Results in Optics最新文献

{"title":"Optical dual gas sensor for biomedical monitoring of NO and O2 based on electrospun fibers containing CsPbBr3 QDs and PtTFPP","authors":"Rispandi ,&nbsp;Cheng-Shane Chu ,&nbsp;Sri Nugroho ,&nbsp;Muhammad Imam Ammarullah","doi":"10.1016/j.rio.2025.100781","DOIUrl":"10.1016/j.rio.2025.100781","url":null,"abstract":"<div><div>This study presents the design and development of an innovative optical dual gas sensor tailored for biomedical applications, enabling the simultaneous detection of nitric oxide (NO) and oxygen (O₂), critical biomarkers in physiological monitoring. The sensor leverages electrospun fibers embedded with CsPbBr₃ quantum dots (QDs) and platinum(II) <em>meso</em>-tetrakis(pentafluorophenyl) porphyrin (PtTFPP), offering a novel approach to enhancing gas-sensing capabilities. Electrospinning produces highly porous, uniform cellulose acetate fibers under optimized conditions (5 mL/hour flow rate, 17 kV supply voltage, 15 cm working distance), creating a biocompatible matrix that enhances sensor stability and responsiveness. The sensor is excited by a UV LED light source at 380 nm, with fluorescence intensities measured via spectrometry. It demonstrates excellent sensitivity, with maximum sensitivities of 4.2 for nitric oxide and 7.6 for oxygen, and rapid response/recovery times of 90 s/119 s for nitric oxide and 61 s/66 s for oxygen, respectively. These findings highlight the sensor’s potential for high-sensitivity, selective, and fast-response gas detection, making it a promising tool for real-time monitoring of respiratory gases and other biomedical applications.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100781"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of titanium dopant concentration on structure, optical band gap and thermoluminescence (TL) properties of LiF:Mg,Ti","authors":"H.R. Baghani ,&nbsp;M. Goli ,&nbsp;E. Koushki ,&nbsp;M. Robatjazi","doi":"10.1016/j.rio.2025.100778","DOIUrl":"10.1016/j.rio.2025.100778","url":null,"abstract":"<div><div>In this study, lithium fluoride doped with magnesium and titanium (LiF:Mg,Ti) powders were synthesized chemically and where used as thermoluminescence dosimeter (TLD) applications. In order to improve thermoluminescence (TL) properties of powders, different percentages of titanium were used in the structures. Different methods were used to characterization of the synthesized powders, such as X-ray diffraction (XRD) method, SEM, FTIR and UV–Visible spectroscopy. Band gap energy of the powders was obtained about 5.4–5.7 eV. It was observed that by increasing the amount of titanium up to a certain amount, the number of electron traps and as a result, the intensity of TL light increases. With the further increase of titanium dopant, the radiation intensity decreases, which can be due to the saturation and destruction of the structure of traps by creating excess traps. Results of this study can be important in the engineering and design of TLDs with higher TL efficiency.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100778"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of a multilevel micro/nano-plastics Infrared Spectroscopy using optical chopper modulation and induced anti-stokes shift techniques","authors":"Samuel Nlend,&nbsp;Sune Von Solms,&nbsp;Johann Meyer","doi":"10.1016/j.rio.2025.100775","DOIUrl":"10.1016/j.rio.2025.100775","url":null,"abstract":"<div><div>This paper explores the provision of an all-in-one IR-spectroscopy platform for nanoplastics as well as less than 10<span><math><mi>μ</mi></math></span> m microplastics size, aiming to surpass the current limit of <span><math><mrow><mn>20</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>. For such a multilevel spectroscopy, we propose an optical chopper configuration that produces multilevel modulation of laser source, and an induced anti-Stokes shift technique that adds energy in a sample assumed to contain microplastics, their degraded form, and their possible retention. We control reduction of the source energy flux using a splitter, and a linear edges’ chopper, whose windows alternate between empty and filled with a transmitting but high absorbance nanotube material spaces, while controlling the sample emission using an induced Anti-Stokes shift. This yields two methods: vibrational/rotational and electronic transitions. The first method provides us with the absorbance against energy of a sample assumed to contain compounds made of CC, CH, CO, CN, xH. The second method defines the set of lower bandpass of the assumed diffraction grating entry from the wavelengths emitted, from where the bandpass are derived. The new geometrical chopper’s configuration, and its transmitted signals for a flux distribution are given. The IR source energy and the induced hot-band, both suitable for the multilevel bandpass for the detection of nano/micro-plastics and their retained nanoparticles spectroscopy are discussed. We obtain bandpass by scaling down the wavelengths which vary only when both energy sources vary for any allowed atomic energy level, and we characterize the absorbance of nanoparticles components in near-IR region.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100775"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical modeling of a helical TE CO2 laser with a long output pulse","authors":"Sh. Al-Hawat,&nbsp;S. Al-Sheikh Salo","doi":"10.1016/j.rio.2025.100777","DOIUrl":"10.1016/j.rio.2025.100777","url":null,"abstract":"<div><div>A previous computational program written in FORTRAN was modified to characterize a homemade helical transversely excited (TE) CO₂ laser with a long output pulse.