Optics express最新文献_第3页

Research on wireless channel model based on improved ray tracing algorithm that considers multiple diffuse scattering and employs pyramid-shaped ray tubes as the carrier. 基于改进的射线追踪算法的无线信道模型研究，该算法考虑了多重漫散射，并采用金字塔形射线管作为载体。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.533655

Qi Yao, Zhongyu Liu, Lixin Guo, Yuanxi Wang, Lantu Guo, Jun Zhao, Weiqing Zuo

{"title":"Research on wireless channel model based on improved ray tracing algorithm that considers multiple diffuse scattering and employs pyramid-shaped ray tubes as the carrier.","authors":"Qi Yao, Zhongyu Liu, Lixin Guo, Yuanxi Wang, Lantu Guo, Jun Zhao, Weiqing Zuo","doi":"10.1364/OE.533655","DOIUrl":"https://doi.org/10.1364/OE.533655","url":null,"abstract":"This paper extensively utilizes fine three dimensional environmental data obtained from laser point clouds. Based on theories such as geometrical optics and effective roughness theory, a deterministic wireless channel model is established, which integrates higher-order diffuse scattering. This model is referred to as the ray tracing fusion with higher-order diffuse scattering model. To expedite the collision calculation between rays and the scene, this paper introduces a combined approach of voxelization and signed distance field, resulting in a remarkable 16-fold improvement in computational speed. Moreover, aiming to balance accuracy and efficiency, the paper systematically analyzes the optimization computation parameters of the model. Finally, the proposed model is validated using measurement data in the frequency range of 1 GHz to 6 GHz in mountainous terrain. The results indicate that the predicted outcomes of the proposed model have an accuracy within 6 dB compared to the measurement results, and are superior to ITU-R P.1546, which is an international standard recommended by the International Telecommunication Union for modeling electromagnetic wave propagation in undulating terrain. This provides necessary technical support for network planning and optimization.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"41069-41088"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142688381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Plug-and-play adaptive optics microscopy with full-field correction using isoplanatic patch estimation and field segmentation. 即插即用自适应光学显微镜，利用等平面斑块估算和场分割进行全场校正。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.533494

Alex Dorn, Hans Zappe, Çağlar Ataman

{"title":"Plug-and-play adaptive optics microscopy with full-field correction using isoplanatic patch estimation and field segmentation.","authors":"Alex Dorn, Hans Zappe, Çağlar Ataman","doi":"10.1364/OE.533494","DOIUrl":"https://doi.org/10.1364/OE.533494","url":null,"abstract":"We discuss the implementation and performance of a plug-play adaptive optics (AO) module for commercial microscopes comprising indirect wavefront sensing, and a deformable phase plate (DPP) located directly between the objective and the turret. With the DPP at this location, the system closely resembles a pupil-AO scheme, in which effective aberration correction is only possible within the isoplanatic patch. We overcome this limitation by estimating the aberration profiles at multiple field points in parallel and correcting them in sequence to obtain a 2D array of high-quality sub-aperture images. These are then stitched together to form a corrected full-field image. To minimize the measurement time without compromising correction quality, we propose an empirical method to identify the size of the isoplanatic patch, which is both sample and system dependent. Matching the field segment size to that of the isoplanatic patch provides the best compromise between consistent correction quality across the image and measurement time. We demonstrate the performance of the developed system in a commercial microscope using synthetic samples and discuss the performance and limitations of the system.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"41764-41775"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142688345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Benefits of front coating crystalline scintillator screens for phase-contrast synchrotron micro-tomography. 用于相位对比同步加速器显微层析成像的前涂层晶体闪烁屏的优点。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.534383

