Results in Optics最新文献

Laser-assist β− CO2 in mixed environment 混合环境中激光辅助β - CO2

IF 3

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-05-04 DOI: 10.1016/j.rio.2026.101027

Santosh Kumar Das , Saddam Husain Dhobi , Kishori Yadav , Suresh Prasad Gupta

{"title":"Laser-assist β− CO2 in mixed environment","authors":"Santosh Kumar Das , Saddam Husain Dhobi , Kishori Yadav , Suresh Prasad Gupta","doi":"10.1016/j.rio.2026.101027","DOIUrl":"10.1016/j.rio.2026.101027","url":null,"abstract":"<div><div>Laser assisted scattering (LAS) refers to the incident particle such as electrons or β<sup>−</sup> particle or atoms with a target in the presence of laser field. It plays crucial role in several areas including laser cooling, medical lasers applications, nanotechnology and control of atomic-scale processes. The objective this work is to analyze differential cross-section (DCS) of β<sup>−</sup> particle (electrons) with CO<sub>2</sub> molecule in the presence of monochromatic laser and thermal environment. In this study, the theoretical model was developed using Kroll-Watson approximation with the help of thermal Volkov wave function, vector potential and scattering potential for CO<sub>2</sub> molecule. The developed model is based on S-matrix and T-matrix which help to study the DCS (nature of beta particle with CO<sub>2</sub> molecule). The developed model of DCS was computed to study the effect of different parameters like momentum, scattering angle, distance separation, temperature, energy of thermal electron before and after scattering. The computed nature of DCS shows sinusoidal with scattering angle, while with change in momentum exhibits damping nature<strong>.</strong> Also, the observation shows the DCS increases with separation distance, scattered thermal energy and temperature, but decreases with incident thermal energy. The results shows that thermal environment effect the nature of β<sup>−</sup> particle with CO<sub>2</sub> molecule. The findings may contribute to improved understanding of laser assisted scattering processes at the atomic level and their potential applications in technologies related to carbon-based systems in laser and thermal environment.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"24 ","pages":"Article 101027"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147850838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optical and magnetic characteristics of rare-earth- Sm3+ ion substituted Cobalt nano crystalline ferrites for optoelectronic applications 稀土- Sm3+离子取代钴纳米晶体铁氧体光电子应用的光学和磁性

IF 3

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-03-22 DOI: 10.1016/j.rio.2026.101008

Lakkoju Santosh Kumar , K.V. Ramesh , Davuluri Venkatesh

{"title":"Optical and magnetic characteristics of rare-earth- Sm3+ ion substituted Cobalt nano crystalline ferrites for optoelectronic applications","authors":"Lakkoju Santosh Kumar , K.V. Ramesh , Davuluri Venkatesh","doi":"10.1016/j.rio.2026.101008","DOIUrl":"10.1016/j.rio.2026.101008","url":null,"abstract":"<div><div>This study comprehensively investigated the optical characteristics of samarium-doped cobalt nano-ferrites synthesized via sol–gel auto-combustion for optoelectronic applications. Structural analysis of the samples was performed using X-ray diffraction, which confirmed the formation of a spinel structure. The lattice constants increased with the addition of Sm<sup>3+</sup> ions and were in the range of 8.3724 – 8.3810 Å. UV–Vis spectroscopy revealed that the direct optical bandgap varied between 2.211 and 2.331 eV, while the indirect bandgap ranged from 1.145 to 1.206 eV, confirming the semiconducting nature of the materials. Urbach energy measurements revealed lattice disorder effects. The transmittance, reflectance, extinction coefficient, and refractive index were evaluated to assess the potential of the optical devices. The samples exhibited complex refractive index behavior and optical permittivity, which are suitable for high-frequency applications. The optical conductivity and density peaked at 10% Sm doping. Surface plasmon effects were observed, with the quality factors decreasing at 15% doping due to quantum confinement. Magnetic measurements showed that the saturation magnetization (M<sub>s</sub>) decreased from 46.76 to 38.92 emu/g, and the coercivity (H<sub>c</sub>) varied between 1012 and 1186 Oe with the Sm<sup>3+</sup> concentration. This was attributed to spin disorder, except for an anomalous increase of 15%, possibly due to the formation of a secondary phase. These results indicate that Sm<sup>3+</sup> substitution effectively tunes both the optical and magnetic behaviors, making these ferrites promising materials for high-frequency, optoelectronic, and spintronic applications.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"24 ","pages":"Article 101008"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultra-broadband polarization-independent metamaterial absorber from UV-C to LWIR: design and optimization UV-C - LWIR超宽带非极化超材料吸收体的设计与优化

