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Smart Electronics and Communication Systems (ISENSE), International Conference on

作者： Titto Anujan Tony Jose Vismaya Vijayan Division of ECE Karunya Institute of Technology and Sciences Coimbatore Tamil Nadu Department of Electronics and Communication Engineering College of Engineering Trivandrum Kerala India

ISBN: (数字)9798331528126

ISBN: (纸本)9798331528133

The frequency range of terahertz (THz) has shown great promise for optical communication due to its enormous bandwidth and low interference. This review paper provides a thorough analysis of the latest developments and current obstacles in THz optical *** microwave and infrared wavelengths, the terahertz (THz) frequency range has special possibilities for optical communication *** investigates how THz frequencies and optical communication are convergent, emphasising the latter's promise for high-bandwidth, low-latency data transfer. We investigate possible uses of THz optical communication, such as sensing, imaging, and wireless networks, highlighting the revolutionary influence of this new sector on the design of communication systems in the future.

关键词： Technological innovation Reviews Wireless networks optical attenuators optical imaging Microwave theory and techniques optical fiber communication optical sensors Research and development Terahertz communications

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Multisensors for BIM modeling and digital twinning of historical buildings: preliminary results on Circus of Maxentius in Rome 3

Multisensors for BIM modeling and digital twinning of histor...

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Multimodal Sensing and Artificial Intelligence: Technologies and Applications iii 2023

作者： Bianchini Ciampoli, L. Santarelli, R. Meriggi, P. Manalo, J.R.D. Ten, A. Loreti, E.M. Benedetto, A. Department of Civil Computer Science and Aeronautical Technologies Engineering Roma Tre University Via Vito Volterra 62 Rome00146 Italy Department of Classics Sapienza University of Rome Piazzale Aldo Moro 5 Rome00185 Italy Sovrintendenza Capitolina ai Beni Culturali Roma Capitale Piazza Lovatelli 35 Rome00186 Italy

ISBN: (纸本)9781510664517

Building Information Modeling (BIM) is a software-based parametric design approach that enables complete interoperability between all of the various actors engaged in a design or management process. Notwithstanding it was particularly developed for construction projects, it has since been applied to a variety of fields, including the design of transportation infrastructures and, more recently, cultural heritage. It has primarily been used in this area to improve the accuracy and efficiency of activities aimed at stabilizing and restoring historical structures. The purpose of the current study is to show how BIM is implemented by multisensors date and how the use of BIM can significantly raise the quality of virtual reconstructions and digital valorizations of historical structures, particularly when the rate of conservation is low. In spite of the fact that modern digital reconstruction models are frequently examined from an archaeological standpoint, their structural coherence has never been examined. This implies that many virtual models are likely to depict historically reliable structures that, due to their lack of structural logic, would not support their weight according to their geometric features and construction methods/materials. The research suggests a novel BIM-based methodology capable of both guiding and structurally testing archaeological reconstruction theories. The following procedure can serve as a broad representation of the model: 1- Multisensors survey of the emerging: gathering information from cursory historical investigations (topographic data, laser scanner, aero photogrammetry, satellite images) 2- Multisensors survey of the hidden: gathering information from ground-penetrating radar, electrical tomography, and magnetometry hypogeal scans;3- Mechanical characterization: collecting data on the materials used in the discovery and confirming their mechanical properties through load stress tests;4- Virtual reconstruction: the formulation of a p

关键词： Geological surveys

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Colloidal Plasmonic Nanocubes as Capacitor Building Blocks for Multidimensional optical Metamaterials: A Review

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ACS APPLIED NANO MATERIALS 2021年第10期4卷 9976-9984页

作者： Mann, Matthew E. Yadav, Pushpender Kim, Seokhyoung Michigan State Univ Dept Chem E Lansing MI 48824 USA Michigan State Univ Dept Chem Engn & Mat Sci E Lansing MI 48824 USA