Matthias Diez, Nasila Saeidnezhad, Paul Tafforeau, Simon Zabler

{"title":"Benefits of front coating crystalline scintillator screens for phase-contrast synchrotron micro-tomography.","authors":"Matthias Diez, Nasila Saeidnezhad, Paul Tafforeau, Simon Zabler","doi":"10.1364/OE.534383","DOIUrl":"https://doi.org/10.1364/OE.534383","url":null,"abstract":"Transparent crystalline scintillators such as cerium-doped YAG or LuAG are widely used in X-ray imaging for the indirect detection of X-rays. The application of reflective coatings on the front side to improve the optical gain is common practice for flat panel detectors with CsI or Gd2O2S powder scintillators but still largely unknown for crystalline scintillators such as LuAG. This work shows experimentally and quantitatively how a black and reflective coating on the X-ray side of a 2 mm LuAG:Ce scintillator improves the image quality compared to a 2 mm LuAG:Ce scintillator without a coating. The measurements have been done for two different distances, with 2 m and 29.7 m on the BM18 beamline of the European Synchrotron. The Modulation Transfer Function (MTF) and the Signal-to-Noise-Ratio (SNR2) power spectrum as well as contrast-to-noise ratio are used for comparing image quality. Propagation-based phase contrast strongly enhances the SNR2 amplitudes (gain ≈10 from 2 m to 29.7 m object-detector distance) of the raw images' spectrum independent of the scintillator coating. For both detector positions, the reflective coating is able to raise SNR2 by up to 80% through the improved optical gain, while black coating does the opposite (decrease SNR2 by 20%) with respect to no coating. With the tested optical setups, changes in MTF /sharpness between the coatings are minor. Comparing CNR2 in CT scans of a multi-material sample, in this case an electric motor, we observe the reflective coating yielding better material contrast for plastic and air. Application and effect of Wiener-deconvolution, along with Paganin-type phase retrieval, are also discussed in the context of CT image quality.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"41790-41803"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142687575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Liquid crystal-based polarization-dependent, electrically tunable beam deflectors formed via single-step photopolymerization-induced phase separation. 通过单步光聚合诱导相分离形成的基于液晶的偏振依赖性电可调光束偏转器。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.541181

Wenfeng Cai, Silin Yuan, Ming Cheng, Delai Kong, Ting Zhao, Zongjun Ma, Ziyan Bai, Mengjia Cen, Dan Luo, Yan Jun Liu

引用次数: 0

Picometer-scale OAM interferometry using an adaptive polar transform algorithm. 使用自适应极坐标变换算法的微米级 OAM 干涉测量。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.539096

Lanlin Ni, Haojie Xia, FeiFan Xu, Qiang Wu, Jin Zhang, Songtao Chang

引用次数: 0

Two-step Fourier single-pixel imaging for secure and efficient hidden information transmission. 两步傅立叶单像素成像，实现安全高效的隐藏信息传输。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.541427

Zihao Wang, Yongan Wen, Yu Ma, Yilin Tian, Yanzhao Cui, Wei Peng, Feifei Wang, Yang Lu

{"title":"Two-step Fourier single-pixel imaging for secure and efficient hidden information transmission.","authors":"Zihao Wang, Yongan Wen, Yu Ma, Yilin Tian, Yanzhao Cui, Wei Peng, Feifei Wang, Yang Lu","doi":"10.1364/OE.541427","DOIUrl":"https://doi.org/10.1364/OE.541427","url":null,"abstract":"In the rapidly evolving field of optical information security, single-pixel imaging (SPI) has emerged as a promising technique for hidden information transmission. However, traditional SPI methods face significant challenges, including the need for excessive modulation patterns and the vulnerability of encrypted information during transmission. Furthermore, the field lacks efficient methods to reconstruct both plaintext and ciphertext images from the same set of single-pixel measurements. Here, we propose a novel and efficient encryption strategy for Fourier single-pixel imaging (FSPI) that addresses these critical challenges. Our approach integrates two key innovations: a two-step Fourier-total variation conjugate gradient descent (F-TVCGD) method and a dual-key decryption mechanism. The F-TVCGD method significantly reduces the number of modulation patterns required for image reconstruction, enhancing efficiency and minimizing data redundancy. Our dual-key mechanism enables the reconstruction of both plaintext and ciphertext images from a single set of single-pixel measurements using different decryption keys, significantly enhancing security without compromising efficiency. The incorporation of Fourier symmetric patterns improves the convergence robustness of the symmetric gradient descent (SGD) algorithm, leading to superior performance under challenging conditions such as sparse sampling and noise attacks. Numerical simulations and optical experiments validate our method's improvements in both accuracy and security compared to traditional approaches. Our findings demonstrate that the proposed F-TVCGD and SGD strategies effectively address the challenges of excessive modulation patterns and information vulnerability in FSPI.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"41255-41269"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142687988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance evaluation of a two-stage few-mode EDFA for high-capacity SDM systems. 用于大容量 SDM 系统的两级少模 EDFA 性能评估。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.539087

Astrid Lozada, Ricardo Olivares, Nicolás Jara, Patricia Morales, Bárbara Dumas Feris, Ariel Leiva, Gabriel Saavedra, Danilo Bórquez-Paredes

