Applied optics最新文献_第10页

SGLE-Net: polarization-aware enhancement in low light via an intensity-Stokes domain information fusion network. SGLE-Net：基于强度- stokes域信息融合网络的弱光偏振感知增强。

Applied optics Pub Date : 2025-07-10 DOI: 10.1364/AO.560606

Zhixin Dong, Xiangyue Zhang, Junlin Li, Yubo Zheng, Xiaosheng Yu, Chengdong Wu

{"title":"SGLE-Net: polarization-aware enhancement in low light via an intensity-Stokes domain information fusion network.","authors":"Zhixin Dong, Xiangyue Zhang, Junlin Li, Yubo Zheng, Xiaosheng Yu, Chengdong Wu","doi":"10.1364/AO.560606","DOIUrl":"https://doi.org/10.1364/AO.560606","url":null,"abstract":"In low-light conditions, polarization camera imaging quality deteriorates, compromising both light intensity capture and polarization information extraction, such as the degree of polarization (DoP) and angle of polarization (AoP). Unlike RGB images, polarized images contain additional physical information, making general enhancement methods unsuitable. To address this, we propose SGLE-Net, a Stokes-guided enhancement network specialized for low-light polarized images, leveraging both intensity-domain and polarization-domain information during enhancement. It consists of two sub-networks: (1) the intensity-enhanced network, which initially enhances brightness for global feature improvement, and (2) the polar-merged network, which fuses intensity and polarization domain information for comprehensive enhancement. To guide intensity-Stokes feature fusion, we introduce a Stokes-based fusion-enhanced module, leveraging complete intensity information and edge details less affected by environmental noise. Additionally, we design a polar-joint objective function combining intensity loss and polarization loss to balance the network's focus on total intensity and polarization information during training. Evaluated on two state-of-the-art low-light polarized datasets, SGLE-Net outperforms previous methods, effectively enhancing total intensity and producing higher-quality DoP and AoP.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 20","pages":"5632-5641"},"PeriodicalIF":0.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144824103","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

Erbium-doped fiber cascaded coreless fiber temperature and curvature sensor based on MZI. 基于MZI的掺铒光纤级联无芯光纤温度曲率传感器。

Applied optics Pub Date : 2025-07-10 DOI: 10.1364/AO.565441

Xiaoxiao Wei, Miao Fan, Jintao Chen, Hao Zhang

引用次数: 0

Automatically constructing an initial structure of athermal and achromatic optical systems based on particle swarm optimization. 基于粒子群优化的无热消色差光学系统初始结构的自动构造。

Applied optics Pub Date : 2025-07-10 DOI: 10.1364/AO.563922

Xingyan Wang, Hu Wang, Yaoke Xue, Zhanpeng Ma, Yang Shen, Wanrong Yu

引用次数: 0

Controlling the movement of nanoparticles in a dielectric metasurface by using rotatable linearly polarized light. 利用可旋转线偏振光控制电介质超表面中纳米粒子的运动。

Applied optics Pub Date : 2025-07-10 DOI: 10.1364/AO.566942

Shunru Bai, Huaixi Chen, Xinbin Zhang, Kun-Ching Shen, Yingyan Lin, Kun Chen, Yong Zhang, Huiyao Qin, Chenlu Zhang, Xinkai Feng, Xiaofu Xu

{"title":"Controlling the movement of nanoparticles in a dielectric metasurface by using rotatable linearly polarized light.","authors":"Shunru Bai, Huaixi Chen, Xinbin Zhang, Kun-Ching Shen, Yingyan Lin, Kun Chen, Yong Zhang, Huiyao Qin, Chenlu Zhang, Xinkai Feng, Xiaofu Xu","doi":"10.1364/AO.566942","DOIUrl":"https://doi.org/10.1364/AO.566942","url":null,"abstract":"We propose a nanoparticle transportation method in a dielectric metasurface for nanoparticles of particular sizes using rotatable linearly polarized light. The dielectric metasurface utilizes plum-blossom structures to realize hot spot position switching by rotating the polarization state of incident light. The convex point of the plum-blossom dielectric metasurface always has a hot spot with higher intensity than that in the concave point, and there is an unbalanced potential well between the two adjacent plum-blossom dielectric metasurface units so that the nanoparticles are more easily attracted and transferred to the adjacent unit with a deeper potential well. By cascading many single plum-blossom dielectric metasurface units into an array, the array forms a one-way multichannel optical control dielectric metasurface conveyor belt, which can realize nanoparticle capture and transmission. It can deliver the nanoparticles along the designated route in a dielectric metasurface. The design has great potential for optical flow control chips, which can achieve more stable nanoparticle transport through the action of rotating linearly polarized light.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 20","pages":"5742-5747"},"PeriodicalIF":0.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144824078","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

Multiresponse reconfigurable free-standing cascaded plasmonic grating with strong unidirectional guiding properties. 具有强单向导向特性的多响应可重构独立级联等离子体光栅。

Applied optics Pub Date : 2025-07-10 DOI: 10.1364/AO.560945

Agata Roszkiewicz

引用次数: 0

High-speed polarization imaging for in situ quality assessment in the fiber spinning process. 高速偏振成像用于纤维纺丝过程的现场质量评价。

