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Hybrid Halide Perovskite-Based Near-Infrared Photodetectors and imaging arrays

ADVANCED OPTICAL MATERIALS 2022年第9期10卷

作者： Mei, Luyao Huang, Runfeng Shen, Chaorong Hu, Jianguo Wang, Pu Xu, Zhengji Huang, Zhanfeng Zhu, Lu Sun Yat Sen Univ Guangdong Prov Key Lab Optoelect Informat Proc Ch Sch Microelect Sci & Technol Zhuhai 519082 Peoples R China Sun Yat Sen Univ Sch Microelect Sci & Technol Zhuhai 519082 Peoples R China

Hybrid halide perovskites have been demonstrated to be prospective materials in optoelectronic devices due to their outstanding photoelectric properties and facile manufacturability by low-cost and fast solution-processed methods. Particularly, to meet increasingly potential applications in near-infrared (NIR) detection and imaging, perovskites have been introduced and explored their roles, some of which achieve the comparable performance with traditional silicon counterparts. Here, the recent advancements of hybrid halide perovskite-based NIR photodetectors and imaging arrays in terms of perovskite formation, device structures, working mechanisms, and device performances are reviewed. Pb perovskite-based devices either employ sub-bandgap absorption and intraband transition, or incorporate with narrow-bandgap semiconductors to achieve NIR detection, which could reach the spectral response onset at 2.6 mu m wavelength. Sn perovskite-based devices employ the strategies of template-assisted engineering and reducing additives to inhibit the oxidation of Sn2+ states for efficient detection. Sn-Pb mixed perovskite devices employ compositional engineering, passivation strategies, crystallization tuning, and encapsulation to achieve efficient and long shelf-life photodetectors with an external quantum efficiency of 70% at 940 nm wavelength. Finally, potential prospects are proposed, including spectral response extension, pixel integration, flexible devices, and stability, to advance perovskite-based NIR detection and imaging toward commercial applications.

关键词： hybrid halide perovskites imaging arrays narrow-bandgap materials near-infrared photodetectors Sn--Pb narrow-bandgap perovskites

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Ocean Sensor "imaging" arrays Based on Bio-inspired Architectures and 2-D/3-D Construction

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MARINE TECHNOLOGY SOCIETY JOURNAL 2015年第3期49卷 43-49页

作者： Fries, David P. Starr, Chase A. Barton, Geran W. Univ S Florida Tampa FL 33620 USA

Many common ocean sensor systems measure a localized space above a single sensor element. Single-point measurements give magnitude but not necessarily direction information. Expanding single sensor elements, such as used in salinity sensors, into arrays permits spatial distribution measurements and allows flux visualizations. Furthermore, applying microsystem technology to these macro sensor systems can yield imaging arrays with high-resolution spatial/temporal sensing functions. Extending such high spatial resolution imaging over large areas is a desirable feature for new vision modes on autonomous robotic systems and for deployable ocean sensor systems. The work described here explores the use of printed circuit board (PCB) technology for new sensing concepts and designs. In order to create rigid-conformal, large area imaging camera systems, we have merged flexible PCB substrates with rigid constructions from 3-D printing. This approach merges the 2-D flexible electronics world of printed circuits with the 3-D printed packaging world. Furthermore, employing architectures used by biology as a basis for our imaging systems, we explored naturally and biologically inspired designs, their relationships to visual imagining, and alternate mechanical systems of perception. Through the use of bio-inspiration, a framework is laid out to base further research on design for packaging of ocean sensors and arrays. Using 3-D printed exoskeleton's rigid form with flexible printed circuits, one can create systems that are both rigid and form-fitting with 3-D shape and enable new sensor systems for various ocean sensory applications.

关键词： imaging arrays 3-D bio-architectures spacial/temporal sensing printed skins underwater arrays

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Flexible array curvature and sound speed estimations with a maximum spatial lag-one coherence metric

Flexible array curvature and sound speed estimations with a ...

