Applied optics最新文献_第4页

Spectacle lens design with double aspheric surfaces using differentiable ray tracing. 利用可微光线追踪技术设计双非球面眼镜镜片。

Applied optics Pub Date : 2025-09-10 DOI: 10.1364/AO.569087

Xinghua Pan, Haisong Tang, ZeXin Feng, Huazhong Xiang

引用次数: 0

Missing region recovery for binocular point cloud using monocular-binocular fusion. 利用单双目融合恢复双目点云缺失区域。

Applied optics Pub Date : 2025-09-10 DOI: 10.1364/AO.563969

Tongxin Xu, Youqiang Dong, Bongrae Park, Thomas Koch, Zhibo Wan

引用次数: 0

Identifying and tracking method for the beacon in intersatellite laser communications based on the fractional Fourier transform. 基于分数阶傅里叶变换的星间激光通信信标识别与跟踪方法。

Applied optics Pub Date : 2025-09-10 DOI: 10.1364/AO.561411

Qiyun Liang, Ninghua Zhang, Qiang Wang, Xuewei Wang, Lei Cui

{"title":"Identifying and tracking method for the beacon in intersatellite laser communications based on the fractional Fourier transform.","authors":"Qiyun Liang, Ninghua Zhang, Qiang Wang, Xuewei Wang, Lei Cui","doi":"10.1364/AO.561411","DOIUrl":"https://doi.org/10.1364/AO.561411","url":null,"abstract":"In satellite-to-satellite optical communications, accurate beacon tracking necessitates two optical terminals. However, during tracking, star background light noise in the receiver's charge-coupled device field of view interferes with beacon light identification, impairing system performance and communication stability, and potentially disrupting the laser communication link. The fast Fourier transform (FFT) algorithm is typically used to differentiate the beacon from starlight based on frequency characteristics. Nonetheless, when the motion trajectories of the beacon and background lights are similar and their light spots overlap, FFT has difficulty distinguishing them, causing incorrect identification of the beacon light, and then disrupting the tracking process. We introduce the fractional Fourier transform segmentation approach, which represents signals in a fractional Fourier field by rotating any angle counterclockwise around the origin in the time-frequency plane, which isolates the beacon from the background light. The method enables effective separation of the beacon light from complex scenarios, so the tracking process will not be interrupted when background light interference occurs at the terminal. This method has great value for improving the tracking performance of laser communication on the beacon light.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 26","pages":"7636-7644"},"PeriodicalIF":0.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115780","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

Influence of the gradient distribution of VO₂ particles on the performance of thermochromic smart window films. VO2颗粒梯度分布对热致变色智能窗膜性能的影响。

Applied optics Pub Date : 2025-09-10 DOI: 10.1364/AO.572043

Kewei Sun, Yinmo Xie, Xiaoyue Zhang, Jun Qiu, Jianyu Tan

{"title":"Influence of the gradient distribution of VO2 particles on the performance of thermochromic smart window films.","authors":"Kewei Sun, Yinmo Xie, Xiaoyue Zhang, Jun Qiu, Jianyu Tan","doi":"10.1364/AO.572043","DOIUrl":"https://doi.org/10.1364/AO.572043","url":null,"abstract":"Smart windows play an important role in regulating solar radiation and reducing building energy consumption. Thermochromic smart windows based on VO2 nanoparticles offer great potential for large-scale applications. However, non-uniform distributions of particle size and volume fraction along the film thickness direction are often present in VO2 films, which not only affect optical modulation but also induce uneven local phase transitions, further impacting thermal regulation and response efficiency. In this study, a multiscale coupled model was developed using the finite-difference time-domain (FDTD) method and the finite element method (FEM) to investigate how these non-uniformities influence the optical and thermal behavior of VO2 nanoparticle films. When the particle size gradient increased from 30-40-50 to 30-50-100 nm, τlum dropped by 8.29% and Δτsol by 7.43%, with similar trends observed across different film thicknesses. In 15 µm films, the peak temperature of the film with a uniform particle size distribution is 2.31°C higher than that of the non-uniform film, which promotes more complete and more synchronous phase transition. The influence of non-uniform volume fraction on optical performance was limited, but its effect on local temperature response was pronounced. In 5 µm films, a downward-fv distribution increased the peak temperature by 0.75°C. When the particle size variation is within 10 nm, a uniform model remains effective; however, with larger gradients or thicker films, fine modeling is required to ensure predictive accuracy. Optimizing particle size and volume fraction distributions can improve the optical-thermal response of VO2 films and lower the required transition temperature.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 26","pages":"7724-7738"},"PeriodicalIF":0.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115822","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

Physics-informed neural networks for deterministic modeling of polarization division multiplexed fiber transmission systems. 基于物理信息的偏振分复用光纤传输系统确定性建模神经网络。

Applied optics Pub Date : 2025-09-10 DOI: 10.1364/AO.571796

Shihong Xu, Xinyi Xu, Run Zhou, Jiahao Zhang, Qun Zhang, Lu Zhang

引用次数: 0

Design of a mid-wave infrared computational microspectrometer based on a nanorod-dielectric metasurface. 基于纳米棒-介电超表面的中波红外计算微光谱仪设计。