Applied optics Pub Date : 2025-07-10 DOI: 10.1364/AO.550940

Anastasia Timofeeva, Mark Pankow, Kara Peters

引用次数: 0

High-temperature-resistant gas pressure sensor based on an all-silica Fabry-Perot interferometer. 基于全硅法布里-珀罗干涉仪的耐高温气体压力传感器。

Applied optics Pub Date : 2025-07-10 DOI: 10.1364/AO.565014

Yiming Zhu, Jiameng Zhou, Tao Jin, Xiao Wu, Mengshi Zhu, Liang Zhang, Fufei Pang, Dengwei Zhang, Heming Wei, Shijie Zheng, Carlos Marques

引用次数: 0

Reducing the afterpulse effect in QKD systems using detector doubling in the BB84 protocol. 在BB84协议中使用检测器加倍减少QKD系统中的后脉冲效应。

Applied optics Pub Date : 2025-07-10 DOI: 10.1364/AO.557367

Mahdi Rahmanpour, Alireza Erfanian, Ahmad Afifi, Mahdi Khaje, Mohammad Hossein Fahimifar

{"title":"Reducing the afterpulse effect in QKD systems using detector doubling in the BB84 protocol.","authors":"Mahdi Rahmanpour, Alireza Erfanian, Ahmad Afifi, Mahdi Khaje, Mohammad Hossein Fahimifar","doi":"10.1364/AO.557367","DOIUrl":"https://doi.org/10.1364/AO.557367","url":null,"abstract":"The afterpulse effect is an undesirable phenomenon that occurs in single-photon avalanche diodes (SPADs). SPADs are widely employed in quantum key distribution (QKD) systems. As QKD systems advance to support higher data rates, the minimization of afterpulses becomes increasingly critical. In this paper, we introduce what we believe to be a new structure for the BB84 QKD protocol to reduce afterpulses in QKD systems. The proposed method does not change the secure key rate compared to the conventional BB84 protocol. We conduct a theoretical analysis and simulation of the performance of a single-photon-based QKD system utilizing SPADs with suboptimal afterpulse characteristics. Our results indicate that the afterpulse probability (Pa) in SPADs does not impose a strict lower bound on the error rate of sifted keys in single-photon-based QKD systems. The system utilizes a simplified version of the two-bases BB84 protocol, which operates over fiber-optic or free-space channels. In the proposed structure, eight detectors are used to measure four polarization angles, yielding four possible outcomes. The findings emphasize the practicality of this setup for both fiber-based and free-space quantum communication, making it highly suitable for real-world applications. The afterpulse decay is dependent on an exponential function and changes proportionally to the elapsed time, the number of trapped carriers, the carrier lifetime, the field strength, and the temperature. The project team has extensive experience in afterpulse reduction and has published several papers on the subject. Using the idea presented in this paper, by doubling the receiver detectors under the same conditions, the probability of afterpulse occurrence is approximately halved. We are looking to propose new structures and protocols to reduce undesired pulses in single-photon avalanche detectors.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 20","pages":"5860-5866"},"PeriodicalIF":0.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144824102","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

Phase-controlled direction-tunable coupling of surface plasmon polaritons based on a plasmonic waveguide array. 基于等离子体波导阵列的表面等离子体激元相位控制方向可调耦合。

Applied optics Pub Date : 2025-07-10 DOI: 10.1364/AO.561369

Yinxing Ding

{"title":"Phase-controlled direction-tunable coupling of surface plasmon polaritons based on a plasmonic waveguide array.","authors":"Yinxing Ding","doi":"10.1364/AO.561369","DOIUrl":"https://doi.org/10.1364/AO.561369","url":null,"abstract":"A phase-controlled direction-tunable surface plasmon polariton (SPP) coupler is designed based on a plasmonic phased array (PPA) served by equally spaced stripe waveguides. It can couple phased SPPs fed through the PPA into the integrated plasmonic slab waveguide as directional SPPs, and the output SPPs can be steered by tuning the excitation phases. Theoretical investigations about a 7-element-PPA-based SPP coupler based on the finite-difference time-domain method indicate that the output SPPs can be dynamically steered over a range of up to 59.5°. Moreover, increasing the element number of the PPA can extend the steering range and narrow the main lobe. The pattern multiplication principle is employed to analyze the tunable properties of the coupler, and the results are consistent with the simulations, which not only verifies the correctness of the simulations but also deepens the understanding of the physical mechanism of the steerable beam. Effects of the change of the environment on the SPP coupler were investigated as well to give guidance for future device design. Such a phase-controlled direction-tunable SPP coupler should have potential applications in nano-optics and integrated optics due to its ability to steer the direction without mechanical motion.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 20","pages":"5796-5803"},"PeriodicalIF":0.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144824098","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

Real-time optical imaging acquisition and processing in Python: a practical guide using CAS. Python中的实时光学成像采集和处理：使用CAS的实用指南。

Applied optics Pub Date : 2025-07-10 DOI: 10.1364/AO.564458

Michael R Hughes

引用次数: 0