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Conference on Photons Plus Ultrasound - imaging and Sensing

作者： Zhang, Jiaxin Ding, Kai Bell, Muyinatu A. Lediju Johns Hopkins Univ Dept Elect & Comp Engn Baltimore MD 21218 USA Johns Hopkins Med Dept Radiat Oncol & Mol Radiat Sci Baltimore MD USA Johns Hopkins Univ Dept Biomed Engn Baltimore MD 21218 USA Johns Hopkins Univ Dept Comp Sci Baltimore MD 21218 USA

ISBN: (纸本)9781510669444;9781510669437

Flexible transducer arrays have the potential to conform to various organ shapes and sizes during photoacoustic image-guided interventions. However, incorrect sound speeds and array shapes can interfere with photoacoustic target localization and degrade image quality. We propose a metric to estimate the sound speed surrounding a target and the radii of curvature of flexible arrays with approximately concave shapes. The metric is defined as the maximum lag-one spatial coherence of the time-delayed, zero-mean channel data received from a region of interest surrounding a photoacoustic target (which we abbreviate as mLOC). Performance is demonstrated with simulated and experimental phantom data. Three photoacoustic targets were simulated in k-Wave with 1540 m/s medium sound speed, and photoacoustic signals were received by a transducer with a flat shape and an 81.3 mm radius of curvature. To acquire experimental photoacoustic data with the flexible array placed on flat and curved surfaces, an optical fiber paired with a hollow metal needle was inserted into an 83-mm-radius hemispherical plastisol phantom at three locations. When implementing beamforming time delays to calculate mLOC, the associated sound speed and radii of curvature ranged 1080-2000 m/s and 60-120 mm, respectively. The sound speed and array curvature estimated by the maximized mLOC were 1540 m/s and 81 mm, respectively, in simulation, resulting in accuracies of 100% and 99.63%, respectively. The sound speed in the phantom was empirically estimated by the maximum of mLOC as 1543 m/s, which led to the array curvature estimation of 85 mm and the corresponding accuracy of 97.59%. Results demonstrate the potential of mLOC to approximate sound speeds and array radii when these variables are unknown in future flexible array imaging scenarios.

关键词： Transducers Ultrasonography Data acquisition Optical fibers Spatial coherence Image restoration imaging arrays Ultrasound transducers Photoacoustic imaging

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Compact Multichannel imaging System with Wide FOV and 4x Optical Magnification 8

Compact Multichannel Imaging System with Wide FOV and 4x Opt...

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Conference on Optics, Photonics, and Digital Technologies for imaging Applications VIII

作者： Katopodis, Christos Zergioti, Ioanna Papazoglou, Dimitris G. Natl Tech Univ Athens Dept Phys Iroon Polytehneiou 9 Athens 15780 Greece Fdn Res & Technol Hellas FORTH Inst Elect Struct & Laser Iraklion 71110 Greece Univ Crete Dept Mat Sci & Technol Iraklion 70013 Greece

ISBN: (纸本)9781510673151;9781510673144

A novel multichannel optical imaging system capable of high-resolution imaging across a wide field of view (FOV) of 7x7 mm(2) with a 4x magnification. Comprised by microlens arrays (MLAs) and micro-aperture arrays, our design circumvents the traditional trade-off between resolution and field size. Each channel of the system is optically isolated by micro-aperture arrays acting as field stops, ensuring high-quality imaging without crosstalk. A 5x5 step micro-scanning technique extends the imaging capability to the entire FOV. Experimental validation of the prototype, which employs commercially available MLAs and fabricated micro-aperture arrays, demonstrates agreement with theoretical predictions, achieving clear imaging without the need for a large sensor. This approach promises significant advancements in applications requiring detailed imaging over large areas.

关键词： Multichannel imaging systems imaging systems Design Microlens array Channel projecting optics imaging arrays Image resolution Image segmentation Image visualization Zemax

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HEIFTS 2-Two New Optical Geometries for imaging Fourier Transform Spectrometers 25

HEIFTS 2-Two New Optical Geometries for Imaging Fourier Tran...

