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Conference on current developments in Lens design and optical engineering XXI

作者： Cote, Geoffroi Lalonde, Jean-Francois Thibault, Simon Univ Laval Ctr Opt Photon & Laser Quebec City PQ G1V 0A6 Canada Univ Laval Lab Vis & Syst Numer Quebec City PQ G1V 0A6 Canada

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

Data-driven approaches to lens design have only recently begun to emerge. One particular way in which machine learning, and more particularly deep learning, was applied to lens design was by smoothly extrapolating from lens design databases to provide high-quality starting points for lens designers. This mechanism is used by the web application LensNet (which will be publicly available shortly) whose goal is to provide high-quality starting points that are tailored to the desired specifications, namely the effective focal length, f-number and half field of view. Here, we evaluate more thoroughly the designs that are inferred by LensNet and its underlying deep neural network. We provide a global quantitative assessment of the viability of the designs as well as a more targeted comparison among specific design families such as Cooke triplets and Double-Gauss lenses between expert-designed lenses and their automatically inferred counterparts.

关键词： Lens design machine learning deep learning lens design optimization

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designing for Degradation: Transient Devices Enabled by (Nano)Cellulose

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ADVANCED MATERIALS 2024年第0期 e2401560页

作者： Andrew, Lucas J. Lizundia, Erlantz MacLachlan, Mark J. Univ British Columbia Dept Chem 2036 Main Mall Vancouver BC V6T 1Z1 Canada Univ Basque Country UPV EHU Fac Engn Bilbao Dept Graph Design & Engn Projects Life Cycle Thinking Grp Bilbao 48013 Spain Basque Ctr Mat Applicat & Nanostruct BCMaterials UPV EHU Sci Pk Leioa 48940 Spain Univ British Columbia Stewart Blusson Quantum Matter Inst 2355 East Mall Vancouver BC V6T 1Z4 Canada Kanazawa Univ WPI Nano Life Sci Inst Kanazawa 9201192 Japan UBC BioProd Inst 2385 East Mall Vancouver BC V6T 1Z4 Canada

Transient technology involves materials and devices that undergo controlled degradation after a reliable operation period. This groundbreaking strategy offers significant advantages over conventional devices based on non-renewable materials by limiting environmental exposure to potentially hazardous components after disposal, and by increasing material circularity. As the most abundant naturally occurring polymer on Earth, cellulose is an attractive material for this purpose. Besides, (nano)celluloses are inherently biodegradable and have competitive mechanical, optical, thermal, and ionic conductivity properties that can be exploited to develop sustainable devices and avoid the end-of-life issues associated with conventional systems. Despite its potential, few efforts have been made to review current advances in cellulose-based transient technology. Therefore, this review catalogs the state-of-the-art developments in transient devices enabled by cellulosic materials. To provide a wide perspective, the various degradation mechanisms involved in cellulosic transient devices are introduced. The advanced capabilities of transient cellulosic systems in sensing, photonics, energy storage, electronics, and biomedicine are also highlighted. current bottlenecks toward successful implementation are discussed, with material circularity and environmental impact metrics at the center. It is believed that this review will serve as a valuable resource for the proliferation of cellulose-based transient technology and its implementation into fully integrated, circular, and environmentally sustainable devices. Recent progress in transient devices enabled by (nano)cellulosic materials is reviewed. Transiency mechanisms, advantages of nanocelluloses, and a suite of applications are discussed. A circular thinking approach coupled with life cycle assessment is applied to critically revisit the potential, advantages, and challenges of nanocellulose-enabled transient devices for future ma

关键词： biodegradable circular economy nanocellulose sustainability transiency

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A Monolithic optical Sensor for IoT Devices Proximity-Detection

A Monolithic Optical Sensor for IoT Devices Proximity-Detect...

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Electrical engineering and Control Science (IC2ECS), International Conference on

作者： Qianfan Ran Xudong Zhang Chaoyang Song Yuan Li Zhihong Lin Patrick Yin Chiang State Key Laboratory of ASIC & System Fudan University Shanghai China

Nowadays, low power consumption is one of the key developments in mobile internet-of-things (IoT) devices proximity-detection. A low power monolithic CMOS optical sensor is presented in this article. The prototype sensor uses an auto-zero and correlated double sampling (CDS) based sample and hold (S/H) stage, which reduces low frequency noise as well as the op-amp DC offset and photodiode (PD) dark current and also serves as a single-ended-to-differential converter. A third-order single-bit delta sigma ADC is implemented to attain high resolution proximity sensing. The optical sensor is fabricated with a 0.18 $\mu$m CMOS process. The die size is 0.7*1.2 mm 2 and the chip scale package dimensions are only $2\times 1\times 0.7$ mm 3 , showing high industrial design flexibility of sensor apertures sizes and shapes. The sensor draws an average current of 200 $\mu$A from a 1.8 V supply during the active state. Tested under a 90% reflectance panel, the measurement results show a proximity distance of 20 mm and a resolution of 0.5 mm, which makes it a practical approach to proximity sensing in IoT devices.