引用次数: 0

Modal phase-matching in thin-film lithium niobate waveguides for efficient generation of entangled photon pairs. 铌酸锂薄膜波导中的模态相位匹配，用于高效生成纠缠光子对。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.539105

Jiacheng Liu, Jiachen Duan, Pingyu Zhu, Gongyu Xia, Qilin Hong, Kaikai Zhang, Zhihong Zhu, Shiqiao Qin, Ping Xu

{"title":"Modal phase-matching in thin-film lithium niobate waveguides for efficient generation of entangled photon pairs.","authors":"Jiacheng Liu, Jiachen Duan, Pingyu Zhu, Gongyu Xia, Qilin Hong, Kaikai Zhang, Zhihong Zhu, Shiqiao Qin, Ping Xu","doi":"10.1364/OE.539105","DOIUrl":"https://doi.org/10.1364/OE.539105","url":null,"abstract":"Thin-film lithium niobate (TFLN) waveguides have emerged as a pivotal platform for on-chip spontaneous parametric down-conversion (SPDC), serving as a crucible for the generation of entangled photon pairs. The periodic poling of TFLN, while capable of generating high-efficiency SPDC, demands intricate fabrication processes that can be onerous in terms of scalability and manufacturability. In this work, we introduce a novel approach to the generation of entangled photon pairs via SPDC within TFLN waveguides, harnessing the principles of modal phase-matching (MPM). To address the challenge of efficiently exciting pump light typically in a higher-order mode, we have engineered a mode converter that couples two asymmetrically dimensioned waveguides. This converter adeptly transforms the fundamental mode into a higher-order mode, demonstrating a conversion loss of 1.55 dB at 785 nm with a 3 dB bandwidth exceeding 30 nm. Subsequently, we have showcased the device's capabilities by characterizing the pair generation rate (PGR), coincidences-to-accidentals ratio (CAR), and spectral profile of the entangled photon source. Our findings present a simplified and versatile method for the on-chip generation of entangled photon sources, which may pave the way for the application in the realms of quantum information processing and communication technologies.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"40629-40639"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142687641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband 3-bit coding metasurface antenna with integrated radiation and scattering performance. 具有综合辐射和散射性能的宽带 3 位编码元面天线。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.542150

Junlin Wang, Xinyu Tong, Xin Wang, Yunsheng Guo, Xiaoyu Han, Saer A, Jun Wang

{"title":"Broadband 3-bit coding metasurface antenna with integrated radiation and scattering performance.","authors":"Junlin Wang, Xinyu Tong, Xin Wang, Yunsheng Guo, Xiaoyu Han, Saer A, Jun Wang","doi":"10.1364/OE.542150","DOIUrl":"https://doi.org/10.1364/OE.542150","url":null,"abstract":"This paper presents the design of an integrated metasurface antenna, which combines a central radiating patch with a quadru-arc (QAS) structure. The metasurface antenna simultaneously achieves high-gain radiation and complex scattering functionality. The modulation of the radiation function is primarily achieved through phase manipulation of the power division feed network, while modulation of the X-polarization scattering function is mainly accomplished by adjusting the arc of the QAS. The effectiveness of this design is verified by designing two metasurface antennas with distinct functionalities. The feed network phases are arranged in a checkerboard pattern in the first approach, resulting in four-beam radiation with a gain of 16 dBi per beam. Additionally, the scattering component utilizes eight scattering structures with a phase difference of 45 degrees to form a 3-bit coding, enabling vortex beam scattering. The second configuration arranges the feed network in phase with the deflected beam, resulting in a deflected beam radiation pattern characterized by a gain of 22.3 dBi. The scattering function is optimized using a simulated annealing-genetic algorithm for phase alignment, resulting in the achievement of RCS reduction across a wide bandwidth range of 8-24 GHz. The proposed metasurface antenna is ultimately fabricated and subjected to rigorous measurements.","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"40567-40580"},"PeriodicalIF":3.2,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142687643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

LIC-CGAN: fast lithography latent images calculation method for large-area masks using deep learning. LIC-CGAN：利用深度学习的大面积掩膜快速光刻潜影计算方法。

IF 3.2 2区物理与天体物理

Optics express Pub Date : 2024-11-04 DOI: 10.1364/OE.537921

Yihan Zhao, Lisong Dong, Ziqi Li, Yayi Wei

引用次数: 0