deposited Al/TiO₂ thin film at (10 W - 20 kHz) shows a red-shifted absorption peak at 316 nm, while 307 nm is detected at (2 W - 20 kHz). As the pulse repetition rate rise (40, 60 kHz), a new absorption peak in the UV spectral region at 341 nm was observed. FESEM images demonstrate the nanoparticles’ uniformity and polycrystalline nature. The shape of nanoparticles becomes more uniform and smaller size when the power increases. The minimum power required to get a uniform film is 0.8 W nm with suitable thickness of 398.8 obtained by fitting the thickness values curve of Al/TiO₂ thin films. The elemental analysis examined by the EDX spectrum of Al/TiO₂ thin films consists of oxygen, aluminum, and titanium. AFM images reveal a granular microstructure, and a flat texture, with the lowest surface roughness. The obtained results from the current study indicate that the structural, optical, and morphological properties can be controlled by varying the fiber laser parameters to deposit an efficient plasmonic Al/TiO₂ thin films could be used as an electron transport layer which open new trends to improve the performance of perovskite solar cell.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"334 ","pages":"Article 172387"},"PeriodicalIF":3.1,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser Wavelength dependence of nonlinear optical properties of CdTe, CdS, and core-shell CdTe/CdS QD nanoparticles","authors":"Amir H. Shokouh,&nbsp;Mohammad Khnazadeh,&nbsp;Farzad Farahmandzadeh,&nbsp;Mehdi Molaei","doi":"10.1016/j.ijleo.2025.172398","DOIUrl":"10.1016/j.ijleo.2025.172398","url":null,"abstract":"<div><div>In this paper, CdTe, CdS, and CdTe/CdS core-shell nanoparticles were synthesized using photochemical methods, and their structural and optical properties were examined using techniques such as X-ray diffraction spectroscopy (XRD), Scanning Electron Microscopy (SEM), UV-Vis absorption and Photoluminescence (PL) spectroscopy. The results showed that the synthesized nanoparticles CdTe, CdS, and CdTe/CdS with optical bandgaps of 2.32, 2.37, and 2.15 eV, and 3, 2.8, and 8 nm average sizes. respectively have uniform sizes and distributions, beyond that their optical properties are highly dependent on their size and chemical composition. Afterward, using the Z-scan technique, nanoparticles nonlinear absorption (NLA) and nonlinear refraction (NLR) coefficients were evaluated under CW laser Diode (532 nm), He-Ne (632.8 nm), and Nd:YAG pulsed laser with wavelength and pulse width (1064 nm, 3 ns) and its second harmonic (SHG) (532 nm). According to the experimental results, CdTe, CdS, and CdTe/CdS nanoparticles have shown unique NLA and NLR behaviors and strike optical limiting due to strong dependency on laser wavelengths. For 532 nm diode laser (CdTe, CdS, and CdTe/CdS) QDs, the NLA and NLR coefficients and orders were calculated as (53<em>.</em>48<em>,</em> 27<em>.</em>94<em>,</em> 30<em>.</em>13) cm<em>/</em>MW and (6<em>.</em>496<em>, -</em>14<em>.</em>206<em>,</em> 9<em>.</em>21) cm²<em>/</em>GW, respectively. The results indicate that (NLA) <em>β</em> with single photon absorption (SPA) mechanism for CW diode laser (532 nm), two-photon absorption (TPA) for 632.8 nm, and reverse saturable absorption (RSA) for 1064 nm IR/SHG lasers, and in the case of (NLR), the self-focusing and defocusing mechanisms have been observed and determined for each nanoparticle. These findings can serve as a basis for designing and developing advanced Photonic and optical and devices that utilize these nanoparticles.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"333 ","pages":"Article 172398"},"PeriodicalIF":3.1,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}