</div><div>The power and intensity of the laser output pulse, the laser levels population and population inversion between two effective vibrational levels (00⁰1) and (10⁰0) of the laser, in addition to the temperatures of these levels and laser gain factor and the excitation rates and laser pulse energy were calculated for pressure varied between 45 and 85 mbar and voltage between 9 and 12 kV with a mixture ratio of CO₂:N₂:He = 1:1:3.</div><div>A comparison between the measured and calculated energy and power of the laser output pulse was carried out, and gave a good agreement between them. Among the results, the maximum power reached 198 W, with pulse duration of 80 µs, and pulse energy of 15.48 mJ corresponding to pressure 85 mbar and voltage of 10 kV.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100777"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An affordable smartphone interrogatable polarimetric fiber optic current sensor","authors":"Tinko Eftimov ,&nbsp;Georgi Dyankov ,&nbsp;Kristian Nikolov ,&nbsp;Petar Kolev ,&nbsp;Daniel Brabant ,&nbsp;Awa Sow","doi":"10.1016/j.rio.2024.100767","DOIUrl":"10.1016/j.rio.2024.100767","url":null,"abstract":"<div><div>In this paper we describe a low cost polarimetric optical fiber sensor based on a BSO magneto-optic crystal and plastic fibers spectrally interrogated with a smartphone. We analyze the spectral and the intensity distortions introduced by the smartphone. The transmission spectra of the RGB filters were measured. Power law dependent distortions of the RGB pixels intensity responses was established. To overcome the jitter and the rescaling problems of the camera a simple scheme for wavelength calibration is proposed and successfully tested. The advantages and issues related to smartphone interrogation vs. spectrometer interrogation are discussed.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100767"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New photochromic spectacle lenses improve glare discomfort and photostress recovery","authors":"Jacob B. Harth ,&nbsp;Billy R. Hammond ,&nbsp;Cameron J. Wysocky ,&nbsp;Lisa M. Renzi-Hammond","doi":"10.1016/j.rio.2024.100763","DOIUrl":"10.1016/j.rio.2024.100763","url":null,"abstract":"<div><h3>Purpose</h3><div>To investigate the influence of a new photochromic spectacle lens on glare discomfort (GD) and photostress recovery time (PRT) in normal healthy subjects. A subject-masked within-subject comparison was performed using the fully activated state of Transitions® Gen S^TM and clear control.</div></div><div><h3>Methods</h3><div>30 participants (<em>M</em> = 19.2 ± 1.3 years) were tested. GD was assessed both physically, by measuring palpebral fissure size, and subjectively, via a 5-point Likert scale. PRT was measured as the amount of time necessary to regain visual function after an intense (∼15 % bleach) 5-second exposure to a broadband (emulated sunlight) light stressor.</div></div><div><h3>Results</h3><div>GD, measured both physically and subjectively was significantly reduced (<em>p</em> &lt; 0.001) when participants viewed the stimulus through the test lens compared to the clear control lens. PRT was also significantly reduced when using the test lens (<em>p</em> &lt; 0.001).</div></div><div><h3>Conclusions</h3><div>These data are consistent with past findings but show that they apply to a commonly used photochromic tint. The results highlight the potential of specialized lenses to enhance visual comfort and performance in varying lighting conditions.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100763"},"PeriodicalIF":0.0,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of birefringent Bragg gratings waveguides inscribed with the Femtoprint device","authors":"M.Tunon de Lara ,&nbsp;L.Amez Droz ,&nbsp;K. Chah ,&nbsp;P. Lambert ,&nbsp;C. Collette ,&nbsp;C. Caucheteur","doi":"10.1016/j.rio.2024.100764","DOIUrl":"10.1016/j.rio.2024.100764","url":null,"abstract":"<div><div>Since their advent, femtosecond (fs) laser pulses have been effectively employed to create micro and nano structures within host materials, such as silica glass. Their application is of growing interest in the fields of photonics and optomechanics and numerous achievements have been obtained to date. The technology has matured to such a degree that automated production processes like the FemtoPrint machine are now commercially available. While dealing with such powerful tools, users need to optimize the energy per pulse and polarization state to create effective structures on purpose. Thereby, studying the effect of these parameters on the relative quality of the fs laser pulses-engineered structures is of prime importance and can bring assistance or even a useful methodology for the scientific community using this tool or an equivalent technique. In this study, our focus revolves around exploring the characteristics of optical waveguides and in-built Bragg gratings created with the Femtoprint process in a flat glass substrate to extract pertinent information regarding their physical and optical properties, such as dimensions, refractive index modulation and birefringence. To that aim, we rely on three advanced methodologies: Digital holographic Microscope (DHM) analysis, polarization-based spectral measurements and infrared camera imaging, respectively. This analysis reveals important findings about the actual implemented refractive index modulation. For the investigated pulse energy (130 nJ), repetition rate (1 MHz) and scanning speed of the fs laser pulses beam, we show that the refractive index modification in the waveguide determined by DHM analysis lies in the range of 10^-3. This value is the highest reported so far in waveguides at this relatively low energy and high repetition rate of the laser pulses. Besides, the Bragg grating inscribed in the waveguide shows a spectral separation between the Bragg modes (300 pm) corresponding to an effective birefringence of the waveguide of 1.36 10^-4. This value depends on the polarization of the writing beam with respect to the scanning direction.