IF 3

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-03-23 DOI: 10.1016/j.rio.2026.101012

Valiolah Pourhossein Bagheri , Hamed Saghaei , Alireza Ghorbani

{"title":"Ultra-broadband polarization-independent metamaterial absorber from UV-C to LWIR: design and optimization","authors":"Valiolah Pourhossein Bagheri , Hamed Saghaei , Alireza Ghorbani","doi":"10.1016/j.rio.2026.101012","DOIUrl":"10.1016/j.rio.2026.101012","url":null,"abstract":"<div><div>This study presents the design and optimization of a polarization-independent ultra-broadband metamaterial absorber operating over an exceptionally wide spectral span from 150 nm (UV-C) to 10,000 nm (long-wave infrared). The proposed unit cell integrates elliptical titanium (Ti) and aluminum oxide (Al<sub>2</sub>O<sub>3</sub>) resonators with a multilayer stack composed of chromium (Cr), silicon monoxide (SiO), and iron (Fe), enabling strong plasmonic resonances, enhanced impedance matching, and efficient electromagnetic energy confinement across ultraviolet, visible, near-infrared, and infrared bands. A particle swarm optimization framework was employed to refine the geometric parameters via systematic parameter sweeps and an iterative global search, aiming to maximize the average absorptance over the full wavelength range. Numerical simulations based on the finite-difference time-domain method show that the optimized structure achieves an average absorption of 96.82% via stepwise optimization and 97.12% via simultaneous multi-parameter optimization, representing a substantial enhancement relative to the initial pre-optimized baseline of 86.09%. Electric- and magnetic-field distribution analyses reveal pronounced plasmonic hot-spot formation at metal–dielectric interfaces and confirm stable polarization-insensitive performance under both TE and TM excitations, consistent with the nearly overlapping absorption spectra for the two polarization states. Owing to its ultra-wide spectral coverage and robust polarization independence, the proposed absorber is a promising platform for broadband solar energy harvesting, multispectral sensing, thermal imaging, and infrared energy management.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"24 ","pages":"Article 101012"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural, magnetic and optical properties of functionally tailored TiO2 nanoparticles 功能定制TiO2纳米粒子的结构、磁性和光学性质

IF 3

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-04-03 DOI: 10.1016/j.rio.2026.101016

Sanjay Kumar , Virendra Kumar , Manoj Kumar Bansal , Arvind Mishra , Chandra Shakher Pathak

{"title":"Structural, magnetic and optical properties of functionally tailored TiO2 nanoparticles","authors":"Sanjay Kumar , Virendra Kumar , Manoj Kumar Bansal , Arvind Mishra , Chandra Shakher Pathak","doi":"10.1016/j.rio.2026.101016","DOIUrl":"10.1016/j.rio.2026.101016","url":null,"abstract":"<div><div>We report Pristine TiO<sub>2</sub> (Titanium dioxide) and synthesis of its doped variants with Mn and Fe i.e. Ti<sub>0.98</sub>Mn<sub>0.02</sub> (manganese doped Titanium dioxide) and Ti<sub>0.98</sub>Fe<sub>0.02</sub> (iron doped Titanium dioxide) by solid-state reaction method in this study. The experiments were sintered at temperature 500 °C. Without the production of any impurity phases, X-ray diffraction investigations show the formation of the anatase phase of TiO<sub>2</sub> fitting to the 141/amd space set in both samples. The crystal structure does not change when 2% Mn content is added, revealing the precise replacement of Mn & Fe atoms at their locations. The variation in ionic radii is responsible for some of the observed changes in lattice characteristics and crystallite dimension in Mn & Fe-doped structures. The size of the crystallites as determined by X-ray diffraction analysis is comparable with the grain size as determined by scanning electron micrographs. The integration of Mn and Fe content in the TiO<sub>2</sub> structure has been verified by energy-dispersive X-ray analysis. Ferromagnetic behavior found in Mn and Fe-doped TiO<sub>2</sub> composition is consistent with the significant contribution of the Mn d-shell. The field of electric polarization (P–E) have a very low energy loss, according to hysteresis loops. The findings demonstrate that the sintering temperature and atmosphere had a significant impact on the magnetic properties.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"24 ","pages":"Article 101016"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Defect-driven photoluminescence quenching in WO3 micro-flakes: a simple approach for bisphenol A detection WO3微片中缺陷驱动的光致发光猝灭：一种检测双酚a的简单方法

IF 3

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-04-24 DOI: 10.1016/j.rio.2026.101020

