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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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2D Elastic Organic Crystals with Thermomechanical/Acid Responses and Dual-Mode optical Waveguides

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ADVANCED optical MATERIALS 2024年第21期12卷

作者： Ye, Yang Sun, Ying Zhang, Yaru Ding, Guanchu Hao, Hongxun Zhang, Yating Xie, Chuang Tianjin Univ Sch Chem Engn & Technol Tianjin 300072 Peoples R China Tianjin Univ Sch Precis Instruments & Optoelect Engn Key Lab Optoelect Informat Technol Minist Educ Tianjin 300072 Peoples R China Tianjin Univ Natl Engn Res Ctr Ind Crystallizat Technol Tianjin 300072 Peoples R China

Achieving the combination of multiple external stimuli responses and mechanical flexibility has become the current emerging research in the field of crystalline materials. Meanwhile, the modulation of its properties remains challenging. In this work, a 1-[(E)-[(6-methyl-1,3-benzothiazol-2-yl) imino] methyl] naphthalen-2-ol (BNO) crystalline material is reported. The modulation of the mechanical elasticity and thermomechanical responses is achieved by means of polymorphism (form-I and form-ii). Further, the structural basis of the 2D mechanical properties of form-I is investigated. Meanwhile, two types of thermomechanical responses appearing in form-I are explored in detail from the perspective of crystal structure and thermodynamics, and the second thermomechanical response during cooling is successfully predicted. Then, the acid response of the materials is endowed by molecular design, the fluorescence switch is realized through acid and thermal treatments. Finally, the active/passive dual-mode optical waveguides of the materials are explored. Achieving the combination of multiple external stimuli responses and mechanical flexibility is the emerging research for organic crystalline materials. The modulation of mechanical flexibility, thermomechanical and acid responses through molecular design and crystal engineering are reported. The thermomechanical response behaviors are innovatively analyzed and explored from the perspective of thermodynamics. The potential applications in optoelectronic devices are demonstrated. image

关键词： acid-stimulation response flexible crystals optical waveguides thermomechanical response

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Development of an optically Accessible Mach 3.5 Axisymmetric Direct Connect/Semi-Free Jet Supersonic Combustion Flowpath

Development of an Optically Accessible Mach 3.5 Axisymmetric...

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Lee, Gyu Sub Lim, Jie Gessman, Isabella C. Kato, Nozumo Paganini, Arthur D’Agostino, Mitchell A. Lee, Tonghun Department of Mechanical Science and Engineering University of Illinois Urbana-Champaign UrbanaIL61801 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

An axisymmetric Mach 3.5 direct connect supersonic combustion flowpath has been developed at the University of Illinois Urbana-Champaign for use in fundamental studies on high-speed combustion stabilization, scram and ram combustion performance, and mode transition. The current work outlines the first two iterations of the flowpath design, along with accompanying validation and preliminary measurements conducted in the Arc-Heated Combustion Tunnel (ACT-ii) at Mach 7 total enthalpy conditions with ethylene fueling. These measurements include static pressure measurements on the flowpath wall, pitot measurements at the combustor exit, and optical measurements including OH* and broadband chemiluminescence, isolator plasma luminescence, and OH PLIF of the combustor flowfield. To enhance the diagnostic potential of the flowpath, optical access is featured along 80% of the flowpath length. The earliest prototype of the flowpath exhibited poor combustion and flameholding characteristics, and an inability to engage mode transition. The fault was assessed to be the rapid geometric expansion at the flameholding station of the combustor and an attendant reduction in static pressure, resulting in adverse ignition performance and shortened combustor residence time. Based on these initial results, the flowpath was redesigned with a longer combustor, a deeper flameholding cavity with a 30° takeback ramp, and an additional stage of fuel injection. Early tests of this second flowpath show promising results for both ignition and flameholding performance and demonstrate the capability for mode transition. Pulsed injection-induced ignition was also successfully tested in this new geometry. A semifree jet flowpath was developed based on the revised direct connect model. Mach 4.5 high enthalpy free jet tests of this new geometry were conducted in the ACT-ii. The results confirm full flowpath startability and inlet performance of the unfueled semi-free jet flowpath model. © 2025, American

