Optics Communications最新文献_第3页

Scattering of a zero-order bessel beam by a plasma anisotropic sphere 等离子体各向异性球体对零阶贝塞尔光束的散射

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-19 DOI: 10.1016/j.optcom.2024.131318

Zheng Jun Li , Kai Yang , Tan Qu

{"title":"Scattering of a zero-order bessel beam by a plasma anisotropic sphere","authors":"Zheng Jun Li , Kai Yang , Tan Qu","doi":"10.1016/j.optcom.2024.131318","DOIUrl":"10.1016/j.optcom.2024.131318","url":null,"abstract":"<div><div>Based on the generalized Lorenz-Mie theory (GLMT) and the Fourier transform method, the scattering of a plasma anisotropic spherical particle illuminated by a zero-order Bessel beam (ZOBB) are studied. Both the on-axis and off-axis incident cases is considered. Using the vector wave theory, the expansion coefficients of the incident ZOBB in terms of the spherical vector wave functions (SVWFs) are obtained. According to the orthogonality of the associated Legendre function and exponential function, concise expressions of the expansion coefficients for the on-axis and off-axis incident ZOBB are derived, and the expressions can effectively reconstruct the ZOBB with all conical angles. The differences of scattering characteristics of a plasma anisotropic sphere illuminated by an on-axis and off-axis ZOBB are exhibited. Influences of the conical angle, particle size, off-axis distance and anisotropic parameters on the angle distributions of the radar cross section (RCS) are analyzed in detail. The unique internal and near field distributions of a plasma anisotropic spherical particle illuminated by an on-axis and off-axis ZOBB are demonstrated. The results provide insights into the scattering and wave-matter interactions and may find important applications in optical propagation and optical micromanipulation of biological and anisotropic complex particles, microwave engineering and target shielding.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131318"},"PeriodicalIF":2.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700257","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

Continuous-variable measurement-device-independent quantum key distribution over fluctuated free space quantum channels 波动自由空间量子信道上与测量设备无关的连续可变量子密钥分发

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-19 DOI: 10.1016/j.optcom.2024.131294

Zhenghao Yao , Ming Li , Zhigeng Wu , Tianyi Wang , Milorad Cvijietc

{"title":"Continuous-variable measurement-device-independent quantum key distribution over fluctuated free space quantum channels","authors":"Zhenghao Yao , Ming Li , Zhigeng Wu , Tianyi Wang , Milorad Cvijietc","doi":"10.1016/j.optcom.2024.131294","DOIUrl":"10.1016/j.optcom.2024.131294","url":null,"abstract":"<div><div>The fluctuations in transmittance caused by atmospheric turbulence will impact the free space continuous-variable measurement-device-independent quantum key distribution (CV MDI QKD). Recently, a study in Ghalaii and Pirandola (2023) has demonstrated that the CV MDI QKD protocol is capable of achieving composable security over hundreds of meters free-space channels without concerning fluctuations even in strong collective eavesdropping scenario. In this paper, we investigate the free-space CV MDI QKD by taking the transmittance fluctuations into account. We analyze the security of free-space CV MDI QKD with the methodology of ensemble average. Also, the secret key rates are evaluated by use of the post-selection strategy with respect to the fluctuated transmittance. It is concluded that the post-selection strategy can significantly improves the secret key rate, especially when dealing with the finite size effect. Additionally, the post-selection enables a higher secret key rate compared to solely using ensemble average without post-selection as well as fluctuation-free strategy in Ghalaii and Pirandola (2023).</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131294"},"PeriodicalIF":2.2,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700857","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

Mo0.5W0.5S2 as saturable absorber for passively mode-locked Tm:YAP laser 用于被动模式锁定 Tm:YAP 激光器的可饱和吸收体 Mo0.5W0.5S2

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-19 DOI: 10.1016/j.optcom.2024.131329