Hamood Al Shidhani , Basim Al Farsi , R.G. Sumesh Sofin , Faisal Al Marzouqi , Zainab B. Al-Ruqaishi , Abey Issac , Osama K Abou-Zied , Mohammed Z. Al-Abri , S.R. Sirasanagandla

{"title":"Defect-driven photoluminescence quenching in WO3 micro-flakes: a simple approach for bisphenol A detection","authors":"Hamood Al Shidhani , Basim Al Farsi , R.G. Sumesh Sofin , Faisal Al Marzouqi , Zainab B. Al-Ruqaishi , Abey Issac , Osama K Abou-Zied , Mohammed Z. Al-Abri , S.R. Sirasanagandla","doi":"10.1016/j.rio.2026.101020","DOIUrl":"10.1016/j.rio.2026.101020","url":null,"abstract":"<div><div>Accurate and simple detection of environmentally hazardous molecules such as bisphenol A (BPA) remains a significant challenge in optical sensing. This study presents a novel approach utilizing photoluminescence (PL) spectroscopy of tungsten trioxide (WO<sub>3</sub>) micro-flakes synthesized via a solution-phase route, with enhanced sensitivity achieved through controlled annealing. The annealing process at 350 °C under low vacuum induces a phase transition from orthorhombic to monoclinic structure and increases oxygen vacancy concentrations, which are direction dependent within the crystal lattice. These vacancies act as emission centers, whose PL response is modulated by BPA concentrations, resulting in measurable quenching effects. Theoretical predictions of charge transition levels (CTLs) identify the key emission centers responsible for the observed optical behavior. The method achieves a detection limit of 0.025 μmol/L, demonstrating sensitivity comparable to other complex analytical techniques, while offering advantages in simplicity and real-time monitoring. The underlying quenching mechanism involves electron transfer from oxygen vacancies to BPA’s H<sup>+</sup> ions, confirming a static quenching pathway. The present work primarily demonstrates the feasibility of defect-engineered WO<sub>3</sub> as a model optical transducer for BPA through a vacancy-mediated quenching mechanism, that can serve as a foundation for future selectivity and real-sample studies. This work advances optical sensing by coupling crystal structure engineering with PL spectroscopy, providing an efficient and practical platform for environmental and health monitoring of biohazardous molecules.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"24 ","pages":"Article 101020"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147799028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tuning the defect state color centers in CaO powder and wafer by using hard X-ray nanoprobe 用硬x射线纳米探针对CaO粉和晶圆中的缺陷态色心进行了调谐

IF 3

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-04-23 DOI: 10.1016/j.rio.2026.101022

Sunny Saurabh , Tzu-Chi Huang , Wei-Lun Wei , Chen-Wei Lin , Yi-Chen Li , Yu-Hao Wu , Chien-Yu Lee , Bo-Yi Chen , Gung-Chian Yin , Mau-Tsu Tang , Bi-Hsuan Lin

引用次数: 0

High stability and low timing jitter passively Q-switched microchip lasers pumped with high repetition-rate square pulses 高稳定性和低时序抖动被动调q微芯片激光器抽运高重复率的方脉冲

IF 3

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-04-23 DOI: 10.1016/j.rio.2026.101021

Yuxiang Dong , Xingyu Zhu , Xiaoqin Zhu

{"title":"High stability and low timing jitter passively Q-switched microchip lasers pumped with high repetition-rate square pulses","authors":"Yuxiang Dong , Xingyu Zhu , Xiaoqin Zhu","doi":"10.1016/j.rio.2026.101021","DOIUrl":"10.1016/j.rio.2026.101021","url":null,"abstract":"<div><div>High peak-power laser pulses generated in the passively Q-switched (PQS) solid-state lasers have been widely used in material processing, optical communication, imaging, and ranging. PQS microchip lasers are well developed for generating high peak-power, nanosecond or sub-nanosecond pulses, however, it is a big challenge for achieving stable laser pulses in the PQS microchip lasers. Here, PQS microchip lasers are fabricated using Nd:YAG and Cr<sup>4+</sup>:YAG crystals as core components. Specifically, two Nd:YAG crystals with thicknesses of 1 mm and 2 mm serve as gain media, while three Cr<sup>4+</sup>:YAG crystals with distinct thicknesses and initial transmittances function as saturable absorbers. Under high-repetition-rate pulsed laser excitation, the PQS microchip lasers reliably produce highly stable Q-switched laser pulses. The generated laser pulses exhibit amplitude fluctuation and timing jitter of less than 1.5% and 0.7%, respectively. Stable single pulses with 10 μJ energy, 1.6 ns width, and 6.25 kW peak power are achieved in the PQS microchip laser pumped by 10 kHz repetition-rate pulses with 40 μs duration. When pumped by 20 kHz, 20 μs pulses, the PQS microchip laser generates stable dual pulses: the main pulse delivers 9.15 μJ energy, 2.3 ns width, and 4 kW peak power, while the satellite pulse features 2.5 ns width and 1.7 kW peak power. The 1064 nm laser pulses are further converted to stable 532 nm pulses via second-harmonic generation, and synchronization between the two wavelengths is realized, enabling potential applications in dual-wavelength high-resolution imaging.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"24 ","pages":"Article 101021"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147741350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband configurable perfect absorber based on surface patterned graphene sheet in THz region 基于表面图案化石墨烯片的太赫兹区宽带可配置完美吸收体

