Optics Communications最新文献_第4页

Multi-exposure image fusion for phase enhancement in digital holographic microscopy 用于数字全息显微镜相位增强的多曝光图像融合

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-15 DOI: 10.1016/j.optcom.2024.131314

Bingcai Liu , Xueling Zhang , Linlin Huang , Xinmeng Fang , Shaoping Ma , Xueliang Zhu , Hongjun Wang , Ailing Tian

{"title":"Multi-exposure image fusion for phase enhancement in digital holographic microscopy","authors":"Bingcai Liu , Xueling Zhang , Linlin Huang , Xinmeng Fang , Shaoping Ma , Xueliang Zhu , Hongjun Wang , Ailing Tian","doi":"10.1016/j.optcom.2024.131314","DOIUrl":"10.1016/j.optcom.2024.131314","url":null,"abstract":"<div><div>Phase information in single exposure images is often lost for specimens with non-uniform transmittance. To address this issue, we propose a multi-exposure image fusion phase enhancement technique for holographic images. In this process, exposure time is varied to acquire 11 groups of four-step phase-shifted holographic images from a common sampling area. The resulting images are then decomposed using a wavelet transform. Maximum phase information from the low-frequency regions and regional features from the high-frequency regions were employed to avoid discontinuities in subsequent reconstructions, caused by regional truncation. Holographic images were then obtained after multi-exposure image fusion using a wavelet fusion method. Corresponding phase information was acquired by reconstructing fused holographic images using a four-step phase shifting technique. Experimental results showed that for specimens with non-uniform transmittance, this approach increased information entropy by 4.2%, edge density by 5%, and contrast by 3.8%, in comparison with the single-exposure digital holography phase reconstruction method. This result suggests that clarity and information content are improved, thereby enhancing the reconstructed phase.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131314"},"PeriodicalIF":2.2,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Ultraviolet thermally tunable silicon magnetic plasmon induced transparency 紫外热可调硅磁等离子体诱导透明度

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-15 DOI: 10.1016/j.optcom.2024.131312

Lili Yu , Fan Ji , Tian Guo , Zhendong Yan , Zhong Huang , Juan Deng , Chaojun Tang

{"title":"Ultraviolet thermally tunable silicon magnetic plasmon induced transparency","authors":"Lili Yu , Fan Ji , Tian Guo , Zhendong Yan , Zhong Huang , Juan Deng , Chaojun Tang","doi":"10.1016/j.optcom.2024.131312","DOIUrl":"10.1016/j.optcom.2024.131312","url":null,"abstract":"<div><div>Pushing a tunable metamaterial magnetic plasmon resonance with a narrow linewidth into the ultraviolet region still remains a challenge, which is desirable for the applications of optoelectronic devices in the ultraviolet (UV) range. Here, a thermally tunable narrow UV magnetic plasmon induced transparency (PIT) is explored in a metamaterial consisting of Si vertical split ring resonator (Si VSRRs) array. With the 3D metamaterials suspended in air to minimize the dielectric substrate effect, the plasmonic interference between the bright broad Si UV magnetic plasmon and the dark narrow Wood-Rayleigh anomaly mode produces a narrow PIT with a bandwidth of 5.2 nm and a Rabi splitting energy of 87 meV in the UV, revealed by the coupled Lorentz oscillator theory. Moreover, a dynamic tuning of the UV magnetic PIT and the associated slow light is achieved via temperature change of the encapsulated ethanol. With a high-level sensitivity of 180 nm/RIU and a figure of merit of 45, the lifted Si VSRR is applicable to detecting sub nanometre-thick analytes, indicating the potential for developing UV plasmonic biosensing.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131312"},"PeriodicalIF":2.2,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Enhanced transmitter designs for indoor MIMO-VLC systems 用于室内 MIMO-VLC 系统的增强型发射机设计

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-15 DOI: 10.1016/j.optcom.2024.131279

Yinan Zhao , Zhihong Zeng , Hailin Cao , Chen Chen

{"title":"Enhanced transmitter designs for indoor MIMO-VLC systems","authors":"Yinan Zhao , Zhihong Zeng , Hailin Cao , Chen Chen","doi":"10.1016/j.optcom.2024.131279","DOIUrl":"10.1016/j.optcom.2024.131279","url":null,"abstract":"<div><div>Multiple-input multiple-output (MIMO) technology, a fundamental element of 6G, has been widely implemented in visible light communication (VLC) systems. However, actual MIMO-VLC systems face significant challenges due to severe channel correlation. To tackle this issue, in this paper, we propose two enhanced transmitter designs for performance improvement of indoor MIMO-VLC systems, including single transmitter partial coverage (STPC) and enhanced STPC. For the STPC scheme, a single LED transmitter only needs to cover part of the receiving plane, instead of covering the whole receiving plane as in the conventional single transmitter full coverage (STFC) scheme. For the enhanced STPC scheme, each light-emitting diode (LED) is replaced with an LED subarray so as to further improve the system performance. Our simulation results reveal that the system performance is influenced by the LED array spacing, LED subarray spacing, and the LED semi-angle at half power. We identify the optimal combinations of these parameters to maximize the average achievable spectrum efficiency of the system. Notably, the STPC and Enhanced STPC schemes demonstrate increases in average achievable spectrum efficiency of 478.14% and 589.49%, respectively, compared to the benchmark STFC scheme.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131279"},"PeriodicalIF":2.2,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Iterative critical ray tracing for local tolerance analysis of freeform imaging systems 用于自由形态成像系统局部容差分析的迭代临界光线追踪技术