关键词： Combustors

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Leonardo UK high performance shortwave APDs for astronomy 13

Leonardo UK high performance shortwave APDs for astronomy

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Infrared Sensors, Devices, and Applications XiiI 2023

作者： Baker, Ian Hicks, Matthew Maxey, Chris Owton, Dan Leonardo UK Ltd Southampton HantsSO15 0LG United Kingdom

ISBN: (纸本)9781510665880

The linear-mode, avalanche photodiode array (LmAPD) based on bandgap-engineered HgCdTe, grown by Metal Organic Vapour Phase Epitaxy (MOVPE) is an important product type at Leonardo UK. High-value instruments often employ LmAPDs where the photon count is low and conventional detectors cease to be sensitive. Applications now split into three main categories. Firstly, for applications with intrinsically short integration time, such as: wavefront sensors, fringe trackers and devices for rapid-time-domain astronomy, LmAPDs arrays are established in 320x256 and 515x512 formats, with an avalanche gain of >100x at 15V bias and 80-100K operating temperature. Secondly, for free-space telecoms, LIDAR and gated arrays a GHz version of the LmAPD is available. Thirdly, there is a class of applications with very low photon arrival rates and these provide the most demanding of challenges for LmAPDs. The main field is astronomical imaging and interferometry. In a collaboration with the University of Hawaii (UH) a 1kx1k/15µm device been developed and together with a low dark current version of the LmAPD is under detailed characterisation at UH. Initial results show dark currents below 0.001ph/s/pixel and usable avalanche gain up to 10x. A 2kx2k/15µm format device funded by ESA is currently in trial manufacture. This paper provides an update on the technology and the status of our developments and collaborations. © 2023 SPIE. All rights reserved.

关键词： ii-VI semiconductors

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Physical design level PPA evaluation of buried power rail at 2nm node 2

Physical design level PPA evaluation of buried power rail at...

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DTCO and Computational Patterning ii 2023

作者： Sisto, Giuliano Zografos, Odysseas Weckx, Pieter Hellings, Geert Ryckaert, Julien IMEC Remisebowseg 1 Leuven Belgium

ISBN: (纸本)9781510660977

The backside of the silicon substrate is predicted to be heavily exploited by the next generation of integrated circuits to fulfill the increasingly challenging task of delivering current to billions of transistors. The buried power rail presented in this paper represents an enticing way to start transitioning from the frontside to the backside by moving the power rails in the silicon substrate. This is achieved by leveraging the large portions of Shallow Trench Isolation between fin-based devices. A metal layer is added to a conventional BEOL stack to enable this technology in commercial EDA tools for physical implementation and IR drop analysis. A comprehensive PPA evaluation of the buried power rail is performed at the block level, using a 64-bit CPU block and imec A14 nanosheet PDK. Typical physical design parameters are varied in the process to understand the impact of buried power rail in different conditions. The results show performance improvements both in iso-target (from 2% to 3.5%) and maximum frequency (from 9.5% to 12%). Both stem from a 7% shorter wirelength and 16% smaller area. From the IR drop perspective, better results are obtained with the buried rails showing a reduction up to 33% and enabling the use of sparser power delivery structures. This paper shows how moving the power rails to the substrate represents a powerful block-level knob for power delivery network optimization and as a performance booster. © 2023 SPIE.

关键词： Substrates

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Comparative study of photoconductive and diode MoS2/MoTe2 heterojunction infrared photodetectors 4

Comparative study of photoconductive and diode MoS2/MoTe2 he...

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4th Optics Frontier Conference, OFS 2024

作者： Sheng, Bining Yang, Jiong School of Optoelectronic Science and Engineering Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou215006 China

