Optical and Quantum Electronics最新文献

{"title":"Theoretical investigation of the generation of picoseconds pulses with DFB lasers by gain-switching","authors":"Vasile Tronciu,&nbsp;Veronica Dobrovolschi,&nbsp;Hans Wenzel","doi":"10.1007/s11082-026-09170-y","DOIUrl":"10.1007/s11082-026-09170-y","url":null,"abstract":"<div><p>We report the results of theoretical investigations on the generation of picoseconds pulses with gain–switched distributed feedback (DFB) lasers. Using a numerical simulation tool solving the traveling-wave equations, we investigate the influence of material and geometrical parameters on the pulse characteristics. Depending on the parameters, pulses with a peak power above 1 W and a pulse width of less than 10 ps are obtained. The dependence of pulse width, peak power, and pulse energy on the parameters is discussed based on approximate expressions.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"58 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of an ultrafast all-optical half-adder using the modes of a nonlinear three-mode fiber","authors":"Saba Parva,&nbsp;Mohsen Hatami","doi":"10.1007/s11082-026-09163-x","DOIUrl":"10.1007/s11082-026-09163-x","url":null,"abstract":"<div><p>In this study, a simulation-driven design of all-optical logic gates, including AND, OR, NAND, XOR and XNOR, as well as an all-optical half-adder, is presented using a multimode nonlinear optical fiber. Three spatial modes with two orthogonal polarization states each (resulting in six polarization modes in total) are employed as input and output ports. Fundamental bright solitons are utilized as input pulses, with the logical value “1” represented by the presence of a pulse and “0” by its absence. Due to nonlinear intermodal interactions along the fiber, energy is exchanged among the modes, and the resulting output pulse-energy distribution is used to determine the logical response. Approximately 144,000 possible logical configurations for AND, OR, NAND, XOR and XNOR operations are evaluated, resulting in the identification of 583 valid logic cases. Furthermore, five configurations are identified that satisfy the required truth-table conditions for implementing an all-optical half-adder. A pulse width of 1ps was considered, and as a result, an estimated operational speed of approximately 1 tera-operation per second is achieved by the proposed half-adder.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"58 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-speed prediction of slow light behavior of ring-hole photonic crystal waveguides using artificial neural networks","authors":"Paurnima Vadak,&nbsp;Preeti Bhamre","doi":"10.1007/s11082-026-09157-9","DOIUrl":"10.1007/s11082-026-09157-9","url":null,"abstract":"<div><p>The design and analysis of dispersion characteristics in photonic crystal waveguides traditionally rely on physics based numerical solvers, which become computationally expensive as well as time consuming for large parameter spaces. In this work, we present an artificial neural network (ANN) based forward prediction for fast and efficient modeling of slow-light behavior in ring hole photonic crystal waveguides (RPCWs). A dataset is generated using finite element simulations by systematically varying the inner ring radius, vertical and horizontal position of the ring holes in the first row adjacent to the waveguide while keeping the outer radius, material, and lattice constant fixed. A multi-layer perceptron ANN is trained to predict the dispersion curves of the guided mode and estimate the group indices of the structures closely matching FEM results while reducing computation time by several orders of magnitude. The model demonstrates robust generalization across unseen structures, indicating its suitability for rapid parametric exploration and design optimization. This data-driven framework significantly accelerates the analysis of complex slow-light photonic crystal devices and supports efficient engineering of next-generation integrated photonic components.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"58 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of a triple-tunable multi-functional terahertz metamaterial absorber","authors":"Baojing Hu,&nbsp;Changjin Cai,&nbsp;Ke Li,&nbsp;Weifeng Lu","doi":"10.1007/s11082-026-09176-6","DOIUrl":"10.1007/s11082-026-09176-6","url":null,"abstract":"<div><p>This article proposed a dual-band terahertz absorber based on graphene and indium antimonide (InSb), which can be electrically, thermally, and magnetically tuned. The results indicate that, in the absence of an external magnetic field, the absorber exhibits two distinct absorption peaks based on the bright–bright mode coupling of cross elliptical and circular InSb arrays, with an average absorption rate of 97.2%. Meanwhile, its physical absorption mechanism can be theoretically analyzed by the equivalent circuit model (ECM) and the electric field intensity distribution at two absorption peaks. Secondly, when the external magnetic field is applied along the X direction, the absorption frequency and absorption rate of the absorber can be electrically tuned by changing the graphene chemical potential, and thermally and magnetically tuned by changing the temperature of InSb and the magnitude of the external magnetic field. Afterwards, the effects of the long and short axes of InSb ellipse, the radius of the InSb circle, and the thickness of dielectric layer on the absorption effect are discussed. Finally, further research is conducted on the application prospects of the absorber as refractive index sensor, temperature sensor, and magnetic field sensor. This work provides a theoretical basis for the design of multi-tuned absorbers and sensors.