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engineering metalenses for planar optics and acoustics

MATERIALS TODAY PHYSICS 2023年 39卷

作者： Oh, Beomseok Kim, Kyungtae Lee, Dongwoo Rho, Junsuk Pohang Univ Sci & Technol POSTECH Dept Mech Engn Pohang 37673 South Korea Pohang Univ Sci & Technol POSTECH Dept Chem Engn Pohang 37673 South Korea POSCO POSTECH RIST Convergence Res Ctr Flat Opt & Pohang 37673 South Korea

Metalens, a two-dimensional planar system composed of strategically engineered subwavelength structures, facilitates precise manipulation in the process of both light and sound. Benefiting from the synergy between theoretical exploration and cutting-edge fabrication in the past decade, metalenses have attracted considerable attention owing to their thin structure and large number of degrees of freedom. Herein, we comprehensively review recent developments in optical and acoustic metalenses. Initially, we provide an overview of the fundamental principles and design perspectives of metalenses. Subsequently, we discuss the current challenges affecting planar optical and acoustic technologies. Then, we introduce emerging applications that leverage the capabilities of metalenses. Finally, we summarize this review with a discussion of various perspectives to guide future works.

关键词： Metasurface Metalens optical metalens Acoustic metalens Imaging system

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Smart organic crystalline materials based on photo-induced topochemistry

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Moore and More 2024年第1期1卷 1-26页

作者： Song, Yuhui Zhang, Xiaomin Ning, Lijian Zhou, Qian Feng, Jinkun Wang, Yanli Gong, Qiuyu Huang, Yinjuan State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft Matter School of Materials Science and Engineering Xi’an Jiaotong University Xi’an China Department of Thoracic Surgery The First Affiliated Hospital of Xi’an Jiaotong University Xi’an China

Presponsive smart organic crystalline materials (SOCMs) have emerged as an attractive research topic because of their many advantages, such as well-defined structures, high structural order, and the resulting fast response speeds, as well as high energy conversion efficiency and remarkable dynamic optical/electronic changes or mechanical responses. In this review, we discuss the recent developments in SOCMs based on topochemistry beyond coordination compounds, which include [2 + 2] or [4 + 4] photocycloaddition of anthracene and olefin derivatives as well as 1, 4-addition-polymerization of diacetylenes. The detailed design principles and mechanisms associated with smart behavior, photoresponsive physical and chemical properties (i.e., photochromism, photo fluorochromism, and photodeformation), and structure–property relationships are discussed, along with their advanced applications in exciting fields such as intelligent microrobots, encryption, sensors, photoactuators, data storage, and displays. Finally, we summarize the current developments and discuss the major current challenges and future opportunities in this field. We expect that this review will inspire more innovative research into the development of advanced photoresponsive organic smart crystal materials with fast, accurate, and reversible responses, and promote the further development of smart materials and devices.

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集成微腔光梳色散调控技术研究进展(特邀)

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激光与光电子学进展 2024年第19期61卷 1-13页

作者：沈碧涛常华墐舒浩文王兴军北京大学电子学院区域光纤通信网与新型光通信系统国家重点实验室北京100871 北京大学教育部纳光电子前沿科学中心北京100871

集成微腔光梳技术,利用集成微腔内的光学非线性作用可在连续光泵浦下产生周期性光脉冲,其在频域上表现为等间隔的光学频率成分。与传统光梳相比,集成微腔光梳具有小型化、功耗低、重复频率大等优势,其独特的时频特性在推动传统光梳向片... 详细信息

集成微腔光梳技术,利用集成微腔内的光学非线性作用可在连续光泵浦下产生周期性光脉冲,其在频域上表现为等间隔的光学频率成分。与传统光梳相比,集成微腔光梳具有小型化、功耗低、重复频率大等优势,其独特的时频特性在推动传统光梳向片上化演进的同时,也可与波分复用技术结合,推动了片上集成并行化、大容量的信息传输、处理与感知。在微腔光梳的产生过程中,微腔的色散,即不同波长的光在腔内的群速度差异特性,具有决定性作用。面对不同的应用需求,不同的腔体色散设计至关重要。本文首先介绍了色散对光梳状态影响的研究进展,然后介绍了近年来集成微腔色散设计方面取得的进展,最后对当前的技术与问题进行总结,并对未来的发展进行展望。

关键词：集成光学光频梳集成微腔光梳色散

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Exploring Quasi-Global Solutions to Compound Lens Based Computational Imaging Systems

arXiv

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arXiv 2024年

作者： Gao, Yao Jiang, Qi Gao, Shaohua Sun, Lei Yang, Kailun Wang, Kaiwei State Key Laboratory of Extreme Photonics and Instrumentation Zhejiang University Hangzhou310027 China School of Robotics Hunan University Changsha410012 China National Engineering Research Center of Robot Visual Perception and Control Technology Hunan University Changsha410082 China