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100764"},"PeriodicalIF":0.0,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing satellite networks with deep reinforcement learning: A focus on IoT connectivity and dynamic resource management","authors":"Arun Kumar ,&nbsp;Nishant Gaur ,&nbsp;Sumit Chakravarthy ,&nbsp;Aziz Nanthaamornphong","doi":"10.1016/j.rio.2024.100765","DOIUrl":"10.1016/j.rio.2024.100765","url":null,"abstract":"<div><div>The integration of satellite-based networks into our communication infrastructure is increasingly becoming standard practice, driven by the widespread adoption of 5G technologies and the escalating demand for continuous content delivery. Achieving this integration efficiently necessitates significant improvements in reducing latency and enhancing data throughput. In response to these challenges, we propose the development of a specialized satellite architecture alongside a novel algorithm focused on call access and admission control within Low Earth Orbit (LEO) satellite systems. This solution leverages an Artificial Intelligence (AI) driven approach, employing a Deep Reinforcement Learning (DRL) agent to automate satellite operations through advanced beam localization techniques. Furthermore, we introduce a beam protocol that seamlessly integrates this automated learning mechanism into its operational framework. The efficacy of our proposed algorithm is rigorously evaluated through simulation studies of a multibeam satellite system, demonstrating the potential of Deep Reinforcement Learning in facilitating dynamic resource allocation with improved efficiency.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100765"},"PeriodicalIF":0.0,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aluminum as a competitive plasmonic material for the entire electromagnetic spectrum: A review","authors":"S. Shukla ,&nbsp;P. Arora","doi":"10.1016/j.rio.2024.100760","DOIUrl":"10.1016/j.rio.2024.100760","url":null,"abstract":"<div><div>With plasmonics taking the lead in most sensing applications, research has geared towards alternative, cost-effective materials that can strive for large-scale production along with CMOS compatibility. Aluminum (Al) is among those competitive plasmonic metal films that have seen unprecedented research in recent years. The ability to exhibit appreciable plasmonic response in the entire electromagnetic spectrum has been reported along with improved performance sensing parameters. This review article covers different aspects of Al-based nanostructures, nano-films, and nano-particles in different wavelength regimes, displaying efficient plasmonic sensing for myriad purposes. A comprehensive review is conducted to explore the diverse and exciting possibilities emerging from Al-based tunable plasmons at the metal-dielectric interface. Al has already entered many applications, from on-chip plasmonic integration to point-of-care diagnosis. Thus, the application of Al in wide applications (heath, fluorescence, image-filtering techniques, and many more) is discussed here, along with the corresponding limitations and future scope associated with them.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100760"},"PeriodicalIF":0.0,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization and performance analysis of n-ZnO/p-CdTe thin heterojunction solar cells via two-dimensional numerical simulation","authors":"Mohamed Manoua,&nbsp;Ahmed Liba","doi":"10.1016/j.rio.2024.100761","DOIUrl":"10.1016/j.rio.2024.100761","url":null,"abstract":"<div><div>The unique properties of cadmium telluride (CdTe) and zinc oxide (ZnO) semiconductors suggest promising photovoltaic performance for n-ZnO/p-CdTe heterojunctions. In this work, two-dimensional numerical simulation was utilized to study and optimize n-ZnO/p-CdTe thin heterojunction solar cells, aiming to demonstrate the highest achievable conversion efficiency for this simple structure. The effects of CdTe acceptor concentration, CdTe thickness, ZnO thickness, ZnO band-gap, ZnO donor concentration, defect density in ZnO layer, and interface defects density on the photovoltaic performance of n-ZnO/p-CdTe heterojunction were investigated under standard illumination conditions (AM1.5, 100 mW/cm²). The results revealed significant sensitivity of the photovoltaic performance to variations in CdTe acceptor and ZnO donor concentrations. Additionally, the optimal thicknesses for CdTe and ZnO were found to be 3 µm and 250 nm, respectively. Consequently, these optimal parameters yielded the following photovoltaic parameter values: J_SC = 22.73 mA/cm², V_OC = 1.056 V, FF = 85.73 %, and η = 20.57 %, for a ZnO donor concentration of 10²¹ cm⁻³ and a CdTe acceptor concentration of 10¹⁷ cm⁻³. The analysis of ZnO bandgap energy, adjusted through Mg doping, shown that a slight increase in efficiency occurs at a band gap of 3.75 eV, corresponding to about 20 % Mg content. However, these performances deteriorate significantly when the defect density in the ZnO layer exceeds 5 <span><math><mo>×</mo></math></span> 10¹⁵ cm⁻³ or when the interface defect density rises above 10¹² cm⁻².</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100761"},"PeriodicalIF":0.0,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}