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Conference on imaging Spectrometry XXV - Applications, Sensors, and Processing

作者： Horton, Richard F. Ad Hoc Opt Los Lunas NM 87031 USA

ISBN: (纸本)9781510654556;9781510654549

In November 1996, this author presented a SPIE paper on the optical geometry and data reduction scheme for the High Etendue imaging Fourier Transform Spectrometer, (HEIFTS), a totally new imaging spectrometer with no moving parts. Two more papers followed, demonstrating a working device, and in July 1998 a US Patent #5,777,736 was granted. After a general overview of the original device's optical system and spectral data reduction algorithm, two new optical geometries are presented, the first using two apertures and the second using a "split" pupil. Both new lower f/number geometries require only one beamsplitter to form the image plane interferometer and, as in the original, have two separate image data recording planes, allowing two wavelength ranges for one device or a better Signal-To-Noise (SNR) from two arrays in the same band. A very simple high f/number system is proposed which uses only two apertures and two mirrors.

关键词： imaging arrays Mirrors Beam splitters Fourier transforms Image processing Spectrometers Calibration Optical design Spectral data processing Clocks

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Broadening Circular and Linear SAR image and 3D volume parameters for accurate localization 29

Broadening Circular and Linear SAR image and 3D volume param...

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Conference on Algorithms for Synthetic Aperture Radar Imagery XXIX

作者： Pepin, Matthew USAF Albuquerque NM USA

ISBN: (纸本)9781510650671;9781510650664

Determining accurate location with Synthetic Aperture Radar (SAR) images is hindered not only by the limited resolution of the image but also by the non-rectangular nature of the process that produces the image, and the presence of multiple returns from different height objects at the same range. Three dimensional SAR volume measurements can differentiate different height scatterers but imaging methods are limited by the measurement scenario. Interpolation of images and volumes can normalize the collected data but can add inaccuracy to pixel and voxel impulse response (IPR) and localization estimates. Regions of best achievable accuracy define the imaging algorithm performance envelope. Ideal localization occurs at the estimation bound of modeled point scatterers, and is also indicated by pixel and voxel size or IPR main lobe width. The performance envelope of SAR measurement scenarios, radar parameters, and imaging and estimation algorithms can refine system parameters of accurate localization. Use of analogous Circular and Linear SAR (CSAR and LSAR) scenarios enables joint trade-off of flight path along with imaging parameters. An ideal spherical construct underlies joint CSAR and LSAR, two and three dimensional SAR scenarios. This construct also ties CSAR and LSAR imaging to spherical ray-trace creation of phase history. For different scenarios defined through a spherical model of parameters, localization performance of the imaging envelope, IPR and estimation accuracy are examined. Along with sample size and ideal chirp waveform sampling, the azimuth and elevation aperture is varied to include ideal and sub-sampling, and extension to achieve un-aliased images and volumes. Methods expanding the envelope are investigated.

关键词： imaging arrays Synthetic aperture radar 3D modeling 3D image processing Convolution Solid modeling Radar 3D acquisition Image resolution

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ANIMATE: Wearable, Flexible, and Ultra-Lightweight High-Density Diffuse Optical Tomography Technologies for Functional Neuroimaging of Newborns 8

ANIMATE: Wearable, Flexible, and Ultra-Lightweight High-Dens...

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European Conferences on Biomedical Optics - Diffuse Optical Spectroscopy and imaging VIII

作者： Zhao, Hubin Frijia, Elisabetta Maria Rosas, Ernesto Vidal Collins-Jones, Liam Smith, Greg Nixon-Hill, Reuben Powell, Samuel Everdell, Nicholas L. Cooper, Robert J. UCL Dept Med Phys & Biomed Engn DOT HUB BORL London WC1E 6BT England Univ Glasgow James Watt Sch Engn Glasgow G12 8QQ Lanark Scotland Gowerlabs Ltd London England Imperial Coll London Dept Math London SW7 2BU England Univ Nottingham Dept Elect & Elect Engn Nottingham NG7 2RD England

We have developed a series of wearable high-density diffuse optical tomography (HD-DOT) technologies specifically for neonatal applications. These systems provide an ultra-lightweight form factor, a low profile and hi... 详细信息

ISBN: (数字)9781510647077

ISBN: (纸本)9781510647077;9781510647060

关键词： Neuroimaging Diffuse optical tomography Connectors imaging arrays Sensors Absorbance imaging systems Light emitting diodes Mechanical engineering Traumatic brain injury

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Special Section Guest Editorial: Autonomous Vehicles

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OPTICAL ENGINEERING 2023年第3期62卷 031201-031201页

作者： McManamon, Paul Piracha, Umar Jameson, Steve Bos, Jeremy Stead, Robert Exciting Technol LLC Dayton OH 45424 USA Mot AD Inc Pittsburgh PA USA BAE Syst Intelligence & Secur Mclean VA USA Michigan Technol Univ Dept Elect & Comp Engn Houghton MI 49931 USA Broadbridge Heath Sense Media Grp Chichester England

Guest editors Paul McManamon, Umar Piracha, Steve Jameson, Jeremy Bos, and Robert Stead introduce the Special Section on Autonomous Vehicles.