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"58 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical field enhanced tunable plasmonic absorber based on high-index contrast grating employing ENZ state of ITO","authors":"Suresh Kumar Pandey,&nbsp;Rahul Dev Mishra,&nbsp;Ashutosh Kumar,&nbsp;Santosh Kumar,&nbsp;Prem Babu,&nbsp;Nikita Mohanta,&nbsp;Mukesh Kumar","doi":"10.1007/s11082-026-09128-0","DOIUrl":"10.1007/s11082-026-09128-0","url":null,"abstract":"<div><p>An optical field-enhanced tunable plasmonic absorber based on a high-index contrast grating (HCG) utilizes the epsilon-near-zero (ENZ) properties of indium tin oxide (ITO) is experimentally demonstrated<i>. </i>The HCG enhances light–matter interaction, while the engineered ENZ state of ITO increases optical absorption. The plasma frequency is tailored to 1550 nm to enable efficient electro‑optic tuning. The device demonstrates precise control of light absorption and modulation, achieving an extinction ratio of 1.9 dB/µm, It also supports a 3 dB bandwidth of 72 GHz, making it suitable for high-speed optical communication systems. Additionally, energy consumption is remarkably low, at 56.25 p-Joules/bit, underscoring its efficiency. These results indicate that the proposed absorber is a promising candidate for low‑power and high‑speed integrated photonic systems<i>.</i></p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"58 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149133274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Terahertz parametric amplification based on four-wave mixing process in a silicon rib waveguide","authors":"Mehdi Azargoon,&nbsp;Faezeh Pakfetrat,&nbsp;Hassan Pakarzadeh","doi":"10.1007/s11082-026-09175-7","DOIUrl":"10.1007/s11082-026-09175-7","url":null,"abstract":"<div><p>Terahertz (THz) radiation is very important due to its special properties and various applications in science and technology. Recently, it has been a great research interest to generate and amplify THz radiation using four-wave mixing (FWM) process. This paper presents high-efficiency parametric amplification of THz waves using a photonic crystal-based silicon rib waveguide, which serves as an effective gain medium for tightly confined THz waves. The waveguide which is designed using the finite-difference time-domain (FDTD) method, exhibits a small effective mode area and low propagation loss in the THz region. The simulated gain spectrum for a pump wavelength of 26 μm shows efficient FWM in the 30–35 μm wavelength range, achieving a peak parametric gain of 29.5 dB at 31.8 μm.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"58 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive DFT investigation of K2AgIrX6 (X = Cl, Br, I) double perovskites: from structural stability to predictive telecommunication applications","authors":"Bouhafs Khalfallah,&nbsp;Djamel Eddine Si Mohammed ,&nbsp;Mohammed Batouche,&nbsp;Mohamed El Amine El Goutni,&nbsp;Omar Merabiha,&nbsp;Taieb Seddik,&nbsp;Fatima Zohra Driss-Khodja","doi":"10.1007/s11082-026-09164-w","DOIUrl":"10.1007/s11082-026-09164-w","url":null,"abstract":"<div><p>This study presents a systematic investigation of the structural, mechanical, electronic, and optical properties of the cubic K₂AgIrX₆ (X = Cl, Br, I) system using Density Functional Theory (DFT) within the Full-Potential Linearized Augmented Plane Wave (FP-LAPW) framework, incorporating Spin-Orbit Coupling (SOC) and the Tran-Blaha modified Becke-Johnson (TB-mBJ) potential. Thermodynamically, all three compounds exhibit negative formation energies, confirming their chemical feasibility. Mechanical and elastic calculations prove that all members satisfy the Born stability criteria. Phonon dispersion calculations reveal complete dynamical stability at 0 K for K₂AgIrCl₆ and K₂AgIrBr₆, while K₂AgIrI₆ exhibits soft phonon modes around high-symmetry points, indicating a local 0 K dynamical instability typical of heavy halide perovskites that can be stabilized at operational temperatures by finite-temperature lattice vibrations or subtle symmetry transitions. Electronic structure analysis demonstrates a direct bandgap (X-X) across the series, with bandgap tuning ranging from 1.711 eV (Cl) to 0.455 eV (I). The low electron effective masses (down to 0.083 m₀ for K₂AgIrI₆) indicate high carrier mobility, favoring optoelectronic applications. Furthermore, a preliminary phenomenological assessment within a Mach-Zehnder modulator framework indicates a strong refractive index dispersion and high phase-shift sensitivity for K₂AgIrI₆ (n(0) = 2.47) compared to standard LiNbO₃. While full electro-optic tensor calculations (Pockels/Kerr effects) remain necessary to rigorously confirm device performance, these predictions highlight the K₂AgIrX₆ series—particularly the iodide variant—as promising lead-free candidate for photovoltaics, thermoelectrics, and integrated photonic devices.