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arXiv 2025年

作者： Lin, Jadon Y. de Sterke, C. Martijn Ilic, Ognjen Kuhlmey, Boris T. School of Physics The University of Sydney SydneyNSW2006 Australia Institute of Photonics and Optical Science The University of Sydney SydneyNSW2006 Australia Department of Mechanical Engineering University of Minnesota MinneapolisMN55455 United States The University of Sydney Nano Institute The University of Sydney SydneyNSW2006 Australia

Lightsails are a highly promising spacecraft concept that has attracted interest in recent years due to its potential to travel at near-relativistic speeds. Such speeds, which current conventional crafts cannot reach, offer tantalizing opportunities to probe nearby stellar systems within a human lifetime. Recent advancements in photonics and metamaterials have created novel solutions to challenges in propulsion and stability facing lightsail missions. This review introduces the physical principles underpinning lightsail spacecrafts and discusses how photonics coupled with inverse design substantially enhance lightsail performance compared to plain reflectors. These developments pave the way through a previously inaccessible frontier of space exploration. © 2025, CC BY.

关键词： Space research

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Improving the Performance of ZnO Nanorod Piezoelectric Nanogenerators by Tuning the PEDOT: PSS as an Intermediate Layer

Improving the Performance of ZnO Nanorod Piezoelectric Nanog...

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International Laser Technology and Optics Symposium 2024, iLATOS2024

作者： Asmarita, Yulmaisi Dwi Fadhullah, Naufal Fiego Mufti, Nandang Pujiarti, Herlin Paradita, Dhea Kurniawan, Robi Salim, Ali Aqeel Ismail, Hasan Department of Physics Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Malang65145 Indonesia Center of Advanced Material for Renewable Energy Universitas Negeri Malang Malang65145 Indonesia Universiti Teknologi Malaysia Johor Johor Bahru81310 Malaysia Department of Mechanical Engineering Universitas Negeri Malang Malang65145 Indonesia

The coating design of a piezoelectric nanogenerator (PENG) was optimised to enhance the performance of ZnO nanorod-based PENGs by fine-tuning the PEDOT: PSS intermediate layer. ZnO nanorods were synthesised using the hydrothermal method at 90°C for 5 hours. The PEDOT: PSS layer was deposited via spin coating at rotation speeds (2000-5000 rpm). Furthermore, PDMS and Cu material layers were deposited using spin coating and magnetron sputtering, respectively, ensuring optimal layer characteristics for improved energy harvesting efficiency. The PENGs were fabricated with a material structure of ITO-PET/ZnO/PEDOT: PSS/PDMS/Cu. various characterization tools including XRD, SEM, Uv-vis, and voltage-current (I-v) measurements were used to determine the materials’ structural, surface morphological, optical properties and their impact on PENG performance. The XRD diffraction patterns of ZnO nanorods coated with PEDOT: PSS revealed a hexagonal wurtzite crystal structure and amorphous phase with a lattice fringe of ~0.52 nm and a crystal size of ~67.91 nm. SEM analysis determined that the average diameter of ZnO nanorod was 67.2 ± 0.48 nm with a thickness of 1297 ± 29.22 nm. The absorption spectra of ZnO/PEDOT: PSS layers were observed in the range of 260-380 nm with an energy bandgap of 3.28 to 3.13 nm, indicating that a thicker PEDOT: PSS layer, resulted in a smaller bandgap with higher PENG conductivity at 8.97 Watt. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Spin coating

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current developments in optical design and optical engineering

Current Developments in Optical Design and Optical Engineeri...

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current developments in optical design and optical engineering 1991

The proceedings contain 54 papers. The topic discussed include: global optimization using the y-ybar diagram;two-mirror projection systems for simulating telescopes;two-mirror projection systems for simulating telescopes;surface contributions of the wave aberrations up to the eighth degree;membrane light modulators: engineering design considerations;plastic lens array with the function of forming unit magnification erect image using roof prisms;spatial frequency selective error sensing for space-based, wide field-of-view, multiple-aperture imaging systems;novel interferometer setup for evaluating the sum of surface contributions to transmitted wavefront distortion;and alignment of an aspheric mirror subsystem for an advanced infrared catadioptric system.

