Results in Optics最新文献

{"title":"An efficient broadband metasurface design for smart health care and future communication applications","authors":"Abdulkadir Cildir ,&nbsp;Farooq A. Tahir ,&nbsp;Abdul Jabbar ,&nbsp;Adnan Zahid ,&nbsp;Masood ur Rehman ,&nbsp;Hasan Abbas ,&nbsp;Qammer H. Abbasi","doi":"10.1016/j.rio.2024.100772","DOIUrl":"10.1016/j.rio.2024.100772","url":null,"abstract":"<div><div>We propose a broadband metasurface consisting of a novel compact resonator to achieve linear polarization conversion in reflection mode. This compact resonator is designed on Roger 5880 substrate, measuring 1.575 mm in thickness, and possessing a loss tangent of 0.004. This structure is also upheld by a metal ground. The described unit cell effectively sends back incoming waves by converting 90⁰ across a wide range of frequencies. This unit cell presents an efficiency exceeding 90 % for polarization conversion in the following frequency regimes: 12.2–41.5 GHz for normal incident waves. At the same time, this design includes polarization conversion with 90 % efficiency in broadband from 12.5 GHz to 30.6 GHz for angularly polarized waves up to <span><math><mrow><msup><mrow><mn>30</mn></mrow><mn>0</mn></msup></mrow></math></span>. Behind this broadband polarization transformation lies the concept of surface current distribution and a high impedance surface. Given the broad-spectrum coverage and high-efficiency polarization conversion capabilities, our proposal holds significant potential for a wide range of applications.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"19 ","pages":"Article 100772"},"PeriodicalIF":0.0,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387592","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 SMS fiber structure for seismocardiography (SCG) monitoring","authors":"F.R. Agustiyanto ,&nbsp;A.M. Hatta ,&nbsp;D. Arifianto ,&nbsp;M. Radityo ,&nbsp;P.S. Maulana ,&nbsp;B.S. Pikir","doi":"10.1016/j.rio.2025.100791","DOIUrl":"10.1016/j.rio.2025.100791","url":null,"abstract":"<div><div>A singlemode-multimode-singlemode (SMS) fiber structure for seismocardiography (SCG) monitoring that utilizes a simple intensity-based interrogation system is proposed in this letter. The vibration response of the SMS fiber structure utilized as a sensor is investigated experimentally. It is found that a linear vibration response of the SMS fiber structure within a frequency range of 0–180 Hz can be utilized for SCG monitoring that requires a low-frequency range of 0–25 Hz. The measured optical power of the SMS fiber structure was processed using filtering leads to SCG signal. It is also found that the placement of the sensor in the chest can vary the SCG signal. The proposed SCG sensor offers a simple configuration and low cost compared to other fiber optic SCG sensors.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"19 ","pages":"Article 100791"},"PeriodicalIF":0.0,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349528","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":"Evaluation of photocatalytic efficiency and antimicrobial potency of ZnS nanoparticles synthesized by hydrothermal method","authors":"Sangram Keshari Sahu,&nbsp;Dojalisa Sahu","doi":"10.1016/j.rio.2025.100787","DOIUrl":"10.1016/j.rio.2025.100787","url":null,"abstract":"<div><div>In this study, we report the photocatalytic efficiency and antimicrobial potency of zinc sulfide (ZnS) nanoparticles synthesized through hydrothermal method. The ZnS nanoparticles were prepared under controlled conditions to achieve uniform size distribution and high purity. Characterization techniques, including X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier Transformed Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) were employed to analyze the structural, morphological, and optical properties of the synthesized nanoparticles. UV–Visible absorption measurement was conducted to estimate the band gap of the nanoparticles. The photocatalytic performance of ZnS nanoparticles was evaluated by degrading methylene blue (MB) and alizarin red (AR) dyes under UV light irradiation. The ZnS nanoparticles exhibited significant photocatalytic activity, achieving up to 82.12 % and 85.51 % of degradation of MB and AR respectively within 180 min. The kinetic study revealed that the degradation process follows a pseudo-first-order reaction. The enhanced photocatalytic performance is attributed to the high surface area and optimal band gap of the ZnS nanoparticles, facilitating efficient generation and separation of electron-hole pairs. The antimicrobial potency of ZnS is also highly appreciable as it showed significance in the inhibition of bacterial growth. This research work highlights the viability of ZnS nanoparticles synthesized by the hydrothermal method as an effective photocatalyst for environmental remediation. The present work also focuses on the exploration of the antimicrobial efficiency of ZnS systematically.