Applied optics Pub Date : 2025-09-10 DOI: 10.1364/AO.567753

Wei Wu, Jing Zhu, Jianglin Chen, Yuting Zhang, Siqi Xu

引用次数: 0

Minimizing positioning error through strategic LED arrangement: circular layout superiority in ANN-based VLP. 策略性排列LED以减少定位误差：基于人工神经网络的VLP的圆形布局优势。

Applied optics Pub Date : 2025-09-10 DOI: 10.1364/AO.568213

Ajit Kumar, Nishant Sharan, Vipul Dixit, S K Ghorai, R Karibasappa, K P Ravikumar, Amresh Kumar

{"title":"Minimizing positioning error through strategic LED arrangement: circular layout superiority in ANN-based VLP.","authors":"Ajit Kumar, Nishant Sharan, Vipul Dixit, S K Ghorai, R Karibasappa, K P Ravikumar, Amresh Kumar","doi":"10.1364/AO.568213","DOIUrl":"https://doi.org/10.1364/AO.568213","url":null,"abstract":"This research introduces a fingerprint-based artificial neural network approach for visible light positioning systems. The study evaluates four different light emitting diode (LED) configurations-square, rectangular, triangular, and circular-within a 5m×5m×3m indoor environment to determine which arrangement delivers the highest positioning accuracy. The analysis employs a receiver moving in a circular path within the receiver plane for the estimation of positioning accuracy across the entire trajectory. Comprehensive simulation results, including the cumulative distribution function, frequency distribution of positioning errors, and error magnitudes at different receiver locations, demonstrate that the mean positioning errors (in centimeters) are 15.2893, 12.4548, 52.5016, and 9.8749 for square, rectangular, triangular, and circular configurations, respectively. The findings indicate that the circular arrangement yields superior performance with minimal positioning error. This configuration creates consistent signal strength gradients across all directions, eliminating potential \"dead zones\" and maximizing line-of-sight connections between LEDs and the receiver regardless of position. The superior performance of the circular configuration underscores the significant impact of geometric arrangement on positioning accuracy, even when utilizing identical numbers of LEDs and signal processing techniques.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 26","pages":"7755-7767"},"PeriodicalIF":0.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115860","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

VO₂-based reconfigurable metamaterial enabling switchable single-dual-band asymmetric transmission at terahertz frequencies. 基于vo2的可重构超材料，可在太赫兹频率下实现可切换的单-双波段不对称传输。

Applied optics Pub Date : 2025-09-10 DOI: 10.1364/AO.572124

Xianhua Yin, Junrong Su, Huo Zhang

{"title":"VO2-based reconfigurable metamaterial enabling switchable single-dual-band asymmetric transmission at terahertz frequencies.","authors":"Xianhua Yin, Junrong Su, Huo Zhang","doi":"10.1364/AO.572124","DOIUrl":"https://doi.org/10.1364/AO.572124","url":null,"abstract":"To address the challenge of dynamically controlling the operating bands of terahertz wave polarization conversion, we propose a tunable terahertz metamaterial device capable of switching its asymmetric transmission between single-band and dual-band modes. The device consists of a top layer of gold and vanadium dioxide, separated from the bottom layer by a polyimide spacer layer. The bottom layer is a mirror-symmetric and 90°-rotated configuration of the top structure. Leveraging vanadium dioxide's phase transition property from an insulating to a metallic state upon heating enables the tunability of incident terahertz waves. In the metallic state, the structure exhibits pronounced single-band asymmetric transmission, with a transmission coefficient Tyx reaching 0.85 at 1.54 THz, while Txy remains at 0.06. In the insulating state, dual-band asymmetric transmission is observed, with peak Tyx values of 0.786 at 1.45 THz and 0.783 at 2.0 THz, and corresponding Txy values of 0.06 and 0.07, respectively. Analysis of the structural surface currents reveals that the structure excites asymmetric dipole current resonance, which enables cross-coupling between the incident electric field and induced magnetic field, resulting in asymmetric transmission. The introduction of the coupled-mode theory abstracts the metamaterial as a coupled dual-resonator system, thereby providing further insights into the physical mechanism of dual-band polarization conversion. This tunable asymmetric transmission device presents a promising approach for expanding the applications of filters and tunable optoelectronic devices.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 26","pages":"7807-7816"},"PeriodicalIF":0.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115956","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

Analytic and numeric study of polarized light propagation in turbid media for lidar applications. 偏振光在混浊介质中传播的解析与数值研究。

Applied optics Pub Date : 2025-09-10 DOI: 10.1364/AO.568350

Manuel Petzi, André Liemert, Dominik Reitzle, Alwin Kienle

引用次数: 0

Yb,Tm:LiYF₄ lasers at 1.5 and 2.3 µm pumped by a Yb-fiber laser. Yb光纤激光器抽运1.5和2.3 μ m波长的Yb，Tm:LiYF4激光器。

Applied optics Pub Date : 2025-09-10 DOI: 10.1364/AO.573953

Ahmed Nady, Pavel Loiko, Abdelmjid Benayad, Alain Braud, Ammar Hideur, Patrice Camy

引用次数: 0