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-14 DOI: 10.1016/j.optcom.2024.131299

Rundong Fan , Shili Wei , Zhuang Qian , Huiru Ji , Hao Tan , Yan Mo , Le Yang , Donglin Ma

{"title":"Iterative critical ray tracing for local tolerance analysis of freeform imaging systems","authors":"Rundong Fan , Shili Wei , Zhuang Qian , Huiru Ji , Hao Tan , Yan Mo , Le Yang , Donglin Ma","doi":"10.1016/j.optcom.2024.131299","DOIUrl":"10.1016/j.optcom.2024.131299","url":null,"abstract":"<div><div>Tolerance analysis of the freeform surfaces serves as a critical bridge between design and manufacturing, offering essential guidance for the desensitization design of optical systems and playing a crucial role in the development of advanced imaging systems. Recently, Deng et al. proposed a direct method [Deng et al. Optica 9, 1039 (2022)] for solving tolerances of freeform surfaces, which reveals the local characteristics of the tolerances of freeform surfaces. However, the method requires dense sampling of the fields of view (FOVs) and the entrance pupil (EP) to cover as many optical surface points as possible, thereby achieving more accurate tolerance envelope solutions. Here, we propose an iterative algorithm called \"critical ray tracing\" to calculate the critical rays at points on the optical surface and utilize this information for surface tolerance analysis. This method involves fitting the coordinate space of the optical system into a 4D polynomial and employing numerical iteration to determine the rays closest to the preset wave aberration boundary at each surface point. Converting the FOVs and EP sampling into optical surface sampling significantly reduces the number of samples required, achieving computational efficiency without compromising accuracy in determining tolerable surface errors. We demonstrate the effectiveness of our method through tolerance analysis of two different freeform imaging systems. Furthermore, a tolerance analysis example of a complete off-axis three-mirror optical system demonstrates the universality of the process.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131299"},"PeriodicalIF":2.2,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

First real-time single-span 106-km field trial using commercial 130-Gbaud DP-QPSK 400 Gb/s backbone OTN transceivers over deployed multi-core fiber cable 通过已部署的多芯光纤电缆使用商用 130-Gbaud DP-QPSK 400 Gb/s 主干 OTN 收发器进行首次实时单跨 106 公里现场试验

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-14 DOI: 10.1016/j.optcom.2024.131308

Jian Cui , Yu Deng , Zhuo Liu , Yuxiao Wang , Bin Wu , Chengxing Zhang , Jiabin Wang , Baoluo Yan , Li Zhang , Bin Hao , Chao Wu , Leimin Zhang , Yong Chen , Xuechuan Chen , Hu Shi , Lei Shen , Lei Zhang , Jie Luo , Yan Sun , Qi Wan , Ninglun Gu

{"title":"First real-time single-span 106-km field trial using commercial 130-Gbaud DP-QPSK 400 Gb/s backbone OTN transceivers over deployed multi-core fiber cable","authors":"Jian Cui , Yu Deng , Zhuo Liu , Yuxiao Wang , Bin Wu , Chengxing Zhang , Jiabin Wang , Baoluo Yan , Li Zhang , Bin Hao , Chao Wu , Leimin Zhang , Yong Chen , Xuechuan Chen , Hu Shi , Lei Shen , Lei Zhang , Jie Luo , Yan Sun , Qi Wan , Ninglun Gu","doi":"10.1016/j.optcom.2024.131308","DOIUrl":"10.1016/j.optcom.2024.131308","url":null,"abstract":"<div><div>Weak-coupled space-division multiplexing (SDM) technique using multi-core fibers (MCF) has attracted great research interests due to its huge capacity potential and compatibility with high-speed transceivers. In this paper, we demonstrate the first real-time 128 Tb/s and 224 Tb/s single-span 106-km field trial over deployed 4-core and 7-core MCF cable with 65 multi-core fusion splicing using commercial DP-QPSK 400 Gb/s backbone optical transport network (OTN) transceivers. The 4-core and 7-core transmission systems still reserve with more than 5.5-dB and 3.5-dB OSNR margins respectively thanks to the 130-Gbaud DP-QPSK modulation format enabled by optoelectronic multiple-chip module (OE-MCM) packaging technique. The MCF cable has a length of 17.69 km and the contained MCFs are with standard 245-μm coating, which enables the compatibility with standard cabling processing. This field trial marks the maturity of MCF-based weakly-coupled SDM transmission systems and is an important milestone towards the implementation of MCF in high-speed terrestrial cable systems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131308"},"PeriodicalIF":2.2,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