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Recent progress in structural design strategies of high-birefringence optical crystals

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Coordination Chemistry Reviews 2025年 540卷

作者： Xu, A-Lan Ran, Mao-Yin Wu, Xin-Tao Lin, Hua Zhu, Qi-Long State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108 China College of Chemistry and Materials Science Fujian Normal University Fuzhou 350002 China Fujian College University of Chinese Academy of Sciences Fuzhou 350002 China

Large birefringence is a crucial property for optical functional crystals, such as birefringent crystals, as it enables the miniaturization of optical devices in laser systems. The optimization of birefringence has become a global research focus, leading to various structural design strategies aimed at enhancing this property. However, a comprehensive review of these approaches has been lacking until now. In this review, we present the latest structural design strategies for achieving high-performance birefringent crystals, focusing on developments since 2020. These strategies include: (i) integrating π-conjugated groups with intrinsic polarization anisotropy into crystal structures, (ii) incorporating stereochemically active lone-pair electron-containing cations, (iii) utilizing collaborative assembly methods that combine organic and inorganic functional units, (iv) discovering new functional anionic motifs with large polarization anisotropy, (v) introducing heteroanionic cations, and (vi) applying dimension-reduction strategies. We provide a detailed overview of the synthesis, characterization, and structure-activity relationships of these compounds. Furthermore, we examine the current achievements, limitations, and challenges in the field, while identifying promising avenues for future research. Our goal is to inspire continued innovation in the study of birefringent crystals and their advanced applications, ultimately contributing to the development of next-generation optical materials and devices. We hope this review serves as a catalyst for further groundbreaking research in the field of birefringent crystals. © 2025 Elsevier B.v.

关键词： Birefringence Birefringent crystals optical anisotropy Structural design strategies Structure-activity relationships

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design and Analysis of Dual-Band Rectenna for Internet of Things Applications 5th

Design and Analysis of Dual-Band Rectenna for Internet of Th...

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5th International Conference on Recent developments in Control, Automation and Power engineering, RDCAPE 2023

作者： Rajawat, Asmita Agrawal, Kushagra M. Tola, Raghav Acropolis Institute of Technology and Research Indore India Amity University Uttar Pradesh Noida India

ISBN: (纸本)9789819600465

The paper focuses on the designing of dual-band microstrip rectenna with the purpose of harvesting RF energy for the Wi-Fi frequency range. Rectenna can convert the RF energy present in the environment into direct current (DC) which is used to power various low energy-consuming devices. The proposed rectenna is supposed to be used as an alternate to conventional energy source for low power devices involved in IoT systems. The microstrip rectenna resonates at 900 MHz frequency and 2.45 GHz frequency which are the operating frequency of Wi-Fi HaLow technology and conventional Wi-Fi technology which is advantageous for IoT applications. Air is used as a substrate with dielectric permittivity of 1.0 for the development of antenna. The design and simulation of the antenna were conducted using Computer Simulation Technology (CST) Studio Suite The rectifier circuit employed in this study utilized an HSMS-285C Schottky diode in conjunction with a Greinacher voltage doubler circuit. Advanced design System (ADS) was used for the simulation purpose of rectifier. The antenna operates at 900 MHz with gain of 8.84 dB and at 2.45 GHz with the gain of 8.82 dB and S11 below −10 dB. The proposed rectifier achieves peak output voltage of 3.269 v with a conversion efficiency of 71.235% for 900 MHz and maximum output of 3.142 v that has conversion efficiency of 65.801% for 2.45 GHz which can be used for powering low power IoT devices operating on Wi-Fi HaLow as well as conventional Wi-Fi. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Microstrip antennas

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current developments in Lens design and optical engineering XXv

Current Developments in Lens Design and Optical Engineering ...

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current developments in Lens design and optical engineering XXv 2024

ISBN: (纸本)9781510679221

The proceedings contain 19 papers. The topics discussed include: athermalizing mounted doublets with ALLvAR alloys;using off-the-shelf components in the design of curved compound eye camera systems;Uv-replicated monolithic polymer optics for high-volume imaging and sensing applications;recent progress on raytracing through metasurfaces;silicon metalens toward a fully silicon integrated SWIR sensing;power allocation schemes in optical wireless communication;development of transmission and receiving optical antenna for free space laser communication;design of ophthalmic contact lens using Q-type aspheres with reduced error budget for high visual acuity;and optical simulation of the white light display color change of the bulk scattering diffuser used in the mini-LED backlight module.

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current developments in Lens design and optical engineering IX

Current Developments in Lens Design and Optical Engineering ...

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current developments in Lens design and optical engineering IX

ISBN: (纸本)9780819472809

The proceedings contain 26 papers. The topics discussed include: low-scatter bare aluminum optics via chemical mechanical polishing;forces acting between polishing tool and workpiece surface in magnetorheological finishing;material removal study at silicon nitride molds for the precision glass molding using MRF process;design and fabrication of low-cost thermal imaging optics using precision chalcogenide glass molding;day and night security camera;high-resolution Uv relay lens for particle size distribution measurements using holography;new tools for the lens designer;optical design of reflective wide-field cameras;five-lens corrector for Cassegrain-form telescopes;material selection for color correction in the short-wave infrared;correctly making panoramic imagery and the meaning of optical center;and 3D imaging from theory to practice: the Mona Lisa story.

