- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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8.3: <i>Invited Paper:</i> Ultra High Resolution Display for Digital Holography
摘要： Ultra high resolution display panels are one of the technical trends for future display and essential for the realization of digital hologram. Two approaches for the development toward 1um pixel pitch are introduced. SLM panel with 3μm pixel pitch based on reflected TFT-LCD was fabricated. Reconstructed hologram images were successfully demonstrated. SLM based on phase change materials was under development. In this case the driving circuitry was consist of Si CMOS backplane. Due to the scalability of PCM materials, accomplishment of pixel pitch with 1μm is very promising.
关键词： TFT-LCD,Spatial Light Modulator,Ultra high resolution,Holography,Phase modulation,Active-matrix displays,TFTs,Phase Change Materials
更新于2025-09-12 10:27:22
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Advanced material system for the design of an intermediate band solar cell: Type-II CdTe quantum dots in a ZnCdSe matrix
摘要： We explore CdTe fractional monolayer quantum dots (QDs) in a ZnCdSe host matrix for potential application in an intermediate band solar cell device. Careful consideration has been taken during the initiation of the growth process of QDs by migration enhanced epitaxy, in order to avoid the formation of undesirable interfacial layers that can form due to the lack of common anion between the two materials. A superlattice structure of 100 periods of alternating QD and spacer layers is analyzed by high-resolution X-ray diffraction (XRD) and photoluminescent (PL) spectroscopy. Simple arguments are used following continuum elastic theory to deduce the size of the dots and the strain within the superlattice from XRD data. This is further verified using PL and used in the energy calculations that yield the values of the intermediate band energy. The results suggest that the optimized materials are highly suitable for these high efficiency solar cells.
关键词： migration enhanced epitaxy,ZnCdSe,CdTe,quantum dots,photoluminescent spectroscopy,intermediate band solar cell,high-resolution X-ray diffraction
更新于2025-09-12 10:27:22
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Strategy toward ultra-high-resolution micro-LED displays by bonding interface-engineered vertical stacking and surface passivation
摘要： In this paper, we have proposed the strategy to fulfill the vertically stacked subpixel (VSS) micro-light-emitting diodes (μ-LEDs) for future ultra-high resolution microdisplays. At first, to vertically stack the LED with different colors, we have successfully adopted the bonding interface engineered monolithic integration method by using SiO2/SiNx distributed Bragg reflectors (DBRs). It was found that an intermediate DBR structure can be performed as the bonding layer and the color filter, which can reflect and transmit desired wavelengths the bonding interface. Furthermore, the optically pumped μ-LEDs array with 0.4 μm pitch corresponding to ultra-high-resolution of 63500 PPI was successfully fabricated by using typical semiconductor processing, including electron-beam lithography. Compared with pick-and-place with the limitation of the machine alignment accuracy, there is a significant improvement for fabricating the high-density μ-LEDs. Finally, we have systematically investigated the effects of surface traps by using time-resolved photoluminescence (TRPL) and two-dimensional simulation. These results clearly demonstrated that performance improvements could be possible by employing the optimal passivation techniques according to diminishing the pixel size for low power and highly-efficient microdisplays.
关键词： ultra-high-resolution,micro-LEDs,wafer bonding,distributed Bragg reflectors,surface passivation
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE International Conference on Image Processing (ICIP) - Taipei, Taiwan (2019.9.22-2019.9.25)] 2019 IEEE International Conference on Image Processing (ICIP) - Prior Knowledge Guided Small Object Detection on High-Resolution Images
摘要： When applying common object detection algorithms to detect small objects on high-resolution images, the down-sampling operation of the input images is inevitable due to the limitation of GPU memory. Accordingly, the details for characterizing small objects are lost. To resolve this contradiction, a small object detection method in a coarse-to-fine manner is presented. Specifically, some rough regions of interest (ROI) are firstly computed from low-resolution images. The prior knowledge of the positions of objects is used to guide the generation of ROIs. Then the features of small ROIs are recomputed from high-resolution images, and the features of large ROIs are obtained from the feature maps used to generate ROIs. The proposed method is validated on two datasets. One is a plant phenotyping dataset and the other is a public traffic sign dataset. Experimental results convincingly show the effectiveness of the proposed method.