The study of capillary discharge Ne-like 46.9 nm laser with a 2.5 mm inner diameter capillary 使用内径为 2.5 毫米的毛细管进行毛细管放电的类 Ne 46.9 纳米激光研究

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-14 DOI: 10.1016/j.optcom.2024.131257

Dongdi Zhao , Huaiyu Cui , Shuai Wang , Yuebin Yi , Bo An , Zhigang Fan , Yongpeng Zhao

引用次数: 0

A novel BP-GA based autofocus method for detection of circuit board components 基于 BP-GA 的新型自动对焦方法，用于检测电路板元件

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-14 DOI: 10.1016/j.optcom.2024.131246

Guangyi Zhu , Siyuan Wang, Lilin Wang

{"title":"A novel BP-GA based autofocus method for detection of circuit board components","authors":"Guangyi Zhu , Siyuan Wang, Lilin Wang","doi":"10.1016/j.optcom.2024.131246","DOIUrl":"10.1016/j.optcom.2024.131246","url":null,"abstract":"<div><div>Optical micro-inspection systems use different focusing methods depending on the inspection requirements of different scenarios. In practical industrial micro-inspection, grid samples have a wide variety of components, for example, electronic components on circuit boards and transistors on electronic chips. Changes in the surrounding environment (e.g., brightness of light, flatness of the platform, and temperature, etc.) during the inspection of these processed parts may lead to out-of-focus of the object under the microscope. Therefore, this paper proposes an autofocus algorithm to cope with the complex environment during inspection. The algorithm is based on feature vectors reflecting the external geometry of the spot and the internal energy distribution, and is combined with a back-propagation neural network with a genetic algorithm (GA) to enhance the focusing capability of the optical microscope. Preliminary numerical test results show that because of the bias problem in the focusing system, the accuracy of the neural network in calculating the defocused amount (DA) is significantly improved, despite the pitfalls of its generalization ability and the possibility of endless loops during the focusing process. In order to further solve the pitfalls of neural networks, this paper introduces a full reference image evaluation model into the optical microscope system and finally develops the autofocus software. Focusing tests using the developed software for the inspection of real components demonstrate that the introduced full reference image evaluation model not only expands the focusing distance of the inspection system, but also prevents the autofocus algorithm from falling into a dead loop.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131246"},"PeriodicalIF":2.2,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Optical light scattering to improve image classification via wavelength division multiplexing 通过波分复用改进图像分类的光学光散射技术

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-13 DOI: 10.1016/j.optcom.2024.131302

JiaJun He, Huan Liu, HongJie Cao, YanLong Meng, YangHui Li, Juan Kang, Le Wang, Yi Li

引用次数: 0

Non-magnetic continuum quasi bound terahertz non-reciprocal device 非磁性连续准约束太赫兹非互易器件

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-13 DOI: 10.1016/j.optcom.2024.131310

Ya-Li Liu, Jiu-sheng Li

引用次数: 0

Three-dimensional endoscopic imaging system based on micro-lithography mask structured light projection 基于微光刻掩膜结构光投影的三维内窥镜成像系统

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-13 DOI: 10.1016/j.optcom.2024.131295

Jiayi Huo, Jiaying He, Jiayao Zhou, Bo Yuan, Xuxiang Ni, Liqiang Wang

{"title":"Three-dimensional endoscopic imaging system based on micro-lithography mask structured light projection","authors":"Jiayi Huo, Jiaying He, Jiayao Zhou, Bo Yuan, Xuxiang Ni, Liqiang Wang","doi":"10.1016/j.optcom.2024.131295","DOIUrl":"10.1016/j.optcom.2024.131295","url":null,"abstract":"<div><div>To achieve effective in-situ endoscopic diagnosis and treatment, the measurement of the size of lesions (such as tumors) and the characterization of their shape are important. However, the application of binocular endoscopy is still limited due to issues such as the lack of texture in some scenes, difficulty in matching, and large computational load. To address this, we have developed a 3D endoscopic imaging system based on micro-lithography mask structured light projection to measure the shape and size of targets within the endoscopic view. Firstly, a brand new mechanical design was implemented for the endoscope tip to integrate both white light and structured light channels. Then, a projection lens based on Q-type aspheric design and a micro-lithography mask based on the M-array were designed to achieve high contrast and high-resolution structured light projection in the endoscopic scene. Finally, by identifying feature points in the target and reference images, pixel matching and disparity calculation were achieved, allowing for 3D reconstruction. Our proposed 3D endoscopic imaging system was validated in a gastric model and a cervical model, where the model was reconstructed and compared with the ground truth, yielding mean RMSE of 0.20–0.31 mm at a working distance of about 40 mm, thus confirming the effectiveness of our system.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131295"},"PeriodicalIF":2.2,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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