Huanli Wang, Xudong Sun, Qianqian Hao, Linjun Li

引用次数: 0

Versatile MDM-OFDM system with selectable single-mode half-subcarrier or two-mode full-subcarrier multiplexing 多功能 MDM-OFDM 系统，可选择单模半子载波或双模全子载波复用

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-19 DOI: 10.1016/j.optcom.2024.131331

Takahiro Kodama , Gabriella Cincotti

引用次数: 0

Multi-channel FBG frequency division multiplexing sensing system based on EOIM and OFDL

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-18 DOI: 10.1016/j.optcom.2024.131320

Ruofan Wang , Xuezhi Zhang , Shengliang Zhang , Wenxin Bo , Jiapeng Sun , Kun Liu , Tiegen Liu , Junfeng Jiang

{"title":"Multi-channel FBG frequency division multiplexing sensing system based on EOIM and OFDL","authors":"Ruofan Wang , Xuezhi Zhang , Shengliang Zhang , Wenxin Bo , Jiapeng Sun , Kun Liu , Tiegen Liu , Junfeng Jiang","doi":"10.1016/j.optcom.2024.131320","DOIUrl":"10.1016/j.optcom.2024.131320","url":null,"abstract":"<div><div>This paper introduces a multi-channel fiber Bragg grating (FBG) frequency division multiplexing sensing scheme based on Electro-optic intensity modulator (EOIM) and optical fiber delay line (OFDL), which integrates time-division multiplexing (TDM), spatial division multiplexing (SDM), and frequency division multiplexing (FDM) technologies to create a hybrid multiplexing solution. The scheme employs EOIM to construct optical carriers and utilizes OFDL delay processing for frequency allocation, enabling synchronous monitoring of multiple ultrasonic vibration signals. In the dual-channel experiment, the signal-to-noise ratio (SNR) of the demodulated signals typically exceeds 40 dB, with an optimal SNR reaching 61.8 dB. Additionally, crosstalk suppression between the two signals generally exceeds 30 dB, achieving a maximum of 58.7 dB in ideal conditions. These results, based on the two key indicators of SNR and crosstalk suppression, demonstrate the feasibility and outstanding performance of the proposed multiplexing scheme.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"576 ","pages":"Article 131320"},"PeriodicalIF":2.2,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744908","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

Design method of broadband filter array with high light efficiency 高光效宽带滤波器阵列的设计方法

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-17 DOI: 10.1016/j.optcom.2024.131315

Zonglin Liang , Bo Zhang , Yuanming Zhao , Zheng Zhen , Mingxu Piao , Shoufeng Tong

{"title":"Design method of broadband filter array with high light efficiency","authors":"Zonglin Liang , Bo Zhang , Yuanming Zhao , Zheng Zhen , Mingxu Piao , Shoufeng Tong","doi":"10.1016/j.optcom.2024.131315","DOIUrl":"10.1016/j.optcom.2024.131315","url":null,"abstract":"<div><div>Spectral filter array (SFA) imaging is a noval spectral image acquisition method that sets a filter array on one single sensor. It is widely used for environmental monitoring, agricultural assessment, geological exploration, and medical diagnosis. The spectral sensitivities on SFA highly influence the imaging and reconstruction quality. In low-light environments, the imaging quality of the narrowband filter array is significantly compromised, resulting in inadequate image brightness and loss of detail. To address the challenge that heuristic search methods often struggle to find the optimal solution, this paper presents a numerical design method for a global optimal broadband filter array with high light efficiency. The optimal broadband filter array is obtained by maximizing the minimal pairwise angles between filter vectors, and a light efficiency regularization term is used to ensure more light passes through. Further, a prototype spectral imaging system comprising a broadband filter array is built and demonstrated. The findings from the simulations conducted with publicly available multispectral datasets indicated that the broadband filter array demonstrated superior accuracy and enhanced noise resistance in the reconstruction of spectral information when compared to the narrowband filter array. Simultaneously, the simulation results demonstrated that excessive light efficiency will reduce both the anti-noise ability and the accuracy of the reconstruction. Thus, it is essential to choose a broadband filter array that demonstrates satisfactory light efficiency. This study will be beneficial to optimizing the filter array of broadband spectral imaging sensors.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131315"},"PeriodicalIF":2.2,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700293","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

