Results in Optics最新文献

{"title":"Atomistic modulating of structural, elastic, and optoelectronic behavior of pure TiO2 and Fe/TiO2 for photoelectrochemical water splitting application","authors":"Junaid Khan ,&nbsp;Matiullah Khan ,&nbsp;Waqar Uddin ,&nbsp;Paghunda ,&nbsp;Fida Rehman ,&nbsp;Abdul Hakim Shah ,&nbsp;Atta Ur Rahman ,&nbsp;Zeshan Ahmad","doi":"10.1016/j.rio.2024.100730","DOIUrl":"10.1016/j.rio.2024.100730","url":null,"abstract":"<div><p>Titanium dioxide (TiO₂) has attracted much attention because of their desirable physicochemical properties especially in the water splitting process. In this work pure and Fe-doped TiO₂ compounds are studies theoretically with the help of Generalized Gradient Approximation with the revised Pardew–Burke–Ernzerh (RPBE) exchange–correlation scheme. Total Density of States (TDOS) and Partial Density of States (DOS) were analyzed in detail which show that iron (Fe) and oxygen (O) orbitals hybridize, especially in the region of the doping system conduction band minima for both modes. Additionally, this interaction produces an energy level that effectively reduces the bandgap of the adsorbed system. Optical properties were elucidated which shows that Fe-doped TiO₂ system results in high absorption and photoconductivity. Moreover, the results demonstrate low bandgap energy which is suitable for the reduction in water splitting without the need for external energy. Magnetic properties demonstrated that Fe-doped TiO₂ systems show very low diamagnetic responses. The calculated elastic properties of Fe-doped TiO₂ indicate ductile nature of the material with a strong average bond strength. Fe-doped TiO₂ exhibited less microcracks with a mechanically stable composition.</p></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"16 ","pages":"Article 100730"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124001275/pdfft?md5=2f2057f0b4202afa45d22fc949f74810&pid=1-s2.0-S2666950124001275-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141845459","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":"Analysis and design of 25.3% efficient Sb2Se3 solar cells by numerical simulation","authors":"Xinyi Huang ,&nbsp;Yangang Zhang ,&nbsp;Long Fang ,&nbsp;Xiaolong Zhou ,&nbsp;Qiang Yu ,&nbsp;Keqilao Meng","doi":"10.1016/j.rio.2024.100734","DOIUrl":"10.1016/j.rio.2024.100734","url":null,"abstract":"<div><p>Sb₂Se₃ has a high absorption coefficient of 10⁵ cm⁻¹ in the visible light range, which is an excellent absorber layer material. Currently, a better band alignment between conventional CdS and Sb₂Se₃ has led to the widespread adoption of CdS as the electron transport layer (ETL) in Sb₂Se₃ solar cells. However, CdS is toxic, necessitating the exploration of alternative ETL materials that are eco-friendly and possess an appropriate energy band with Sb₂Se₃. In this study, we endeavor to pioneer an all-inorganic, green solar cell structure of Au/MoS₂/Sb₂Se₃/WS₂/ITO by employing MoS₂ as the hole transport layer (HTL) and WS₂ as the ETL. We primarily optimized Sb₂Se₃ thickness and its hole doping concentration (N_A) by SCAPS-1D numerical simulation. Based on the analysis of built-in electric field and carrier recombination rate along Sb₂Se₃, the optimal thickness and N_A ranges of Sb₂Se₃ are determined, which are 0.9–1.1 μm and 10¹⁶-10¹⁸ cm⁻³ respectively. Through a series of optimization, the structure achieves the highest power conversion efficiency (PCE) of about 25.3 % in the current simulation of Sb₂Se₃ solar cells. After comparing the novel WS₂ ETL with the conventional CdS ETL, we find that WS₂ has a larger built-in potential (V_bi) and charge recombination resistance (R_rec). In addition, from the analysis of energy band structure, the spike-like band at Sb₂Se₃/WS₂ interface can effectively inhibit the carrier recombination, which makes the device obtain a larger open circuit voltage (V_OC) of 0.69 V. This study can provide theoretical reference for the development of non-toxic and efficient Sb₂Se₃ solar cells.