Recently, joint design approaches that simultaneously optimize optical systems and downstream algorithms through data-driven learning have demonstrated superior performance over traditional separate design approaches. However, current joint design approaches heavily rely on the manual identification of initial lenses, posing challenges and limitations, particularly for compound lens systems with multiple potential starting points. In this work, we present Quasi-Global Search Optics (QGSO) to automatically design compound lens based computational imaging systems through two parts: (i) Fused Optimization Method for Automatic optical design (OptiFusion), which searches for diverse initial optical systems under certain design specifications;and (ii) Efficient Physic-aware Joint Optimization (EPJO), which conducts parallel joint optimization of initial optical systems and image reconstruction networks with the consideration of physical constraints, culminating in the selection of the optimal solution in all search results. Extensive experimental results illustrate that QGSO serves as a transformative end-to-end lens design paradigm for superior global search ability, which automatically provides compound lens based computational imaging systems with higher imaging quality compared to existing paradigms. The source code will be made publicly available at https://***/LiGpy/QGSO. Copyright © 2024, The Authors. All rights reserved.

关键词： Imaging systems

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STATUS OF AEOLUS-2 MISSION PRE-DEVELOPMENT ACTIVITIES

STATUS OF AEOLUS-2 MISSION PRE-DEVELOPMENT ACTIVITIES

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2022 International Conference on Space Optics, ICSO 2022

作者： Heliere, Arnaud Wernham, Denny Mason, Graeme Fehr, Thorsten De Villele, Geraud Corselle, Bertrand Lecrenier, Olivier Belhadj, Thomas Bravetti, Paolo Arnaud, Sylvain Bon, Didier Lingot, Philippe Foulon, Roland Marchais, Denis Olivier, Mickael D'Ottavi, Alessandro Verzegnassi, Fulvia Mondello, Alessia Coppola, Francesco Landi, Guglielmo Hoffmann, Hans-Dieter Esser, Dominik Prieto, Lucia Perez Wührer, Christian Rivers, Christopher European Space Agency Airbus Defence and Space SAS Germany Leonardo Spa Germany Airbus Defence and Space Gmbh Germany Ray Bell Teledyne E2V

ISBN: (纸本)9781510668034

The European Space Agency's (ESA) Aeolus satellite was launched on 22 August 2018 from Centre Spatial Guyanais in Kourou, French Guyana. The Aeolus data has been extensively analysed by a number of meteorological centres and found to have a positive impact on NWP forecasts, particularly in the tropics and polar regions. These positive results, along with the successful in-orbit demonstration of the measurement concept and associated technologies utilised on Aeolus, resulted in a statement of interest from EUMETSAT in a future, operational DWL mission in the 2030 to mid-2040's timeframe and a request to ESA to carry out the necessary pre-development activities for such a mission. This paper will describe the current status of instrument predevelopment activities that are being performed in the frame of a potential Aeolus-2 mission. The main inputs for a future Doppler Wind Lidar (DWL) instrument that have been used are: lessons learned from the Aeolus development phases and the in-orbit operations and performance;initial inputs from EUMETSAT including a total mission lifetime of higher than 10-15 years utilizing 2 spacecraft (implying a lifetime of 5.5 years for each) with a launch of the first satellite in 2030, increased robustness and operability of the instrument, and an emphasis on reduction of recurrent costs;the maximum utilization of the demonstrated design heritage;and a number of recommendations for the requirements of a future DWL mission from the Aeolus Scientific Advisory Group (ASAG). These inputs have been collated and combined into a set of preliminary requirements which have been used as the basis for a dedicated Instrument Consolidation Study. An extensive review and trade-off of the above inputs by Airbus Defence & Space, ESA, and independent experts, resulted in the decision to baseline a bi-static instrument design. In addition, three instrument subsystem pre-development activities are currently running: two laser transmitter pre-developments and

关键词： optical radar

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Nanotechnology-enabled biomedical engineering: current trends, future scopes, and perspectives

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NANOTECHNOLOGY REVIEWS 2021年第1期10卷 728-743页

作者： Ray, Shariqsrijon Sinha Bandyopadhyay, Jayita CSIR DSI CSIR Nanotechnol Innovat Ctr Ctr Nanostruct & Adv Mat ZA-0001 Pretoria South Africa St Albans Coll 110 Clearwater Rd ZA-0081 Pretoria South Africa

Applications of nanotechnology in biomedical engineering are vast and span several interdisciplinary areas of nanomedicine, diagnostics, and nanotheranos-tics. Herein, we provide a brief perspective on nanotech-nology as an enabling tool for the design of new func-tional materials and devices for medical applications. Semiconductor nanocrystals, also known as quantum dots, are commonly used in optical imaging to diagnose diseases such as cancer. Varieties of metal and metal oxide nanoparticles, and two-dimensional carbon-based nanostructures, are prospective therapeutics and may also be used in protective antiviral/antibacterial applica-tions. Similarly, a number of nanomaterials have shown the potential to overcome the drawbacks of conventional antiviral drugs. However, assessing the adverse effects and toxicities of nanoparticles in medicine and therapeutics is becoming more critical. This article discusses the latest developments of nanomaterials in diagnosis, nanothera-nostics, and nanomedicines, with particular emphasis on the importance of nanomaterials in fighting against corona-virus disease. Further, we considered the safety and toxicity of nanomaterials in the context of biomedical applications. Finally, we provided our perspective on the future of nano-technology in emerging biomedical engineering fields. Graphical

关键词： nanotechnology biomedical engineering nano-medicine trends scopes and perspectives

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Electro-optical Phase Locked Loop design for FMCW LiDAR TX in 28-nm CMOS

Electro-Optical Phase Locked Loop design for FMCW LiDAR TX i...