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"58 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TiTeOs for optical telecommunications and waste-heat energy harvesting: a first-principles study","authors":"S. Chibani,&nbsp;M. Khedidji,&nbsp;M. Rechache,&nbsp;O. Arbouche","doi":"10.1007/s11082-026-09169-5","DOIUrl":"10.1007/s11082-026-09169-5","url":null,"abstract":"<div><p>The structural, elastic, dynamical, electronic, optical, and thermoelectric transport properties of the half-Heusler compound TiTeOs were investigated using first-principles calculations combined with semiclassical Boltzmann transport theory. Structural optimization confirms the energetic stability of the cubic phase, while the calculated elastic constants satisfy the mechanical stability criteria and the phonon dispersion shows no imaginary frequencies, confirming dynamical stability. The compound exhibits a direct semiconducting band gap of 1.19 eV within the TB-mBJ approach. The inclusion of spin–orbit coupling produces only a small reduction in the band gap to approximately 1.16 eV and does not significantly modify the overall band dispersion. The calculated optical response shows moderate dielectric screening, refractive-index dispersion, and an absorption onset consistent with the near-infrared electronic gap. The thermoelectric transport properties exhibit a large Seebeck coefficient and favorable trends in the relaxation-time-scaled electrical conductivity, electronic thermal conductivity, and power factor. The electronic figure of merit, <span>({ZT}_{E}={S}^{2}sigma T/{}_{e})</span>, approaches unity near optimal chemical potentials at room temperature and should therefore be interpreted as an indicator of the intrinsic electronic transport potential rather than the complete thermoelectric figure of merit. In addition, the lattice thermal conductivity was estimated using the Slack model and shows a decreasing trend with increasing temperature. Overall, the combined optical and thermoelectric characteristics indicate that TiTeOs is a theoretically promising multifunctional material for further investigation in optoelectronic and thermoelectric applications.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"58 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and engineering of a metal-insulator-metal waveguide plasmonic sensor with high-figure-of-merit for refractive index measurement","authors":"Mehrdad Nazari,&nbsp;Milad Panahi Ramazanloo,&nbsp;Hamid Heidarzadeh,&nbsp;Ali Khodaie","doi":"10.1007/s11082-026-09174-8","DOIUrl":"10.1007/s11082-026-09174-8","url":null,"abstract":"<div><p>This paper presents the design and engineering of a metal-insulator-metal (MIM) waveguide plasmonic sensor incorporating rectangular-ring resonators for high-precision refractive index measurement. Using finite-difference time-domain (FDTD) simulations, the authors systematically investigated the influence of key geometrical parameters including resonator dimensions, ring width, and coupling length on the sensor’s spectral response, sensitivity, and figure of merit (FOM). The three-stage (triple-ring) configuration demonstrated significantly enhanced field confinement and light–matter interaction, producing sharper and deeper resonance dips compared to simpler designs. Three distinct resonance modes were identified. Among these, the third mode achieved the highest performance, with a sensitivity of 830 nm/RIU and an exceptionally high FOM of 286.20 RIU⁻¹, attributed to its narrow full width at half maximum (FWHM) of only 2.9 nm. Even the lowest recorded FOM exceeded those of many recently reported plasmonic sensors. Parametric analysis revealed that the first-layer length (L₁) and coupling distance (d) substantially affect resonance behavior, while waveguide width (w) has minimal influence. Strong mode confinement along the central axis was confirmed through electric field distributions. Overall, the proposed sensor achieves an optimal balance between high sensitivity and ultra-narrow spectral linewidth, establishing a new benchmark for high-resolution, label-free biosensing, particularly suited for detecting minute refractive index changes in complex biological or environmental samples.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"58 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149132514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gauge-field-enabled nonreciprocity and entanglement in a tunable hybrid magnomechanical platform","authors":"Mahdieh Pourjafarabadi,&nbsp;Ali Asghari Nejad,&nbsp;Yaser Abdi","doi":"10.1007/s11082-026-09146-y","DOIUrl":"10.1007/s11082-026-09146-y","url":null,"abstract":"<div><p>Efficient and nonreciprocal transducers are essential for interconnecting superconducting quantum processors through optical channels in scalable quantum networks. Direct electro-optical conversion suffers from inherent limitations in efficiency and bandwidth. Here, we propose a hybrid magnomechanical platform based on a YIG resonator that enables robust nonreciprocal microwave-to-optical conversion and controlled quantum entanglement distribution. A shared mechanical mode mediates interactions between the microwave cavity, optical cavity, and magnon mode, avoiding direct microwave–magnon coupling. By engineering a synthetic gauge flux of ±π/2, we achieve strong nonreciprocity with forward transmission reaching 0.9 near resonance. A comprehensive noise analysis establishes that operation below 100 mK is essential to maintain spectral noise contribution below 0.9%. We further investigate steady-state entanglement and observe a clear hierarchy of thermal robustness: optomechanical entanglement persists up to 350 mK, microwave–optical up to 320 mK, microwave–mechanical up to 250 mK, while all magnon-mediated entanglements decay within 30–40 mK. Stability and physicality checks confirm the validity of our results, though the required parameter regime is confined to a narrow detuning window. This versatile platform demonstrates the potential of hybrid magnomechanical systems for scalable quantum information processing.</p></div>","PeriodicalId":720,"journal":{"name":"Optical and Quantum Electronics","volume":"58 12","pages":""},"PeriodicalIF":4.0,"publicationDate":"2026-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149027639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}