关键词： Unmanned vehicles LIDAR Sensors Defense and security imaging arrays Intelligence systems Optical engineering Robotics Standards development Thermography

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Elimination of Interfacial-Electrochemical-Reaction-Induced Polarization in Perovskite Single Crystals for Ultrasensitive and Stable X-Ray Detector arrays

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ADVANCED MATERIALS 2021年第52期33卷 2103078-2103078页

作者： Song, Yilong Li, Liqi Hao, Mingwei Bi, Weihui Wang, Anran Kang, Yifei Li, Hanming Li, Xiaohui Fang, Yanjun Yang, Deren Dong, Qingfeng Jilin Univ Coll Chem State Key Lab Supramol Struct & Mat Changchun 130012 Peoples R China Zhejiang Univ State Key Lab Silicon Mat Hangzhou 310027 Peoples R China Zhejiang Univ Sch Mat Sci & Engn Hangzhou 310027 Peoples R China

Organic-inorganic halide perovskites have exhibited bright prospects in high-sensitivity X-ray detection. However, they generally suffer from the severe field-driven polarization issue that remarkably deteriorates the detection performance. Here, it is demonstrated that the interfacial electrochemical reaction between Au electrodes and halogen in MAPbI(3) single crystals (SCs) is the major source of the dark current polarization in the metal-semiconductor-metal (MSM)-structured perovskite X-ray detectors at the initial stage of biasing. By introducing the p- and n-type charge transport layers to isolate the electrodes from contacting the SC surface, the polarization is fully eliminated under a large electric field up to 1000 V cm(-1). Moreover, the resultant lateral p-i-n heterojunction suppresses the dark current of the devices by nearly 3 orders of magnitude as compared to the MSM counterparts and therefore enables a high sensitivity of 5.2 x 10(6) mu C Gy(air)(-1) cm(-2) and a record low X-ray detection limit down to 0.1 nGy(air) s(-1). The excellent biasing stability and sensitivity of the devices allow to prepare the linear detector arrays for X-ray imaging applications.

关键词： imaging arrays interfacial electrochemical reaction perovskite single crystals X-ray detectors

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Astronomical Applications of Multi-Core Fiber Technology

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IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 2020年第4期26卷 1页

作者： Jovanovic, Nemanja Harris, Robert J. Cvetojevic, Nick CALTECH Pasadena CA 91125 USA Heidelberg Univ Zentrum Astron Landessternwarte LSW D-69117 Heidelberg Germany Univ Cote Azur Lab Lagrange Observ Cote Azur F-06304 Nice France

Optical fibers have altered astronomical instrument design by allowing for a complex, often large instrument to be mounted in a remote and stable location with respect to the telescope. The fibers also enable the possibility to rearrange the signal from a focal plane to form a psuedo-slit at the entrance to a spectrograph, optimizing the detector usage and enabling the study of hundreds of thousands of stars or galaxies simultaneously. Multi-core fibers in particular offer several favorable properties with respect to traditional fibers: 1) the separation between single-mode cores is greatly reduced and highly regular with respect to free standing fibers, 2) they offer a monolithic package with multi-fiber capabilities and 3) they operate at the diffraction limit. These properties have enabled the realization of single component photonic lanterns, highly simplified fiber Bragg gratings, and advanced fiber mode scramblers. In addition, the precise grid of cores has enabled the design of efficient single-mode fiber integral field units for spectroscopy. In this article, we provide an overview of the broad range of applications enabled by multi-core fiber technology in astronomy and outline future areas of development.

关键词： Telescopes Fiber gratings Spectroscopy Multicore processing Photonics Multi-core fibers integral field units imaging arrays single mode fibers astronomical spectroscopy

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