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International SoC design Conference, ISOCC

作者： Euigeun Kim Jinwook Burm Dept. of Electronic Engineering Sogang University Seoul Korea

This Paper presents the Electro-optical Phase Locked Loop(EOPLL) design process to stably drive distributed Bragg Reflector(DBR) Laser Diode in the Frequency-Modulated Continuous Wave Light Detection and Ranging(FMCW LiDAR) System. The optical Circuit performs a function of Mach-Zehnder interferometer. I model the mathematical function of this optical circuit based on the extracted parameters by using Verilog-A and apply a loop filter design method of Type ii PLL. Through Post-Simulatoin, it is confirmed that the PLL locks and the output frequency of the Laser is modulated linearly. It is designed by FD-SOI 28nm CMOS Process, and the gain current of the Laser Diode is 50mA. Polarization Maintaining Fiber (PM Fiber) is used for high SNR.

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design of Broadband Microwave Metamaterial Absorber using Surrogate-based Constrained Dual-objective Optimization 15

Design of Broadband Microwave Metamaterial Absorber using Su...

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15th International Conference on Microwave and Millimeter Wave Technology, ICMMT 2023

作者： Liu, Sixing Zhang, Shumin Ye, Xiaodong Wang, Hao Tao, Shifei Nanjing University of Science & Technology School of Electronic and Optical Engineering Nanjing210000 China

ISBN: (纸本)9798350338874

Optimization of a broadband metamaterial absorber usually adopts evolutionary algorithms, which require many objective function evaluations. To remedy this issue, a dual-objective surrogate-based constrained optimization algorithm is proposed to increase the absorption bandwidth and reduce the thickness of the absorber. To decrease the number of expensive evaluations, Kriging models are used to approximate objective functions. Then, a dual-objective expected improvement infill sampling criterion and probability of feasibility sampling criterion are considered to find current optimal solution and update the surrogate model. The optimal trade-off is obtained by Pareto front technique. The proposed algorithm is compared with a well-known multi-objective evolutionary algorithm NSGA-ii to verify its feasibility and efficiency. Finally, a broadband metamaterial absorber is optimized with the absorption bandwidth from 9.77GHz to 32.21GHz and the thickness of 2.93mm. © 2023 IEEE.

关键词： Bandwidth

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Evolution in blood glucose monitoring: a comprehensive review of invasive to non-invasive devices and sensors

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Discover Medicine 2025年第1期2卷 1-40页

作者： Ghosh, Manthan Bora, Vibha Rajesh Electronics Engineering G H Raisoni College of Engineering Nagpur India

The prevalence of diabetes is rising every year, and the present ways of keeping track of blood glucose levels are intrusive, costly, and painful. The study presents a comprehensive analysis of developments in glucose monitoring devices focusing on the topic of diabetes. This study shows the usefulness of Continuous Glucose Monitoring (CGM) in the management of diabetes, which is again a strong reason for preferring Non-invasive(NI) measurements over the more conventional but less comfortable invasive ones. For glucose monitoring, the study incessantly characterizes the current and developing technologies between invasive, minimally, and noninvasive technologies as well as providing an overview of the advancement, existing, and used commercial applications for each category. The systematic review involved browsing databases such as the ACM Digital Library, Elsevier Library, WOS, and IEEE, whereby after going through 320 related papers the study highlighted 41 quality papers. The application of Non-Invasive Blood Glucose Monitoring (NIBGM) technologies such as optical, microwave, and nano-based sensors are representative of an effective way to improve diabetes care due to their painless and continuous characteristics. In addition, the current research has given a details discussion of innovations such as smart wearables, breath analyzers, and saliva-based sensors that have been introduced recently in the market and explore future research areas that may improve the accuracy, selectivity, and sensitivity of the NIBGM devices. This work is special since the International Diabetes Federation estimates three hundred and twenty-two million people living with type ii diabetes, and it leads to 1. 5 million deaths annually. Despite the standard single-CGM systems’ excellent accuracy, the findings indicate that combining them with numerous NI techniques could lead to a better, more dependable, and more affordable solution. This, in turn, would improve patient compliance and q

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current developments in Lens design and optical engineering XX

Current Developments in Lens Design and Optical Engineering ...

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current developments in Lens design and optical engineering XX 2019

ISBN: (纸本)9781510629011

The proceedings contain 29 papers. The topics discussed include: fundus camera versus smartphone camera attachment: image quality analysis;a water-polydimethylsiloxane liquid lens for variable focus experiments in an undergraduate laboratory;deconvolution process with GPU in a wavefront coding microscopy system;exposure of restore-L camera optical elements to a simulated orbital radiation environment;the design of a four-mirror anti-astigmatism astronomical telescope;introducing a dynamic deep neural network to infer lens design starting points;and application of GPUs in optical design software.

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