</p></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"16 ","pages":"Article 100734"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124001317/pdfft?md5=f89c34a33d1fb44e1cc50f48ffdb0f24&pid=1-s2.0-S2666950124001317-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142075846","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":"Impacts of graphene quantum dots on the optical, electrical and thermal properties of the archetypal conducting polymer PEDOT:PSS","authors":"Minghua Kong ,&nbsp;Miquel Garriga ,&nbsp;Juan Sebastián Reparaz ,&nbsp;Maria Isabel Alonso","doi":"10.1016/j.rio.2024.100737","DOIUrl":"10.1016/j.rio.2024.100737","url":null,"abstract":"<div><p>We investigated the optical properties and thermal conductivity of blade-coated graphene quantum dots (GQDs)/PEDOT:PSS hybrid thin films by varying the content of GQDs. The optical properties were determined by spectroscopic ellipsometry in the range of 1.2–5.5 eV. Two dispersion models were used to analyze the optical properties of the films: the Bruggeman effective medium approximation (BEMA) for the hybrid films, and the Drude model combined with a Lorentzian oscillator for both the pure and the hybrid films, which provides insight into their electrical properties. As a novel finding, we observed that the optical anisotropy of PEDOT:PSS (Aldrich 483095) films is reduced after incorporating GQDs. Moreover, dedoping of the PEDOT chains is demonstrated upon increasing the content of GQDs within the hybrid films. Furthermore, the thermal conductivity shows a two-fold decrease as the GQDs fraction increases from 0 to 10 wt%. This result is understood considering that the GQDs act as local scattering centers, resulting in a decrease of the thermal conductivity.</p></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"16 ","pages":"Article 100737"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124001342/pdfft?md5=76c7e848260be884eb2776474d4fb3a6&pid=1-s2.0-S2666950124001342-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142096563","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":"A new quantum key distribution protocol to reduce afterpulse and dark counts effects","authors":"Mahdi Rahmanpour,&nbsp;Alireza Erfanian,&nbsp;Ahmad Afifi,&nbsp;Mahdi Khaje,&nbsp;Mohammad Hossein Fahimifar","doi":"10.1016/j.rio.2024.100718","DOIUrl":"https://doi.org/10.1016/j.rio.2024.100718","url":null,"abstract":"<div><p>The most important goal of quantum communication is to distribute the encryption key between the transmitter and the receiver. The optimal situation in Quantum Key Distribution (QKD) between transmitter and receiver is to increase the key distribution rate per second, increase the transmission distance, and reduce the error in key distribution. Several protocols used for QKD. The most important of QKD protocols is the BB84. One of the challenges leading to errors in quantum protocols is generating error pulses in single-photon detectors. These pulses caused by the inherent effects of quantum devices. They can cause wrong detection in the receiver. Many measures have been taken in the design and construction of single-photon detectors to reduce this error pulses, but it is not possible to eliminate all of them. Afterpulse and dark counts are two types of unwanted pulses that occur with single-photon detectors. In this paper, a new QKD protocol is proposed. It is an upgrade of the BB84 protocol and can reduce the effects of unwanted pulses such as afterpulse and dark counts in QKD avalanche detectors.</p></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"16 ","pages":"Article 100718"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124001159/pdfft?md5=2af2b22cbc800fc0a6a3a73640493dca&pid=1-s2.0-S2666950124001159-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141486456","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":"Generation of wavelength-switchable nanosecond mode-locked pulses in an Erbium/Ytterbium co-doped fiber laser cavity","authors":"Varsha,&nbsp;Gautam Das","doi":"10.1016/j.rio.2024.100723","DOIUrl":"https://doi.org/10.1016/j.rio.2024.100723","url":null,"abstract":"<div><p>This article experimentally demonstrates the generation of mode-locked (ML) pulses, which can operate either at 1568 nm or 1608 nm in an Erbium/Ytterbium co-doped fiber laser cavity (EYDF). The wavelength switching was achieved by adjusting the cavity loss. Depending on the cavity length and losses, the laser could operate in either mode-locked (ML) or Q-switched (QS) regimes. We explored the characteristics of the QS and ML pulses, based on the pump power, cavity length and loss. The laser produced stable QS pulses with a repetition rate of 22.73 kHz and a width of 12.2 μs at a pump power of 3.1 W at 1608 nm, for a 30 m long cavity. The laser produced 520 ns ML pulses at 1568 nm with a repetition rate of 877 kHz, average output power of 2.15 mW, and energy of 2.45 nJ with an additional single-mode fiber (SMF) length 200 m at the same pump power. The laser could switch to 1608 nm wavelength when the cavity losses were adjusted.