Results in Optics最新文献_第3页

Hybrid encryption approach utilizing OAM wavefronts and polarization sensitive metasurface 基于OAM波前和偏振敏感超表面的混合加密方法

IF 3

Results in Optics Pub Date : 2025-08-13 DOI: 10.1016/j.rio.2025.100881

Ali Mohammad Obaei , Amir Saman Nooramin, Mohammad Soleimani

{"title":"Hybrid encryption approach utilizing OAM wavefronts and polarization sensitive metasurface","authors":"Ali Mohammad Obaei , Amir Saman Nooramin, Mohammad Soleimani","doi":"10.1016/j.rio.2025.100881","DOIUrl":"10.1016/j.rio.2025.100881","url":null,"abstract":"<div><div>With the rapid advancements in quantum structures, reliance on traditional software-based encryption systems is no longer fully viable. In this context, it is essential to shift our perspective on encryption systems and adopt a hybrid approach combining software and hardware encryption to withstand new attacks characterized by high power and speed. To this end, we have designed a metasurface that can operate statically while employing a dynamic structure by engineering input polarization relative to output polarization. Specifically, when polarization x is incident on our structure, half of the power is converted to polarization y, which represents the cross-polarization, while the other half remains in the original polarization x, referred to as co-polarization. By appropriately arranging the unit cells in the co-polarization, we achieve a superposition of two modes L = −1, ＋1 for the OAM wavefront, while in the cross-polarization, we obtain a superposition of two modes L = −3, ＋3. The same conditions apply to polarization y, where in polarization x or cross, we have a superposition of two modes L = −3, ＋3, but in polarization y or co, the superposition yields two modes L = −2, ＋2. This metasurface is combined with software-based XOR encryption, complicating the task for unauthorized eavesdroppers.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100881"},"PeriodicalIF":3.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144867446","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

Three-dimensional profilometry based on two-step generalized phase shift for phase measurement of grating projections 基于两步广义相移的三维轮廓术用于光栅投影相位测量

IF 3

Results in Optics Pub Date : 2025-08-09 DOI: 10.1016/j.rio.2025.100884

Jiacheng Qi , Hongjin Qin , Ang Sun, Youpan Lai, Jie Li

引用次数: 0

Regression machine learning methods for isolation prediction and massive gain broadband MIMO antenna design for 28 GHz applications 用于隔离预测和28ghz应用的大增益宽带MIMO天线设计的回归机器学习方法

IF 3

Results in Optics Pub Date : 2025-08-09 DOI: 10.1016/j.rio.2025.100883

Md.Ashraful Haque , Redwan A. Ananta , Jun-Jiat Tiang , Mouaaz Nahas , Md Afzalur Rahman , Narinderjit Singh Sawaran Singh

{"title":"Regression machine learning methods for isolation prediction and massive gain broadband MIMO antenna design for 28 GHz applications","authors":"Md.Ashraful Haque , Redwan A. Ananta , Jun-Jiat Tiang , Mouaaz Nahas , Md Afzalur Rahman , Narinderjit Singh Sawaran Singh","doi":"10.1016/j.rio.2025.100883","DOIUrl":"10.1016/j.rio.2025.100883","url":null,"abstract":"<div><div>This research paper investigates the design and analysis of a miniaturized mm-Wave MIMO antenna array tailored for fifth-generation applications. The antenna demonstrates a calculated 10-dB impedance bandwidth of 16.61 % (27.137–31.788 GHz). To enhance performance, a combination of pi and L-shaped slots is employed. Constructed from low-loss dielectric material, specifically Rogers RT Druid 5880, the antenna features a dielectric constant of 2.2 and a tangent loss of 0.0009, with an ultrathin height of just 0.8 mm. The dimensions of both the substrate and ground for a single element are 0.653λ<sub>0</sub> × 0.653λ<sub>0</sub> mm, while the overall MIMO antenna design measures 2.8λ<sub>0</sub> × 2.8λ<sub>0</sub>, targeting the lowest frequency. In addition to its compact dimensions, the proposed design achieves a maximum gain of 9.129 dB, isolation greater than 26 dB, and an efficiency rating of 82.95 % at its optimal configuration. The Envelope Correlation Coefficient (ECC) is below 0.0012, and the Diversity Gain (DG) exceeds 9.99 dB. Various metrics are available to evaluate the performance of Machine Learning (ML) models, including variance score, R-squared, Mean Square Error (MSE), Mean Absolute Error (MAE), and Root Mean Square Error (RMSE). Among the five ML models assessed, Gaussian Process Regression (GPR) showcases the highest accuracy, exhibiting the lowest prediction error in isolation assessments. The results obtained from CST and ADS modeling, alongside actual and expected outcomes from machine learning, indicate that the proposed antenna is a strong candidate for 5Gapplications.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100883"},"PeriodicalIF":3.0,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144813845","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