Localized surface plasmon resonances of colloidal nanostructures are known for their extreme ability to focus light waves onto nanoscale volumes, making the resulting electric fields useful for various applications such as solar energy conversion, sensing, and surface-enhanced spectroscopies. Clusters and arrays of these colloidal nanostructures offer unique platforms to study and develop metaoptical properties that surpass those of naturally occurring materials such as bare metals or semiconductors. The metaoptical properties of these arrays depend on the orientation, geometry, and spacing of each nanostructure. Among various potential building blocks, colloidal nanocubes present a unique opportunity to exploit large capacitive coupling enabled by true nanoscale spacing between adjacent flat facets. In this review, we highlight the metaoptical property engineering of optical metamaterials prepared with colloidal nanocubes as nanocapacitor building blocks. We first discuss the origin of metaoptical properties of nanocube dimers in different geometries including a dimer with an axis perpendicular to the incident wavevector and a nanocube-on-mirror with an incident wavevector normal to the substrate. We then present design principles for achieving distinct optical properties from four different configurations: dilute random, dilute ordered, densely ordered in two or three dimensions, and densely ordered in well-faceted crystals. On the basis of these design rules, we highlight recent developments that focus on experimental demonstrations and conclude with the current challenges and outlook in nanocube-based optical metamaterials research.

关键词： nanocubes plasmonic nanoantenna capacitive coupling optical metamaterials metasurfaces metacrystals

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Metalens wide-angle receiver for free space optical communications 22

Metalens wide-angle receiver for free space optical communic...

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Conference on current developments in Lens design and optical engineering XXII

作者： Islam, Md Shafiqul Zaman, Imam Uz Sadri-Moshkenani, Parinaz Khan, Mohammad Wahiduzzaman Boyraz, Ozdal Univ Calif Irvine Irvine CA 92717 USA

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Receiver field of regard is one of the major problems for free space optical (FSO) communications. Drift or vibrations in transceiver orientations reduces effective communication time. The methods implemented to overcome this limitation, often require bulky optical and complex mechanical assemblies with feedback control, that are not suitable for long run operation in an airborne system. In this paper, we propose a novel receiver system that can effectively reduce the impact of pointing errors. The system is composed of two metalenses and one off-the-shelf conventional lens. The first metalens focuses optical beam incident at different angles on the aperture, at different locations on focal plane. The second metalens is placed on the focal plane of first metalens. After passing through the second metalens, the beams become parallel to optical axis of the receiver optical system. The parallel beams are collected by a suitable off-the-shelf aspheric lens and focused back on single detector that sits on a point on the optical axis. The system is designed and analyzed by physical optics theory. With 0.5 mm receiver aperture and 50 mm diameter aspheric lens, Zemax simulation shows that the system can collect +/-5-degree incident angle with detector diameter of 273 mu m. COMSOL frequency domain simulation with smaller diameter beam shows that the efficiency of the 2 metalens system is about 80%. Efficient metalens design and beam compression at detector plane are two key features of the proposed system. The system relaxes the strict requirement of aligning the transmitter and receiver unit in FSO communication.

关键词： Metalens free space optical communication wide angle receiver

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Recent developments in layered double hydroxide structures with their role in promoting photocatalytic hydrogen production: A comprehensive review

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INTERNATIONAL JOURNAL OF ENERGY RESEARCH 2022年第3期46卷 2093-2140页

作者： Sherryna, Areen Tahir, Muhammad Univ Teknol Malaysia Dept Chem Engn Sch Chem & Energy Engn Johor Baharu 81310 Johor Malaysia UAE Univ Chem & Petr Engn Dept Al Ain U Arab Emirates

Layered double hydroxides (LDHs) have received scientific attractions due to their unique two-dimensional (2D) structure, band gap tunability, and compositional flexibility, leading to the facile incorporation of the metal species into their layered structure. The main objective of this review is to explore the current advancement of LDH-based photocatalysts for photocatalytic hydrogen production by focusing on the role of divalent and trivalent metal incorporations and their efficiency enhancement. Firstly, the mechanism of photocatalysis and its thermodynamics has been explicated to gain basic understanding and fundamentals. Secondly, a brief introduction to the overview of LDH photocatalysts with special attention to the effects of cationic incorporations on the optical properties and computational study towards the electronic density has been demonstrated. Besides, the thermal stability of LDH is briefly discussed, focusing on the effects of temperature towards the conversion into mixed-metal oxide (MMO). Next, the classification of LDH based on divalent and trivalent cationic elements and their role in the brucite layer of LDH are systematically discussed. Attention is given to the mechanistic properties of the extensively studied metals, such as Mg, Ni, Zn, Co, Cr, Fe, V and Al, with the efficiency enhancements through various engineering aspects are demonstrated. The overview summary on the efficient design of LDH is elucidated to provide a deep understanding for improving their photocatalytic properties. Lastly, the future perspectives and recommendations are discussed to provide new insight into the potential of LDH and render them a notable place in solar energy applications.