IF 3

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-03-23 DOI: 10.1016/j.rio.2026.101010

Soheil Hadipour, Pejman Rezaei, Shiva Khani

{"title":"Broadband configurable perfect absorber based on surface patterned graphene sheet in THz region","authors":"Soheil Hadipour, Pejman Rezaei, Shiva Khani","doi":"10.1016/j.rio.2026.101010","DOIUrl":"10.1016/j.rio.2026.101010","url":null,"abstract":"<div><div>In this study, a novel wideband metamaterial absorber is proposed, and its underlying operational mechanism is thoroughly analyzed. The suggested structure consists of a highly conductive gold substrate, Rogers RT5880LZ as the middle-insulated dielectric, and a circular enclosure with a square-shaped graphene layer, from bottom to top, respectively. The perks of our work are that this absorber is configurable and contains solely a simple-designed graphene layer, offering the benefits of simple implementation, affordability, and frequency tunability. Additionally, graphene is a tunable metamaterial; the results demonstrate that the recommended absorber can be used in wide-band applications without requiring geometrical reconfiguration, and due to external DC bias voltage, which adjusts graphene conductivity. First, the circular-shaped absorber is provided. Then by adding ribbon to our preliminary design, the absorption bandwidth grows to approximately 2 THz. Our design is symmetrical; this feature affects polarization sensitivity. The presented absorber demonstrates strong potential for filtering applications, communication and information security, imaging, and sensing material characterization applications.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"24 ","pages":"Article 101010"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Plasmon-coupled graphene nanoantenna arrays for high-responsivity and tunable terahertz photodetection 用于高响应性和可调谐太赫兹光探测的等离子体耦合石墨烯纳米天线阵列

IF 3

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-03-27 DOI: 10.1016/j.rio.2026.101011

Arash Vaghef-Koodehi , Zeinab Gholizadeh

{"title":"Plasmon-coupled graphene nanoantenna arrays for high-responsivity and tunable terahertz photodetection","authors":"Arash Vaghef-Koodehi , Zeinab Gholizadeh","doi":"10.1016/j.rio.2026.101011","DOIUrl":"10.1016/j.rio.2026.101011","url":null,"abstract":"<div><div>Efficient room–temperature terahertz (THz) photodetection remains a critical prerequisite for emerging applications in imaging, spectroscopy, and wireless communication. In this work, we present a plasmon–coupled graphene photodetector that integrates a periodic array of gold nanoantennas to achieve broadband and gate–tunable THz response. The device architecture was investigated using self–consistent finite–difference time–domain (FDTD) and finite–element (FEM) simulations, revealing a local electric–field enhancement of approximately 40 × at the graphene–antenna interface. This strong plasmonic coupling leads to high theoretical performance metrics, including a peak voltage responsivity of 175  V W⁻<sup>1</sup> at 2 THz, a noise–equivalent power below 2 pW/√Hz , and wideband operation across 0.5–5 THz. The spectral response can be dynamically tuned by electrostatic control of the graphene Fermi level (0.1–0.4  eV) under moderate gate bias, enabling adaptive detection and multispectral functionality. These findings demonstrate a scalable and practical pathway toward the development of room-temperature, tunable terahertz photodetectors based on plasmonically coupled graphene nanoantenna arrays. The proposed architecture offers significant promise for next-generation sensing and communication systems, with performance metrics that position it as a compelling candidate for versatile THz device platforms.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"24 ","pages":"Article 101011"},"PeriodicalIF":3.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147652261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Active illumination for holographic imaging through a scatterer 通过散射器进行全息成像的主动照明

IF 3

Results in Optics Pub Date : 2026-03-01 Epub Date: 2026-04-15 DOI: 10.1016/j.rio.2026.101018

Tanushree Karmakar , Prateek Agrawal , Zeev Zalevsky , Rakesh Kumar Singh

引用次数: 0