关键词： Reflectivity Sigma-delta modulation Semiconductor device measurement Power demand Shape Prototypes CMOS process

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current scenario in ternary metal indium sulfides-based heterojunctions for photocatalytic energy and environmental applications: A review

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MATERIALS TODAY COMMUNICATIONS 2023年 36卷

作者： Sharma, Pankaj Kumar, Amit Zheng, Gege Mashifana, Tebogo Dhiman, Pooja Sharma, Gaurav Stadler, Florian J. Shoolini Univ Int Res Ctr Nanotechnol Himalayan Sustainabil IRCN Solan 173229 India Shenzhen Univ Coll Mat Sci & Engn Guangdong Res Ctr Interfacial Engn Funct Mat Shenzhen Key Lab Polymer Sci & Technol Shenzhen 518055 Peoples R China Univ Johannesburg Dept Chem Engn POB 17011 ZA-2088 Johannesburg South Africa

The mounting pressure of the energy crisis and environmental pollution has led to unprecedented developments in designing new age materials with superior properties for solar and visible light energy conversion. In light of this, semiconductor photocatalysts have been recognized the most preferred materials for the generation of clean energy and advanced water treatment. With strong visible light absorption, tuneable band width, low toxicity, excellent stability, and a longer lifetime of excited charge-carriers, indium sulphide and ternary metal indium sulphides (MISs) have high potential for applicability in fields of photocatalytic water detoxification, hydrogen evolution, and energy production. To harness the advantages to the fullest and address the inherent drawbacks, numerous metal indium sulphides, nanocomposites, and heterojunctions have been developed in addition to optical and defect engineering and hybridization. In this review, various synthetic routes for improved photo-catalytic performance are discussed, followed by discussions on Z-scheme, S-scheme, and p-n heterojunctions of metal indium sulfides. The most recent advances in the design and utilisation of metal indium sulfide-based heterostructures for photocatalytic applications in environmental contaminants degradation and energy con-version are then summarised. Lastly, some future prospective and future recommendations for photocatalytic activity are discussed. Finally, the challenges, outlook, and research directions for designing superior next-generation MISs-based photocatalysts are discussed.

关键词： Metal indium sulfide Photocatalysis Heterojunctions Water treatment H2 generation

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Promising New Horizons in Medicine: Medical Advancements with Nanocomposite Manufacturing via 3D Printing

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POLYMERS 2023年第20期15卷 4122-4122页

作者： Li, Nan Khan, Sadaf Bashir Chen, Shenggui Aiyiti, Wurikaixi Zhou, Jianping Lu, Bingheng Xinjiang Univ Sch Mech Engn Urumqi 830017 Peoples R China Southwest Univ Sci & Technol Sch Mfg Sci & Engn Key Lab Testing Technol Mfg Proc Minist Educ Mianyang 621010 Peoples R China Dongguan Univ Technol Sch Educ Normal Sch Dongguan 523808 Peoples R China Guangzhou Panyu Polytech Sch Art & Design Guangzhou 511483 Peoples R China

Three-dimensional printing technology has fundamentally revolutionized the product development processes in several industries. Three-dimensional printing enables the creation of tailored prostheses and other medical equipment, anatomical models for surgical planning and training, and even innovative means of directly giving drugs to patients. Polymers and their composites have found broad usage in the healthcare business due to their many beneficial properties. As a result, the application of 3D printing technology in the medical area has transformed the design and manufacturing of medical devices and prosthetics. Polymers and their composites have become attractive materials in this industry because of their unique mechanical, thermal, electrical, and optical qualities. This review article presents a comprehensive analysis of the current state-of-the-art applications of polymer and its composites in the medical field using 3D printing technology. It covers the latest research developments in the design and manufacturing of patient-specific medical devices, prostheses, and anatomical models for surgical planning and training. The article also discusses the use of 3D printing technology for drug delivery systems (DDS) and tissue engineering. Various 3D printing techniques, such as stereolithography, fused deposition modeling (FDM), and selective laser sintering (SLS), are reviewed, along with their benefits and drawbacks. Legal and regulatory issues related to the use of 3D printing technology in the medical field are also addressed. The article concludes with an outlook on the future potential of polymer and its composites in 3D printing technology for the medical field. The research findings indicate that 3D printing technology has enormous potential to revolutionize the development and manufacture of medical devices, leading to improved patient outcomes and better healthcare services.