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100787"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154278","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":"Device modelling and performance enhancement of FASnI3-based perovskite solar cell with diverse, compatible charge transport layers","authors":"Kavitha M.V. ,&nbsp;Sudheer Sebastian K.","doi":"10.1016/j.rio.2025.100783","DOIUrl":"10.1016/j.rio.2025.100783","url":null,"abstract":"<div><div>Formamidinium Tin Iodide HC(NH₂)₂SnI₃ is a promising toxic-free candidate as an absorber layer in perovskite solar cells. In this work, the device structure, glass substrate /FTO/TiO₂/FASnI₃ /Spiro-OMeTAD/Au is simulated using SCAPS 1D software, and the obtained results are compared with experimental values, for calibrating the software. The simulations are repeated with 11 different Electron Transport Layers (ETLs) − TiO₂, SnO₂, CdS, ZnSe, WS_2, CeOx, C₆₀, Cd_0.5Zn_0.5S, IGZO, Zn(O_0.3S_0.7), PCBM and 2 Hole Transport Layers (HTLs) −Spiro-OMeTAD, MEH-PPV, that provide compatible band offsets at the interface. Out of all the various combinations of HTL and ETL that were simulated, the combination of MEH-PPV and Cd_0.5Zn_0.5S possessed the highest power conversion efficiency of 2.55 %. So the structure, glass substrate/FTO/Cd_0.5Zn_0.5S/FASnI₃/MEH-PPV/Au is chosen for further optimization, and some of the cell parameters are varied, such as absorber doping density, absorber defect density and thickness, ETL thickness, ETL doping density, ETL electron affinity, HTL thickness, HTL doping density, HTL electron affinity, temperature and material work function, to study their impact on cell performance parameters. The final simulation with the modified parameters produced an enhanced performance with an open circuit voltage (V_oc) of 0.9450 V, Short circuit current density (J_sc) of 31.74mAcm⁻², fill factor (FF) of 81.13 %, and power conversion efficiency(ƞ) of 24.33 %. The simulation is performed again, with the optimized parameters for the inverted structure, which showed an improvement in the performance parameters except for the short circuit current density. For the inverted structure, the performance parameters are obtained as follows: open circuit voltage (V_oc) = 1.0496 V, short circuit current density (J_sc) = 29.91 mA/cm², fill factor (FF) = 84.84 %, and power conversion efficiency(ƞ) = 26.64 %. The study examines the performance of FASnI₃ and provides significant knowledge of the choices of ETL and HTL, that benefit the photovoltaic community.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100783"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154320","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 a daylighting system: A solar concentrator (a Fresnel lens) coupled to optical fibers","authors":"Youssef Khrissi,&nbsp;Amine Tilioua","doi":"10.1016/j.rio.2025.100785","DOIUrl":"10.1016/j.rio.2025.100785","url":null,"abstract":"<div><div>Morocco has demonstrated a strong commitment to transitioning from a fossil fuel-based economy to renewable energy sources, positioning energy efficiency as a critical pillar of this shift. This study presents the development of an innovative, cost-effective daylighting system using fiber optics. The system is based on a solar concentrator consisting of Fresnel lenses, a simple sun-tracking mechanism, and inexpensive polymethyl methacrylate (PMMA) optical fibers. Preliminary tests carried out at the Mechanics, Energy Efficiency and Renewable Energies Laboratory (L.M.3.E.R.), Faculty of Sciences and Techniques Errachidia, Morocco have shown that the system can provide sufficient lighting levels for office tasks in areas with predominantly clear skies. According to calculations, the intensity of solar radiation captured by the system can reach 666 W/m² at 3p.m. in July. Experimental results revealed that the system achieves 50 lx under clear skies, with fiber attenuation of 150 dB/km. To achieve these performance levels, the system requires 25 Fresnel lenses measuring 9 cm², and 75 optical fibers with a diameter of 3 mm and a length of 2 m. These findings demonstrate the system’s potential as an affordable and sustainable solution for daylighting applications, contributing to energy efficiency goals.