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current developments in Lens design and optical engineering XXIv

Current Developments in Lens Design and Optical Engineering ...

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current developments in Lens design and optical engineering XXIv 2023

ISBN: (纸本)9781510665460

The proceedings contain 14 papers. The topics discussed include: wide field of regard metalens receiver for free space optical communication;optimization of freeform spectacle lenses based on high-order aberrations;hybrid refractive-metalens design for imaging applications;hybrid refractive-metalens design for imaging applications;halogen source illumination optimization using a beam shaping biconic lens array;multi-aperture pattern projection using arbitrary shaped microlenslets;variable-angle, spectroscopic ellipsometry study on the repeated application of first contact polymer on silicon-based surfaces;convolutional neuronal network to restore images encoded by a wavefront coding imaging system;and spectrally aligned integration of miniaturized substrate-free thin-film filters for fiber optical networks.

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visioGuide: An AI for visually Impaired

VisioGuide: An AI for Visually Impaired

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Sentiment Analysis and Deep Learning (ICSADL), International Conference on

作者： R Shashanka Anisha Devi K Lakith Gowda S Kushal v Ravi Kumar Information Science and Engineering (Autonomous) Vidyavardhaka College Of Engineering (VTU Belagavi) Mysore India

ISBN: (数字)9798331523923

ISBN: (纸本)9798331523930

In today's rapidly changing technological environment, there is a rising acknowledgment of the need for independent living for visually impaired people who confront major social inclusion issues. They may need human support to navigate these situations. visually impaired people frequently lack access to critical information about their surroundings because visual information is crucial to most daily actions. Support for visually impaired people is on the rise; however, some factors bring about disparity in this support. Most of the recent developments in assistive technology create a platform to not only address this particular gap but also enhance, especially the support for the visually impaired. This research intends to develop an application for the Android platform to encourage self-reliance and social inclusion of the visually impaired. It uses current communication technologies, artificial intelligence, visual recognition, and machine learning. The application includes features like voice command, OCR, navigation, emergency call, screen reader, and connectivity to other service apps such as uber, among others. Moreover, it works in Kannada also to encourage its usage. The primary objective is to promote more freedom and inclusion among the sight impaired. This smart solution seeks to enhance the standards of living for blind or vision impaired people and motivate their active participation in modern technological advances by encouraging them to interact with the surroundings through the different features of the app.

关键词： visualization Sentiment analysis Navigation optical character recognition Urban areas Speech recognition Assistive technologies Real-time systems Text to speech Standards

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Renewing Fiber Optics Infrastructure on Mature Offshore Assets at Campos Basin

Renewing Fiber Optics Infrastructure on Mature Offshore Asse...

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Offshore Technology Conference, OTC 2025

作者： Ribeiro, H.L.v.F. Aloise, D. Silva, E.D. Siqueira, B.B. Nascimento, G.L. Davico, S.P. A B PETROBRAS RJ Rio de Janeiro Brazil

ISBN: (纸本)9781959025610

The "New Fiber Optic Network for Campos Basin" Project is a strategic initiative aimed at renewing the Campos Basin mature offshore assets' communication infrastructure. The project began as a business case proposition in 2020 and initiated the construction in 2024. It involves laying 500km fiber optic cables connecting two onshore stations, in Rio de Janeiro and Espírito Santo States to 12 stationary production units at depths of up to 1,800m, providing 100 Gbps links. The paper will describe all the steps in the project approval and deployment phases, including a technical description of the solutions selected for implementation, the risks associated with such choices, and how they are being mitigated. The first illumination is scheduled to take place in 2025, and as such the project is in an advanced completion stage, which shall provide valuable insights into the way in which the project is being implemented. The business case demonstrates the project strategic importance to assure investments returns by supporting the use of current and new technology on monitoring and controlling production and to assure operational safety from remote control rooms and real time integrated operation centers. The project is being executed through an engineering, procurement, construction, and installation (EPCI) contract, which is a comprehensive approach that covers the main aspects of the project from design to installation. During the initial phase, a thorough evaluation was conducted to determine the feasibility and value of investing in connectivity for mature field assets. This involved assessing the infrastructure ability to ensure actual increase of oil production. In the second phase, the project scope was detailed, designed, and the hiring strategy was defined. This phase took place in a post-pandemic booming market scenario and included not only the offshore installation of the optical fiber network but also necessary adjustments to the operating platforms and the de

关键词： Gas industry

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