关键词： tissue engineering nanocomposite drug delivery systems (DDS) medicine 3D printing stereolithography fused deposition modeling (FDM)

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Smartphone-assisted personalized diagnostic devices and wearable sensors

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current OPINION IN BIOMEDICAL engineering 2020年 13卷 42-50页

作者： Purohit, Buddhadev Kumar, Ashutosh Mahato, Kuldeep Chandra, Pranjal Indian Inst Technol Guwahati Dept Biosci & Bioengn Lab Biophysio Sensors & Nanobioengn Gauhati 781039 India

Personalized point-of-care (POC) devices offer an easy access for health monitoring without using sophisticated instruments. Recently, miniaturized biosensors are being widely used as POC devices because of their reliable, sensitive, and fast detection of biomolecules with portable features. The recent advances in the camera and processor of smartphones are being eagerly integrated with biosensing applications, and this can be a big boost for health-care diagnoses owing to their wider presence all over the world. In this review, we have discussed most recent developments of portable diagnostic devices and wearable sensors based on the combined features of smartphones and biosensors for POC applications. optical, electrochemical, and wearable biosensors are discussed in detail, and their sensing mechanism using smartphones has been illustrated. To put perceptive insights into the importance of smartphone-based POC devices and wearable sensing devices, recent examples have been described including the sensor design, transduction mechanism, and smartphone integration.

关键词： Biosensor optical biosensor Electrochemical biosensor Wearable biosensor Point of care Smartphone

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Cascaded Logic Gates Based on High-Performance Ambipolar Dual-Gate WSe2 Thin Film Transistors

arXiv

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arXiv 2023年

作者： Li, Xintong Zhou, Peng Hu, Xuan Rivers, Ethan Watanabe, Kenji Taniguchi, Takashi Akinwande, Deji Friedman, Joseph S. Incorvia, Jean Anne C. Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712 United States Department of Electrical and Computer Engineering The University of Texas at Dallas RichardsonTX75080-3021 United States Research Center for Electronic and Optical Materials National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Research Center for Materials Nanoarchitectonics National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan

Ambipolar dual-gate transistors based on two-dimensional (2D) materials, such as graphene, carbon nanotubes, black phosphorus, and certain transition metal dichalcogenides (TMDs), enable reconfigurable logic circuits with suppressed off-state current. These circuits achieve the same logical output as CMOS with fewer transistors and offer greater flexibility in design. The primary challenge lies in the cascadability and power consumption of these logic gates with static CMOS-like connections. In this article, high-performance ambipolar dual-gate transistors based on tungsten diselenide (WSe2) are fabricated. A high on-off ratio of 108and 106, a low off-state current of 100 to 300 fA, a negligible hysteresis, and an ideal subthreshold swing of 62 and 63 mV/dec are measured in the p- and n-type transport, respectively. For the first time, we demonstrate cascadable and cascaded logic gates using ambipolar TMD transistors with minimal static power consumption, including inverters, XOR, NAND, NOR, and buffers made by cascaded inverters. A thorough study of both the control gate and polarity gate behavior is conducted, which has previously been lacking. The noise margin of the logic gates is measured and analyzed. The large noise margin enables the implementation of VT-drop circuits, a type of logic with reduced transistor number and simplified circuit design. Finally, the speed performance of the VT-drop and other circuits built by dual-gate devices are qualitatively analyzed. This work lays the foundation for future developments in the field of ambipolar dual-gate TMD transistors, showing their potential for low-power, high-speed and more flexible logic circuits. © 2023, CC BY.

关键词： Logic gates

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显微集成术中光学相干断层血流造影术

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中国激光 2022年第15期49卷 119-126页

作者：张子艺俞晨阳乔依琳沈丽君程丹李鹏浙江大学光电科学与工程学院浙江杭州310027 浙江大学嘉兴研究院智能光电创新中心浙江嘉兴324000 温州医科大学附属眼视光医院杭州院区眼底病专科浙江杭州310020

提出一种集成手术显微镜的术中光学相干血流造影系统(iOCTA)来实现术中眼底视网膜血流灌注的动态监测。通过光学相干断层扫描血管造影(OCTA)系统的光路与商用手术显微镜的助手镜的成像光路耦合,实现显微镜-OCTA的系统集成,这种简捷的耦... 详细信息

提出一种集成手术显微镜的术中光学相干血流造影系统(iOCTA)来实现术中眼底视网膜血流灌注的动态监测。通过光学相干断层扫描血管造影(OCTA)系统的光路与商用手术显微镜的助手镜的成像光路耦合,实现显微镜-OCTA的系统集成,这种简捷的耦合方式便于现有手术显微镜的功能升级。采用基于逆信噪比和去相关的光学相干血流运动造影(ID-OCTA)算法,实现高信噪比的眼底微血管成像。利用该系统实现了活体兔眼的术中眼底血流灌注成像,揭示了血流灌注随眼内压的时空动态演变过程,发现急性高眼内压(60 mmHg;1 mmHg=133.32 Pa)将导致血流灌注密度值在短时间内降低至基线值的20%以下。所研制的iOCTA系统有望实现眼科手术中眼底血流灌注的实时监测,有助于外科医生客观评价手术过程和预测术后效果。

关键词：医用光学生物医学成像光学相干层析成像光学相干血流造影术中成像

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Inverse designed flat optics with multilevel diffractive lenses 11

Inverse designed flat optics with multilevel diffractive len...