ISBN: (纸本)9781510682269

When two two-dimensional semiconductor stacks form the type-ii band alignment van der Waals heterojunction, sub-bandgap photoelectric detection can be realized, thus overcoming the intrinsic bandgap limit on the working wavelength of traditional semiconductor detectors. Therefore, photodetectors based on 2D heterostructures have great potentials and advantages in infrared photoelectric detection. High-performance infrared photodetectors based on two-dimensional transition metal chalcogenide heterojunction have been widely reported. However, the current design of two-dimensional heterojunction photodetectors primarily focused on the diode, which has low carrier utilization efficiency and with no extra gain, rendering poor photoresponsivities. In addition, the acquisition of monolayer MoTe2 is difficult, and there are few researches based on monolayer MoTe2 heterojunction devices. This thesis is dedicated to exploring a comparative analysis of photoconductive and diode MoS2/MoTe2 heterojunction infrared photodetectors. By assessing the photoresponse of the photodetectors in both operational modes to the same infrared wavelength, our findings reveal that the photoresponsivity of the two-dimensional heterojunction detector in photoconductive mode reaches 104 nA/W, which is 100 times higher than the diode under the identical conditions. In the photoconductive mode, the inherent photogating effect within the heterojunction engages electrons in the MoS2 layer in multiple photoconductive processes before recombining with holes in the MoTe2 layer, significantly enhancing optical gain and consequently improving responsiveness. The superior detection performance of the two-dimensional heterojunction photodetector in photoconductive mode presents a novel approach to addressing the performance limitations of infrared detectors. © 2024 SPIE.

关键词： Heterojunctions

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A Monolithic optical Sensor for IoT Devices Proximity-Detection 2

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

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2nd International Conference on Electrical engineering and Control Science, IC2ECS 2022

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

ISBN: (纸本)9798350399165

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 m CMOS process. The die size is 0.7∗1.2 mm2 and the chip scale package dimensions are only 0.7 mm3, showing high industrial design flexibility of sensor apertures sizes and shapes. The sensor draws an average current of 200 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. © 2022 IEEE.

关键词： Internet of things

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design of Ultrashort Throw Lenses with Catadioptric Relays for Curved Screens 22

Design of Ultrashort Throw Lenses with Catadioptric Relays f...

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Conference on current developments in Lens design and optical engineering XXii

作者： Nishikawa, Jun Nishiyama, Mariko Sony Grp Corp R&D Ctr Atsugi TEC 4-14-1 Asahi Cho Atsugi Kanagawa 2430014 Japan

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

An ultrashort throw lens with a catadioptric relay (USTCR) for curved screens has a half-field angle greater than 110 degrees. The angle of the principal ray incident on the aspherical mirror increases according to the height of the ray emitted from the object surface. A larger field angle leads to larger sag amount. Thus, the degree of difficulty in precision machining increases. In this study, we examined how the tangent of the concave mirror surface can be reduced such that it can be manufactured while maintaining the half-field angle and its optical performance. It was found that the interval between imaging points reaching the screen can be made constant by suppressing the change in the principal ray incident on the concave mirror by +1- 1 degrees or less, particularly in the area of a half-field angle of 90 degrees or more, and making the change in the tangent of the concave mirror surface constant. As an index of distortion, we show that the perimeter ratio (Pr) of the frame length, which was equally divided by 5 x5 in the screen, improved from 0.26 to 0.73. As one possible application, a projection system that can be realized with only 8 projectors is proposed, as opposed to conventional systems consisting of approximately 20 projectors in omni-directional projection systems.

关键词： ultrashort throw lens aspheric mirror sag amount concave mirror catadioptric relay lens lens design curved screen omni-directional projection system

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design of 1553B Bus Interface Module Based on NIOS ii 7

Design of 1553B Bus Interface Module Based on NIOS II

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7th International Symposium on Advances in Electrical, Electronics, and Computer engineering

作者： Lv, MeiMei Deng, Chao Liu, Shizhe Qiao, Lufeng Jiangsu Automation Research Institute Lianyungang China

ISBN: (纸本)9781510656437

The MIL-STD-1553B bus (1553B for short) is a centralized time-sharing serial bus. Among the current military data buses, the 1553B bus is the most mature and widely used data bus. This paper expounds a design method of 1553B bus communication system with CPCI bus interface. The host system communicates with 1533B interface module through CPCI bus interface. The core structure is FPGA(EP2C35F672I8N), CPCI bus interface bridge chip (PCI9054) and 1553B bus controller (61580), The design, debugging and testing of 1553B bus interface module are realized by using NIOS ii soft core processor. © 2022 SPIE. All rights reserved.

关键词： Field programmable gate arrays (FPGA)

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engineering metalenses for planar optics and acoustics

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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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