Phase-transition-driven polarization and intensity modulation in GST metasurfaces

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-17 DOI: 10.1016/j.optcom.2024.131322

Zengyue Zhao , Feilong Yu , Jin Chen , Xuenan Li , Jiuxu Wang , Guanhai Li , Xiaoshuang Chen , Wei Lu

{"title":"Phase-transition-driven polarization and intensity modulation in GST metasurfaces","authors":"Zengyue Zhao , Feilong Yu , Jin Chen , Xuenan Li , Jiuxu Wang , Guanhai Li , Xiaoshuang Chen , Wei Lu","doi":"10.1016/j.optcom.2024.131322","DOIUrl":"10.1016/j.optcom.2024.131322","url":null,"abstract":"<div><div>Metasurfaces, especially those employing phase-change materials (PCMs) like Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (GST), have revolutionized subwavelength light manipulation, promising enhanced reconfigurability in nanophotonic devices. Despite their potential, the limited tunability in terms of states and dimensions has hindered broader applications. Here, we propose a GST-based reconfigurable metasurface capable of simultaneously modulating transmissivity, phase, and polarization. Leveraging the full states of phase transitions from amorphous to crystalline states, the metasurface can elaborately adjust the focal spot's intensity based on amplitude and phase joint regulation. Our design exploits the refractive index shifts during phase transition and phase modulation discrepancies between the two axes of composite nanorods, allowing for dynamic transitions across three polarization states, with each state's transmittance decreasing sequentially. Furthermore, we demonstrate the metasurface's ability to transition from multichannel vectorial holography to near-perfect absorption by eliminating the limitations imposed by intermediate phase states. These advancements represent a new way to multi-dimensional, multi-state tunable photonic systems, broadening the scope for novel optical devices.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"576 ","pages":"Article 131322"},"PeriodicalIF":2.2,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744825","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

Design and fabrication of subwavelength antireflective microstructures on diamond surfaces 在金刚石表面设计和制造亚波长抗反射微结构

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-16 DOI: 10.1016/j.optcom.2024.131316

Youwang Hu , Shoutao Chen , Dejian Kong , Mingyang Yang , Xiaoyan Sun , Ji'an Duan

{"title":"Design and fabrication of subwavelength antireflective microstructures on diamond surfaces","authors":"Youwang Hu , Shoutao Chen , Dejian Kong , Mingyang Yang , Xiaoyan Sun , Ji'an Duan","doi":"10.1016/j.optcom.2024.131316","DOIUrl":"10.1016/j.optcom.2024.131316","url":null,"abstract":"<div><div>In this study, subwavelength microstructures on diamond have been investigated numerically and experimentally to attain high transmittance over a broad bandwidth in the mid-infrared(MIR) wavelength range of 8∼14 μm.A simulation model was established using FDTD software to theoretically investigate the influence of changes in microstructure parameters on the transmittance enhancement performance, and the relationship between microstructure parameters and transmittance was macroscopically demonstrated based on infrared spectral value distribution diagrams. Fabrication of square frustum microstructure arrays on diamond surfaces by airflow-assisted femtosecond laser in an air environment. The structure was created on a single work surface. The fabricated samples achieved full-wavelength transmittance enhancement in the MIR band from 8 μm to 14 μm, and the average transmittance was increased from 70.0% to 77.5%, of which the transmittance at 9 μm wavelength was increased by 8.3%. The experimental results illustrate that the fabricated microstructures have good transmittance enhancement performance.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131316"},"PeriodicalIF":2.2,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700852","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

Super-resolution reconstruction of light field image based on dynamic adjustment of attention mechanism 基于注意力动态调整机制的光场图像超分辨率重建

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-16 DOI: 10.1016/j.optcom.2024.131317