High-efficiency lead-free all-perovskite tandem solar cells achieving 28.22 % power conversion efficiency: A Cs2AgBi0.75Sb0.25Br6/FASnI3 heterostructure design 实现28.22%功率转换效率的高效无铅全钙钛矿串联太阳能电池：Cs2AgBi0.75Sb0.25Br6/FASnI3异质结构设计

IF 3

Results in Optics Pub Date : 2025-08-09 DOI: 10.1016/j.rio.2025.100882

Sarowr Basm Almahsen, Ghaleb Ali Al-Dahash

{"title":"High-efficiency lead-free all-perovskite tandem solar cells achieving 28.22 % power conversion efficiency: A Cs2AgBi0.75Sb0.25Br6/FASnI3 heterostructure design","authors":"Sarowr Basm Almahsen, Ghaleb Ali Al-Dahash","doi":"10.1016/j.rio.2025.100882","DOIUrl":"10.1016/j.rio.2025.100882","url":null,"abstract":"<div><div>This research looks at how well an all-perovskite, lead-free tandem solar cell works. It has a wide-bandgap (1.8 eV) Cs<sub>2</sub>AgBi<sub>0</sub>.<sub>75</sub>Sb<sub>0</sub>.<sub>25</sub>Br<sub>6</sub> top subcell and a narrow-bandgap (1.41 eV) FASnI<sub>3</sub> bottom subcell. We show a very efficient device design by carefully adjusting the thicknesses of the absorber layers (600 nm for the top cell and 500 nm for the bottom cell) and the charge transport layers (TiO<sub>2</sub> as ETL and Cu<sub>2</sub>O as HTL). Numerical simulations using SCAPS-1D under AM1.5G light show that the best power conversion efficiency (PCE) achieved is 28.22 %, along with a very satisfactory fill factor (88.74 %), short-circuit current density (27.886 mA/cm<sup>2</sup>), and Open-circuit voltage (1.1402 V) at 300 K. The optimized structure (FTO/TiO<sub>2</sub>/Cs<sub>2</sub>AgBi<sub>0</sub>.<sub>75</sub>Sb<sub>0</sub>.<sub>25</sub>Br<sub>6</sub>/FASnI<sub>3</sub>/Cu<sub>2</sub>O) highlights the synergistic potential of these lead-free perovskites in tandem configurations. These results not only advance the development of environmentally friendly photovoltaics but also pave the way for scalable, high-performance tandem solar cells that rival their lead-based counterparts.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100882"},"PeriodicalIF":3.0,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144810559","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

Refractive index change in a double quantum dot structure 双量子点结构折射率的变化

IF 3

Results in Optics Pub Date : 2025-08-05 DOI: 10.1016/j.rio.2025.100880

Suha Hadi , Mohammed A.A. Abbas , Faten K. Hachim , Baqer Obaid Al-Nashy , Amin H. Al‑Khursan

引用次数: 0

Laser-induced florescence and absorption studies on some food colors and flavors by violet diode lasers 紫色二极管激光对某些食品色素和香精的激光诱导荧光和吸收研究

IF 3

Results in Optics Pub Date : 2025-08-05 DOI: 10.1016/j.rio.2025.100874

Kazi Monowar Abedin, Khadija Saleh Al Sawafi

引用次数: 0

Spectral filtering effect of diffraction gratings with a lens coupling to optical fibers 光纤耦合透镜衍射光栅的光谱滤波效应

IF 3

Results in Optics Pub Date : 2025-08-05 DOI: 10.1016/j.rio.2025.100875

Seonjong Ryu , Jinpyo Jeong , Mintae Kang , Taemin Son , Andy Chong

引用次数: 0

Wearable graphene-patterned gas detection sensor 可穿戴石墨烯图案气体检测传感器

IF 3

Results in Optics Pub Date : 2025-08-04 DOI: 10.1016/j.rio.2025.100876

Mohammadreza Nehzati , Alireza Barati Haghverdi , Amir Ali Mohammad Khani , Ilghar Rezaei , Toktam Aghaee

{"title":"Wearable graphene-patterned gas detection sensor","authors":"Mohammadreza Nehzati , Alireza Barati Haghverdi , Amir Ali Mohammad Khani , Ilghar Rezaei , Toktam Aghaee","doi":"10.1016/j.rio.2025.100876","DOIUrl":"10.1016/j.rio.2025.100876","url":null,"abstract":"<div><div>A wearable graphene-based bio-sensor is proposed in this work. The operational frequency range is the THz gap while the sensor includes a golden bottom, Kapton spacer, and periodic arrays of graphene disks and ribbons. The structure is exclusively represented by an impedance that can predict absorption versus frequency. Additionally, a parallel full wave simulation is performed to investigate the equivalent circuit model (ECM) validation. According to the reported simulation results, the proposed graphene-based sensor leverages both design methodology and sensible response to probable toxic gas existence. This stems from highly sensitive behavior against variations in the surrounding environment’s refractive index. The proposed graphene-based sensor is capable of showing perfect absorption peaks @ 2.5 THz, 5.5 THz, and 8.5 THz while each peak possesses 0.2 THz width. Ample results are provided to explore the sensor sensitivity against design parameters including the structure geometry, physical constants, and external stimulation. Additionally, carbon monoxide is considered to pollute the space with different concentrations. The sensor responses for this situation are investigated from 0 to 400 ppm and interpreted. It shows that a 100 ppm variation of carbon monoxide causes about a 1THz frequency shift. Such a highly sensitive optical sensor is in great demand for realizing healthcare monitoring systems.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100876"},"PeriodicalIF":3.0,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766605","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