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100785"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154324","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":"Investigation of the optical properties of Dy doped ZnO/PVA thin film: White light emission for LED application","authors":"Srimathi Krishnaswamy ,&nbsp;Yashpal ,&nbsp;Puspamitra Panigrahi ,&nbsp;Akshaya Panigrahi ,&nbsp;Ganapathi Subramanian Nagarajan","doi":"10.1016/j.rio.2025.100786","DOIUrl":"10.1016/j.rio.2025.100786","url":null,"abstract":"<div><div>Different concentration of Dysprosium (Dy)(0, 0.25, 0.5, 1, 2, 3 and 4 %) was doped in zinc oxide by solid-state sintering method and investigated the effect of different concentrations of Dysprosium on crystallite size, morphology and optical studies on ZnO. Spherical morphology with 90 nm was revealed by Scanning electron microscopy with a low bandgap (3.033 eV) and was noticed for the higher concentration of Dysprosium in ZnO lattice. Room temperature photoluminescence was investigated in detail. The different weight percentage of 4 % Dy doped ZnO was added in polyvinyl alcohol and a thin film was fabricated and the optical properties were investigated in detail. 2Dy-ZnOF exhibited higher transmittance (42 %) and a lower bandgap(3.18 eV) was noticed. The peaks at 482 nm and 492 nm correspond to the transition of ⁴F _9/2 to ⁶H _15/2 and ⁴F _9/2 to ⁶H _13/2 respectively. This transition is due to the magnetic dipole transition and electric dipole transition. Further, a weak emission at 651 nm is due to ⁴F _9/2 to ⁶H _11/2 transition. CIE color chromaticity revealed for flexible Dy doped ZnO/PVA thin film in the white light region. Hence it could be a potential candidate for White Light LEDs.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100786"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154359","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":"Low loss silicon nitride based multimode interference beam splitter in a near polarization insensitive regime","authors":"Sepehr Najafi,&nbsp;Mahdi Khaje,&nbsp;Abdollah Eslamimajd","doi":"10.1016/j.rio.2025.100782","DOIUrl":"10.1016/j.rio.2025.100782","url":null,"abstract":"<div><div>Design and simulation process for a multimode interference (MMI) device based on a silicon nitride platform presented. The objective is to achieve a low-loss MMI model as a beam splitter at 1550 nm wavelength. Additionally, the device should exhibit least sensitivity to polarization changes. Finite element method employed throughout simulations and optimizations. Following mode analysis and preliminary design, the device optimized by a tapering assisted structure to operate near a polarization insensitive regime (0.062 dB TE and 0.078 dB TM). The impact of wavelength variation and fabrication imperfections on the device’s performance also investigated. The optimized design shows stable performance, making it suitable for wideband communication and quantum optical integrated circuits.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100782"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154275","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 of an all-optical AND gate with optimized response-time and area via nanostructured metamaterial: Light–matter interaction analysis","authors":"Nitish Kumar ,&nbsp;Mohd Mansoor Khan ,&nbsp;Ramesh Kumar Sonkar","doi":"10.1016/j.rio.2024.100766","DOIUrl":"10.1016/j.rio.2024.100766","url":null,"abstract":"<div><div>The work presents the design and performance evaluation of an all-optical AND logic gate exploiting the light beam interference effect. It showcases a novel configuration of oriented air-holes meticulously drilled into a silicon substrate, forming an easy-to-fabricate two-dimensional photonic crystal (2D-PC) arrangement. The comprehensive examination of the proposed gate has been carried out using the finite-difference time-domain (FDTD) method. Results demonstrate the gate’s capability to accurately satisfy its truth tables at a calculated wavelength of 1550 nm, which is imperative for C-band fiber-optic communication systems. The device’s structure boasts a unique 60-degree bend geometry to obtain a compact structure with minimum device area of <span><math><mrow><mn>40</mn><mo>.