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Conference on current developments in Lens design and optical engineering XXI

作者： Banerji, Sourangsu Meem, Monjurul Majumder, Apratim Garcia, Juan C. Hon, Philip Pies, Christian Oberbiermann, Timo Menon, Rajesh Rodriguez, Berardi Sensale Univ Utah Elect & Comp Engn Salt Lake City UT 84102 USA Northrop Grumman Corp NG Next Redondo Beach CA 90278 USA Heidelberg Instruments Mikrotech Heidelberg Germany Oblate Opt Inc San Diego CA 92130 USA

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In conventional imaging, the information transfer from the object to the image plane is accomplished either with the help of a traditional lens that performs a one-to-one mapping or an unconventional lens that performs a one-to-many mapping. In the first case, the image is formed directly, whereas in the second case, the image is formed after a computation. The conventional lens approach is preferred in most cases due to the high signal-to-noise ratio achievable at each image pixel. By appealing to the fact that for most of the imaging applications, it is only the intensity, which is measured by the detector, the phase of the field in the image or focal plane is a free parameter, something that comes from the inverse diffraction transform. Therefore, it is easy to visualize that this phase of the plane wave after it transmits the lens can have multiple forms. Hence, the final choice can be made based upon specific application tailored requirements like achromaticity, depth-of-focus, wide-angle imaging, etc. This concept was exploited to design an achromatic MDL via inverse design across almost the entire electromagnetic spectrum (lambda = 450 nm to 15 mu m). Furthermore, a MDL with a Field Of View (FOV) up to 50 degrees for wide-angle imaging as well as a MDL to enable an extreme Depth of Focus (EDOF) imaging of up to 6 m in the NIR were also designed.

关键词： Inverse design Diffractive lens Imaging

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design and pre-development of an airborne multi-species differential absorption Lidar system for water vapor and HDO isotope, carbon dioxide, and methane observation

Design and pre-development of an airborne multi-species diff...

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2020 International Conference on Space Optics, ICSO 2020

作者： Dherbecourt, J.B. Raybaut, M. Melkonian, J.M. Hamperl, J. Santagata, R. Dalin, M. Lebat, V. Godard, A. Flamant, C. Totems, J. Chazette, P. Pasiskevicius, V. Heinecke, D. Schäfer, H. Strotkamp, M. Geus, J.F. Rapp, S. Sodemann, H. Steen-Larsen, H.C. DPHY ONERA Université ParisSaclay PalaiseauF-91123 France UMR 8190 CNRS-SU-UVSQ Paris France UMR 1572 CEA-CNRSUVSQ Gif-sur-Yvette France Roslagstullsbacken 21 Stockholm10691 Sweden SpaceTech GmbH Seelbachstr. 13 Immenstaad88090 Germany Fraunhofer Institute for Laser Technology Steinbachstr. 15 Aachen52074 Germany InnoLas Laser GmbH Justus-von-Liebig- Ring 8 Krailling82152 Germany Geophysical Institute University of Bergen Bjerknes Centre for Climate Research Bergen Norway

We report on the current design and preliminary developments of the airborne Lidar Emitter and Multi-species greenhouse gases Observation iNstrument (LEMON), which is aiming at probing H2O and its isotope HDO at 1982 nm, CO2 at 2051 nm, and potentially CH4 at 2290 nm, with the Differential Absorption Lidar method (DIAL). The infrared emitter is based on the combination of two Nested Cavity OPOs (NesCOPOs) with a single optical parametric amplifier (OPA) line for high-energy pulse generation. This configuration is enabled by the use of high-aperture periodically poled KTP crystals (PPKTP), which provide efficient amplification in the spectral range of interest around 2 μm with slight temperature adjustments. The parametric stages are pumped with a Nd:YAG laser providing 200 mJ nanosecond double pulses at 75 Hz. According to parametric conversion simulations supported by current laboratory experiments, output energies in the 40 - 50 mJ range are expected in the extracted signal beam whilst maintaining a good beam quality (M2 © 2021 ESA and CNES

关键词： Carbon dioxide

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