Concurrent wireless power and information transfer with beamforming for 5G networks 5G网络波束成形并发无线供电和信息传输

IF 3

Results in Optics Pub Date : 2025-08-02 DOI: 10.1016/j.rio.2025.100878

Arun Kumar , Nishant Gaur , Sumit Chakravarty , Aziz Nanthaamornphong

{"title":"Concurrent wireless power and information transfer with beamforming for 5G networks","authors":"Arun Kumar , Nishant Gaur , Sumit Chakravarty , Aziz Nanthaamornphong","doi":"10.1016/j.rio.2025.100878","DOIUrl":"10.1016/j.rio.2025.100878","url":null,"abstract":"<div><div>In this study, we investigate a multiple-input single-output non-orthogonal multiple access (MISO-NOMA) system with simultaneous wireless information and power transfer (SWIPT). A base station (BS) equipped with multiple antennas transmits superimposed signals for information and energy via beamforming to multiple single-antenna users. These signals are decoded using successive interference cancellation (SIC). Each user receives a combination of desired signals, interference from higher-priority users, and additive noise, all of which affect performance. The signal-to-interference-plus-noise ratio (SINR) of each user is computed to determine the achievable rate using Shannon’s capacity formula. Additionally, users harvest energy from the received signals based on a specified energy conversion efficiency. To maximize the system’s sum rate, we propose a joint beamforming and power control optimization strategy, ensuring that each user meets a minimum energy harvesting requirement. The optimization is subject to a total transmit power constraint within the available budget. Simulation results using MATLAB confirm the effectiveness of the proposed scheme, demonstrating efficient power allocation, interference mitigation, and improved overall performance in NOMA-based SWIPT systems. Although the model is analyzed for a three-user scenario, the findings offer insights that can be generalized to systems with more users. This research provides a foundation for practical implementation and future enhancements in power distribution and spectral efficiency.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100878"},"PeriodicalIF":3.0,"publicationDate":"2025-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757322","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

Comparative analysis of different fiber types for strain sensing application under simulated mine conditions 不同类型光纤在模拟矿山条件下应变传感应用的比较分析

IF 3

Results in Optics Pub Date : 2025-08-02 DOI: 10.1016/j.rio.2025.100879

W.K. Nyarangi , E.K. Rotich Kipnoo , F.W. Masinde , D.W. Waswa , J. Jena

{"title":"Comparative analysis of different fiber types for strain sensing application under simulated mine conditions","authors":"W.K. Nyarangi , E.K. Rotich Kipnoo , F.W. Masinde , D.W. Waswa , J. Jena","doi":"10.1016/j.rio.2025.100879","DOIUrl":"10.1016/j.rio.2025.100879","url":null,"abstract":"<div><div>The recent advances in technology have provided deeper insights into hazard detection for mine safety. This study proposes an optical fiber sensor for mining applications. The performance of four fiber types—G652 Corning, G655 OFS, G655 Corning, and PMF Corning—was evaluated when subjected to controlled strain, simulating potential failure conditions. Additionally, the effectiveness of three laser sources—DFB, MZM, and WDM—was assessed to determine the most suitable laser for strain sensing. Constant input powers were used for strain measurements (<span><span>Fig. 2</span></span>), with the power recovering to approximately the same values after unloading (<span><span>Fig. 3</span></span>), confirming that no permanent deformation occurred in the fibers. In contrast, a fixed input power of 0.49 dBm was maintained across each of the three laser sources during performance evaluation (<span><span>Fig. 4</span></span>to ensure consistency in the comparisons. The optimal combination of the MZM laser source and G655 OFS fiber was found to be the best for mining applications. A strain sensitivity of 0.0041 dB/N and an SOP speed of 5.125 <sup>0</sup>/s is achieved. The data obtained from these experiments offer valuable insights into the behaviour of mine structures under stress and can contribute to the development of reliable early warning systems.</div></div>","PeriodicalId":21151,"journal":{"name":"Results in Optics","volume":"21 ","pages":"Article 100879"},"PeriodicalIF":3.0,"publicationDate":"2025-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144763590","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