Wei Feng, Jichen Sun, Bincheng Wang, Jiangtao Xu, Zhongsheng Zhai

{"title":"Super-resolution reconstruction of light field image based on dynamic adjustment of attention mechanism","authors":"Wei Feng, Jichen Sun, Bincheng Wang, Jiangtao Xu, Zhongsheng Zhai","doi":"10.1016/j.optcom.2024.131317","DOIUrl":"10.1016/j.optcom.2024.131317","url":null,"abstract":"<div><div>The light field imaging has the problem of mutual restriction between spatial resolution and angular resolution. In this paper, we propose a new blind network based on dynamic adjustment of attention mechanism, and the network can reconstruct the low-resolution images with the multiple blur kernels and noise levels to realize super-resolution reconstruction of the light field images. Firstly, the original sub-aperture images array with low-resolution is used to estimate the blur kernel and noise level as auxiliary information. Then, the parameter features are extracted by the dynamic adjustment module, and the degradation representation is combined with the image features to adapt to various blur kernels and noises. After that, the feature information of the light field image is calculated by the distg-block attention block, and a finer feature map can be obtained for subsequent network learning. Finally, the feature map is up-sampled to obtain a sub-aperture image array. The experimental results show that the proposed method can improve the spatial resolution of the light field images by four times, and obtain clearer light field images with more details.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131317"},"PeriodicalIF":2.2,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700860","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

A single dual-frequency reflective metasurface for simultaneous multi-mode orbital angular momentum multiplexing 用于同时进行多模式轨道角动量复用的单一双频反射元表面

IF 2.2 3区物理与天体物理

Optics Communications Pub Date : 2024-11-15 DOI: 10.1016/j.optcom.2024.131313

Cuicui Zhao , Dexian Yan , Xiangjun Li , Yi Wang , Le Zhang , Jining Li

{"title":"A single dual-frequency reflective metasurface for simultaneous multi-mode orbital angular momentum multiplexing","authors":"Cuicui Zhao , Dexian Yan , Xiangjun Li , Yi Wang , Le Zhang , Jining Li","doi":"10.1016/j.optcom.2024.131313","DOIUrl":"10.1016/j.optcom.2024.131313","url":null,"abstract":"<div><div>In this paper, we propose a dual-frequency reflective metasurface that utilizes geometric phase to achieve multiple modes of orbital angular momentum (OAM). The metasurface consists of two metal layers and a dielectric layer sandwiched between them, with independent control of amplitude and phase modulation at two frequency points by rotating the outer split ring and inner cross structures on the top layer of the metasurface. When circularly polarized (CP) terahertz waves impinge on the metasurface, it is possible to achieve a single-beam normal reflection, single-beam anomalous reflection, and dual-beam reflection in the form of OAM vortex beams. Specifically, for right-hand circular polarization (RCP) incidence, at the frequency of 140 GHz, its vertical reflection is the OAM beam of mode +2, and at the frequency of 200 GHz, its vertical reflection is the OAM beam of mode +1; for left-hand circular polarization (LCP) incidence, at the frequency of 140 GHz, its vertical reflection is the OAM beam of mode −2, and at the frequency of 200 GHz, the corresponding vertical reflection is the OAM beam of mode −1. Additionally, anomalously reflected OAM beams are designed, which, after RCP incidence on the metasurface, produce an OAM beam with mode −1 and a reflection angle of 17° at 140 GHz, and an OAM beam with mode +1 and a reflection angle of 12° at 200 GHz. Finally, a dual-beam OAM reflective metasurface is designed, which generates two vortex beams with mode +2 at 140 GHz and two vortex beams with mode +1 at 200 GHz under RCP incidence. Therefore, the metasurface designed in this paper has broad application prospects in multi-channel transmission for future terahertz communication systems.</div></div>","PeriodicalId":19586,"journal":{"name":"Optics Communications","volume":"575 ","pages":"Article 131313"},"PeriodicalIF":2.2,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700256","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