</mo><mn>8</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>² and a substantially high contrast ratio (CR) of 8.15. The response time of 0.12 ps is the lowest among the state-of-the-art 2D-PC AND gates, as per the authors’ knowledge.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100766"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154276","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 SIC and ML approach for MIMO non-orthogonal multiple access signal detection","authors":"Arun Kumar ,&nbsp;Nishant Gaur ,&nbsp;Aziz Nanthaamornphong","doi":"10.1016/j.rio.2025.100792","DOIUrl":"10.1016/j.rio.2025.100792","url":null,"abstract":"<div><div>One of the top candidates for an enhanced radio architecture is Optical Non-Orthogonal Multiple Access (O-NOMA), which is based on Multiple inputs and Multiple Outputs (MIMO). The identification of signals at the receiver terminal is more difficult due to the employment of a lot of antennas. For the identification of signals in the 8 × 8, 16 × 16, 64 × 64 and 256 × 256 O-NOMA frameworks, we provide a Maximum Likelihood (ML) and Successive Interference cancellation (SIC) method in this paper. Additionally, the suggested algorithms are compared with traditional ML, SIC, Zero Forcing (ZF), and Minimum Mean Square Error (MMSE) approaches, and rigorous estimations are made of metrics like Bit Error Rate (BER) and Power Spectral Density (PSD). The outcomes of the simulation show that the suggested SIC and ML outperform the traditional methods. It should be added that the 64 × 64 O-NOMA effectively increased the structure’s throughput and spectral efficiency.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100792"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154363","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":"Study of high-accuracy optical model of green phosphor pumped by ultraviolet laser","authors":"Huynh-Tuan- Anh Nguyen,&nbsp;Quang-Khoi Nguyen","doi":"10.1016/j.rio.2025.100780","DOIUrl":"10.1016/j.rio.2025.100780","url":null,"abstract":"<div><div>We have developed an optical model for<!--> <!-->green phosphor pumped by<!--> <!-->ultraviolet (UV) laser.<!--> <!-->The model<!--> <!-->has begun with<!--> <!-->defining an efficient mathematical<!--> <!-->model to describe the emission of UV band and green light. Next, the data<!--> <!-->of peak emission wavelength, the width of<!--> <!-->the<!--> <!-->emission band, and emission wavelength range are extracted from the measurement<!--> <!-->of<!--> <!-->the emission<!--> <!-->spectrum of green phosphor pumped by<!--> <!-->UV-laser. These parameters are put in the mathematical model to simulate the emission spectrum of<!--> <!-->green phosphor pumped by<!--> <!-->UV laser.<!--> <!-->Finally, the optical model is verified with experiment measurement. A comparison process of simulation and experiment for the emission spectrum of UV light and green light have been conducted to roughly define the value of beta which shows the high overlap level between simulation to experimental spectra for the case spectra for UV and green bands, correspondingly. Next, the obtained result is applied in the optimized process to define the optimal beta value. The similarity of simulation and experiment is<!--> <!-->quantified<!--> <!-->using a normalized<!--> <!-->cross-correlation<!--> <!-->algorithm. The optimal values for the beta of 3.5 and 3.0 for UV and green bands, respectively. The developed model is applied to study the effect of green light on the optical properties of the output spectrum wherein different green/UV light power ratios of 1.0, 1.2, 1.4, 1.5, 1.6, 1.8, and 2.0, respectively. The output luminous flux is proportional to the power ratio of green/UV.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"18 ","pages":"Article 100780"},"PeriodicalIF":0.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143154318","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}