关键词： band engineering layered double hydroxide LDH heterojunction strategies metallic classification photocatalytic hydrogen production thermodynamics analysis

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Integrated green-grey-blue system: a bibliometric analysis-based review 5

Integrated green-grey-blue system: a bibliometric analysis-b...

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5th International Conference on Green Energy, Environment, and Sustainable Development, GEESD 2024

作者： Jia, Ruilan Fu, Chun Gan, Yuqun School of Infrastructure Engineering Nanchang University Jiangxi Nanchang330038 China Design and Research Institute of Nanchang University Jiangxi Nanchang330038 China School of Public Policy and Management Nanchang University Jiangxi Nanchang330038 China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education Nanchang University Jiangxi Nanchang330038 China School of Civil Engineering and Architecture East China Jiaotong University Jiangxi Nanchang330100 China

ISBN: (纸本)9781510683006

The Integrated Green-Grey-Blue System (IGGBS) represents an advanced strategy for sustainable stormwater management, critically enhancing water resource efficiency and urban resilience. This study utilizes the Web of Science Core Database, R language’s Bibliometrix tool, and CiteSpace software to comprehensively review the research developments in IGGBS. The objective is to integrate international experiences and address current challenges and future directions. The findings indicate: (1) International research on IGGBS has shown consistent growth, with notable increases in China from 2020 to 2023, underscoring its significance in the development of sponge cities;(2) The majority of the studies are published in Q1 category journals of the Journal Citation Reports, predominantly authored by scholars from developed nations such as the USA, UK, and Germany, with fewer contributions from Chinese researchers;(3) IGGBS research is intricately linked with ecosystem services, climate change, urbanization, and resilience theory, trending towards more precise indicators and diverse objectives. Furthermore, the study highlights a gap between theoretical research and practical implementation, pointing to a lack of comprehensive exploration of coupling relationships and future uncertainties. It suggests the necessity to enhance evaluation systems, and foster interdisciplinary collaboration and public engagement, closely aligned with policy, to facilitate the broader adoption and management of IGGBS. © 2024 SPIE.

关键词： Climate change

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Band-structure-engineered high-gain LWIR photodetector based on a type-Ⅱ superlattice

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Light(Science & Applications) 2021年第2期10卷 140-146页

作者： Arash Dehzangi Jiakai Li Manijeh Razeghi Center for Quantum Devices Department of Electrical and Computer EngineeringNorthwestern UniversityEvanstonIL 60208USA

The LWIR and longer wavelength regions are of particular interest for new developments and new approaches to realizing long-wavelength infrared(LWIR)photodetectors with high detectivity and high *** photodetectors are highly desirable for applications such as infrared earth science and astronomy,remote sensing,optical communication,and thermal and medical ***,we report the design,growth,and characterization of a high-gain band-structure-engineered LWIR heterojunction phototransistor based on type-Ⅱ *** 1/e cut-off wavelength of the device is 8.0 *** 77 K,unity optical gain occurs at a 90 mV applied bias with a dark current density of 3.2×10^(-7)A/cm^(2).The optical gain of the device at 77 K saturates at a value of 276 at an applied bias of 220 *** saturation corresponds to a responsivity of 1284 A/W and a specific detectivity of 2.34×10^(13)cm Hz^(1/2)/W at a peak detection wavelength of~6.8 *** type-Ⅱ superlattice-based high-gain LWIR device shows the possibility of designing the high-performance gain-based LWIR photodetectors by implementing the band structure engineering approach.

关键词： heterojunction structure high

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optical current transformer for 765 kV AIS substation: A project review from certification to commissioning

Optical current transformer for 765 kV AIS substation: A pro...