</p></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"16 ","pages":"Article 100723"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124001202/pdfft?md5=289c0622cd79643b6f66f6a6481f8746&pid=1-s2.0-S2666950124001202-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539864","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":"Experimental investigation on a solar-powered oxy-hydrogen gas system for enhanced plastic pyrolysis","authors":"Saqlain Abbas ,&nbsp;Muhammad Hamza ,&nbsp;Komal Afzal ,&nbsp;Zulkarnain Abbas ,&nbsp;Waqas Tariq Toor ,&nbsp;Ahmad Ali ,&nbsp;Faiza Bibi ,&nbsp;Zaryab Basharat","doi":"10.1016/j.rio.2024.100736","DOIUrl":"10.1016/j.rio.2024.100736","url":null,"abstract":"<div><p>The escalating environmental concerns associated with plastic waste have intensified the search for sustainable waste management solutions. Plastic dispersion in the environment poses severe threats to ecosystems, human well-being, and agriculture. Consequently, addressing plastic pollution stands as a pressing ecological concern. In contrast, the adoption of sustainable solar energy is harnessed for the production of HHO (Oxy-Hydrogen) gas, offering a promising avenue for clean energy generation. Gas production is achieved through the process of electrolysis, utilizing solar panels as the primary energy source. To address storage challenges, a spiral pipe configuration is employed for the interim containment of the generated HHO gas. Given the highly flammable nature of HHO gas, stringent safety protocols are imperative throughout the production and storage phases. To ensure the safe handling of HHO gas, a sophisticated MQ-8 Sensor is employed for real-time leak detection within the gas containment system. This sensor plays a critical role in maintaining operational safety by promptly identifying and addressing any potential gas leaks that may arise within the tubing infrastructure. The HHO gas, generated through the electrolysis process, serves as the primary fuel for the pyrolysis of plastic. This optimization is crucial to maximize the efficiency of the pyrolysis process. As a result of the pyrolysis process, crude oil is produced as an intermediary product. This crude oil holds the potential for subsequent refinement, offering versatility for various applications and end uses. Hence, the integration of solar energy-driven HHO gas in the pyrolysis of plastic demonstrates a promising avenue for mitigating plastic waste and contributing to environmental cleanliness. The intricate technological aspects, ranging from gas production through electrolysis, leak detection, optimized combustion, to crude oil production and refinement, collectively establish a comprehensive framework for sustainable waste management and resource recovery.</p></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"16 ","pages":"Article 100736"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124001330/pdfft?md5=39cbcd76f4b1940b0485537d972a5699&pid=1-s2.0-S2666950124001330-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142129108","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":"Lightweight mini-endoscope for two color imaging of neural activities with large field of view","authors":"Loïc Tabourin ,&nbsp;Frédéric Bretzner ,&nbsp;Tigran Galstian","doi":"10.1016/j.rio.2024.100732","DOIUrl":"10.1016/j.rio.2024.100732","url":null,"abstract":"<div><p>We present the design and the experimental characterization of a miniature “portable” mini-endoscope with a large field-of-view (<span><math><mrow><mo>≈</mo><mn>360</mn><mspace></mspace><mi>r</mi><mi>m</mi><mi>m</mi><mi>u</mi><mi>m</mi></mrow></math></span>) that operates with two spectral bands adapted for mCherry (peak emission at 610 nm) and GCaMP6s (peak emission at 513 nm) fluorophores. The diameter of the implant is very small (0.5 mm), the total weight is 1.8 g, the size is <span><math><mrow><mn>10</mn><mo>×</mo><mn>12</mn><mo>×</mo><mn>21</mn><mspace></mspace><msup><mrow><mi>mm</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span>, and the lateral resolution of the device is <span><math><mrow><mo>≈</mo><mn>4</mn><mo>.</mo><mn>5</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>. This compact and lightweight system allows investigation of the neural activity of two different neuronal populations.</p></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"16 ","pages":"Article 100732"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124001299/pdfft?md5=dfd8bef8682797d20f316116ac4d415a&pid=1-s2.0-S2666950124001299-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141963344","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":"Stochastic modulation of the Montgomery’s rings to generate the self-imaging effect with revival features","authors":"I. Cázares-Aguilar ,&nbsp;J.C. Atenco ,&nbsp;P. Martínez-Vara ,&nbsp;F. Cubillos-Morales ,&nbsp;I. Julián-Macías ,&nbsp;G. Martínez-Niconoff","doi":"10.1016/j.rio.2024.100714","DOIUrl":"https://doi.org/10.1016/j.rio.2024.100714","url":null,"abstract":"<div><p>The synthesis of optical fields that follows a stochastic process and whose statistical mean values generate the self-imaging-revivals effect is analyzed. A sufficient condition for optical fields to exhibit the self-imaging effect occurs when the frequency representation is located on the Montgomery’s rings. The study is performed by implementing stationary random fluctuations on the Montgomery’s rings of additive and multiplicative types. The additive noise is of the stochastic radial walk type with zero mean. Multiplicative noise generates stochastic angular fluctuations in the rings and is implemented using the Karhunen–Loève theorem. The modal representation implicit in the theorem is obtained by interpreting the self-imaging planes as an optical cavity, assuring the statistical periodicity of the noise. A time consonance of the random fluctuations for each ring allows to determine the revivals period for the self-imaging optical fields. The model is corroborated by computer simulations.</p></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"16 ","pages":"Article 100714"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124001111/pdfft?md5=1ae0c5e011b65ff5eaa4c663d89eabdf&pid=1-s2.0-S2666950124001111-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141583213","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":"Design and characterization of an ultra-sensitive photonic crystal fiber-based sensor for precise detection of alcohols in the THz regime","authors":"Zahra Dashtban ,&nbsp;Shahrzad Ramtinfard ,&nbsp;Nasim Kakesh ,&nbsp;Hamed Saghaei","doi":"10.1016/j.rio.2024.100721","DOIUrl":"https://doi.org/10.1016/j.rio.2024.100721","url":null,"abstract":"<div><p>In an era where the precise detection of alcohols is increasingly vital across a broad spectrum of industries, from healthcare to petrochemicals, the introduction of an innovative, highly sensitive photonic crystal fiber-based sensor represents a significant advancement. This pioneering research unveils a sensor engineered explicitly for the accurate detection of ethanol, methanol, and propanol, operating within the terahertz (THz) frequency range. Utilizing the exceptional attributes of photonic crystals and incorporating Zeonex as a base material, the sensor achieves unparalleled sensitivity and minimal material loss, thereby establishing new benchmarks for alcohol detection technologies. Its distinctive design, featuring rectangular air holes and an asymmetrical structure, not only enhances birefringence but also amplifies its sensitivity, guaranteeing superior performance that outstrips existing methods. The sensor’s operational advantages include its ability to detect alcohol at extremely low concentrations, its high speed of detection, and its resistance to environmental factors such as temperature and humidity. Beyond simple alcohol detection, the sensor serves as a versatile instrument with the potential for widespread application in sectors that demand dependable and efficient detection mechanisms, highlighting its adaptability and the broad scope of its use. This article not only provides a detailed overview of the sensor’s technical specifications and operational advantages but also places it within the broader landscape of technological innovation, signaling the dawn of a new chapter in substance detection and analysis.</p></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"16 ","pages":"Article 100721"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666950124001184/pdfft?md5=46500859f4a8f58ba591ba283754f535&pid=1-s2.0-S2666950124001184-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141583212","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":"Editorial to the Special Issue “Nanophotonics and optical fibers: New avenues for sensing and active devices”","authors":"","doi":"10.1016/j.rio.2024.100669","DOIUrl":"10.1016/j.rio.2024.100669","url":null,"abstract":"","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"16 ","pages":"Article 100669"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266695012400066X/pdfft?md5=8875e785e9621831b2228a2746cfd770&pid=1-s2.0-S266695012400066X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140785258","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}