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2022 IEEE/PES Transmission and Distribution Conference and Exposition, T and D 2022

作者： Heid, Thomas Simion, Constantin Vo, Minh Duc CONDIS SA Rossens Switzerland Hydro-Quebec Montreal Canada

ISBN: (纸本)9781665443296

This paper describes a pilot project, initiated by Hydro Quebec, implementing for the first time a 765kV optical current transformer (OCT) in one of HQ's substations. In this paper, we will discuss the project, starting from the concept to a series of pre-tests conducted at HQ's research laboratory IREQ. Based on this, the paper will elaborate the ecosystem of the project, including customer specifications and system design along with their respective implications on the product's design. Furthermore, the production and factory testing of the OCT and the merging unit (MU), as well as the complete certification cycle including testing of the MU and the primary OCT are discussed. This paper emphasizes the test plan and the applicable standards. In addition, the field installation and commissioning of the equipment up to the concluding site acceptance tests (SAT) are shown. Furthermore, the issues faced during different phases of the project along with the lessons learned and future developments of the concept are described. © 2022 IEEE.

关键词： Research laboratories

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Large volumetric optical-resolution photoacoustic microscopy with image fusion based on CNN feature extraction 22

Large volumetric optical-resolution photoacoustic microscopy...

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Conference on current developments in Lens design and optical engineering XXII

作者： Li, Sihang Wang, Zhuangzhuang Cao, Xiongjun Li, Zhihui Song, Xianlin Nanchang Univ Ji Luan Acad Nanchang 330031 Jiangxi Peoples R China Nanchang Univ Sch Informat Engn Nanchang 330031 Jiangxi Peoples R China

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Photoacoustic imaging(PAI) is a emerging powerful and efficient imaging technology. optical-resolution photoacoustic microscopy is an useful photoacoustic imaging technique combining the advantages of both optical imaging and acoustic imaging which obtains many attractive advanges such as high resolution, high contrast and so on. Laser beam is often focused strongly to achieve high resolution. However, this will lead to a poor depth-of-field and less structural information which limits the further application of this technology. A image fusion method based on CNN feature extraction is proposed to achieve large volumetric optical-resolution photoacoustic microscopy. First, two groups of simulated 3D photoacoustic data of different focal locations were obtained through photoacoustic microscopic imaging platform. Then B-scan data were fused and maximum projection of the reconstructed 3D data is taken to display the photoacoustic information. By comparing the source images and the fused image, we show that the proposed method can be implemented to obtain large volumetric and high-resolution photoacoustic images.

关键词： photoacoustic microscopy depth expandsion image fusion convolutional neural network

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Modulated DFB-ridge laser diodes at 894 nm for compact Cesium CPT atomic clocks 22

Modulated DFB-ridge laser diodes at 894 nm for compact Cesiu...

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Novel In-Plane Semiconductor Lasers XXII 2023

作者： Krakowski, M. Meghnagi, M. Afuso-Roxo, P. Vinter, B. Duport, F. van Dijk, F. Larrue, A. Theveneau, C. Vinet, E. Robert, Y. Legoec, J.P. Garcia, M. Parillaud, O. Gerard, B. III-V Lab. 1 av. Augustin Fresnel Palaiseau91767 France

ISBN: (纸本)9781510659858

Time & Frequency applications, such as time synchronization of complex networks, are in need of high accuracy and stability clocks. optically pumped Cesium tube atomic clocks satisfy these demands. However, Size, Weight and Power (SWaP) are very important parameters considering easier implementation of atomic clocks in systems. The innovative principal of Coherent Population Trapping (CPT) clocks can meet these challenges. They require a 894nm (Cs D1 line) DFB laser modulated at half the clock frequency (4.6GHz). The modulation generates the side bands separated by 9.2GHz. The laser should also keep a linewidth below 1MHz. We grow the layers of our laser structure two steps Metal Organic Vapor Phase Epitaxy, with an Aluminum free active region. It includes a single GaInAsP compressively strained Quantum Well (QW) and a GaInP waveguide, on GaAs substrates. The use of Al free materials allows for the realization of a buried Bragg grating which induces a very stable single frequency operation as a function of current and temperature. We have investigated our actual 2mm long laser in light current characteristics, optical spectra, linewidth and direct modulation, showing high stability at different temperatures. The Cs D1 line is achieved near room temperature with a very high SMSR (50dB) and a low linewidth ( © 2023 SPIE.

关键词： Semiconductor alloys

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