关键词： prior knowledge,convolutional neural network,high-resolution image,small object detection
更新于2025-09-11 14:15:04
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Computational High-Resolution Dual-Comb Spectroscopy with a Free-Running All-Fiber Laser
摘要： Dual-comb spectroscopy (DCS) has experienced a remarkable growth propelled by recent advances in fiber and semiconductor technology. A key enabler for DCS is mutual stability between two repetition-rate-mismatched frequency combs, which conventionally relies on feedback loops employing additional optics and electronics to synchronize a pair of sources. This limitation can be overcome in several ways, of which one of the most promising is the generation of two frequency combs in a single free-running fiber laser cavity [1–3]. To date, however, the only configuration proven to be compatible with Doppler-limited spectroscopy was the dual-color laser presented in Ref. [2] requiring external spectral broadening, thus adding an extra layer of complexity. Here, we report on the realization of a drastically simplified all-fiber dual-comb laser (AFDCL) with an unprecedentedly low number of components and battery-operation-compatible electrical power consumption (0.35 W) with excellent suitability for spectroscopy of Doppler-limited transitions (Fig. 1). A key feature of our solution relying on polarization-multiplexing [3] is that the laser cavity has an easily adjustable repetition rate difference ranging from sub-kHz to dozens of kHz obtained by varying the intracavity polarization state using polarization controllers (PC) and/or the length of the polarization maintaining fiber in the cavity, which is not possible in the dual-color or bidirectional schemes. Furthermore, we achieve uninterrupted operation times of dozens of hours, and a record-high repetition rate for an AFDCL exceeding 140 MHz to maximize the optical power per comb tooth. High-resolution molecular dual-comb spectroscopy in free-running mode is made possible thanks to a novel real-time compatible phase correction algorithm that marks a radical departure from the cross-correlation or cross-ambiguity function paradigm, hence considerably lowering the complexity of such procedures. As a demonstration, we measure P18-P27 lines of the 2ν3 band of H13C14N at 10 Torr with FWHM Doppler line widths of ~450 MHz within 200 ms (Fig. 1b,c) with better than 1% of precision in a 1 THz bandwidth.
关键词： high-resolution,free-running,molecular spectroscopy,Dual-comb spectroscopy,all-fiber laser
更新于2025-09-11 14:15:04
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Spatial–Spectral Feature Fusion Coupled with Multi-Scale Segmentation Voting Decision for Detecting Land Cover Change with VHR Remote Sensing Images
摘要： In this article, a novel approach for land cover change detection (LCCD) using very high resolution (VHR) remote sensing images based on spatial–spectral feature fusion and multi-scale segmentation voting decision is proposed. Unlike other traditional methods that have used a single feature without post-processing on a raw detection map, the proposed approach uses spatial–spectral features and post-processing strategies to improve detecting accuracies and performance. Our proposed approach involved two stages. First, we explored the spatial features of the VHR remote sensing image to complement the insu?ciency of the spectral feature, and then fused the spatial–spectral features with di?erent strategies. Next, the Manhattan distance between the corresponding spatial–spectral feature vectors of the bi-temporal images was employed to measure the change magnitude between the bi-temporal images and generate a change magnitude image (CMI). Second, the use of the Otsu binary threshold algorithm was proposed to divide the CMI into a binary change detection map (BCDM) and a multi-scale segmentation voting decision algorithm to fuse the initial BCDMs as the ?nal change detection map was proposed. Experiments were carried out on three pairs of bi-temporal remote sensing images with VHR remote sensing images. The results were compared with those of the state-of-the-art methods including four popular contextual-based LCCD methods and three post-processing LCCD methods. Experimental comparisons demonstrated that the proposed approach had an advantage over other state-of-the-art techniques in terms of detection accuracies and performance.
关键词： very high resolution,spatial–spectral features,bi-temporal remote sensing images,land cover change detection,multi-scale segmentation
更新于2025-09-11 14:15:04
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High Resolution Photoelectron Spectroscopy of Cryogenically-Cooled NO <sub/>3</sub> ˉ
摘要： High-resolution anion photoelectron spectra of cryogenically cooled NO3ˉ anions obtained using slow photoelectron velocity-map imaging are presented and provide new insight into the vibronic structure of the corresponding neutral radical. A combination of improved spectral resolution, measurement of energy-dependent intensity effects, temperature control, and comparison to theory allows for full assignment of the vibronic features observed in this spectrum. We obtain a refined electron affinity of 3.9289(14) eV for NO3. Further, the appearance of Franck-Condon forbidden transitions from vibrationally cold anions to neutral states with excitation along the NO3 v4 mode confirms that these features arise from vibronic coupling with the ? 2 B E excited state of NO3 and are not hot bands as has been suggested. Together, the suite of experimental and simulated results provides clear evidence that the v3 fundamental of NO3 resides near 1050 cm?1, addressing a long-standing controversy surrounding this vibrational assignment.
关键词： vibronic structure,High-resolution photoelectron spectroscopy,NO3ˉ anions,electron affinity,vibronic coupling
更新于2025-09-11 14:15:04
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High‐Resolution Inkjet Printing of Quantum Dot Light‐Emitting Microdiode Arrays
摘要： The direct printing of microscale quantum dot light-emitting diodes (QLEDs) is a cost-effective alternative to the placement of pre-formed LEDs. The quality of printed QLEDs currently is limited by nonuniformities in droplet formation, wetting, and drying during inkjet printing. Here, optimal ink formulation which can suppress nonuniformities at the pixel and array levels is demonstrated. A solvent mixture is used to tune the ejected droplet size, ensure wetting, and provoke Marangoni flows that prevent coffee stain rings. Arrays of green QLED devices are printed at a resolution of 500 pixels in.?1 with a maximum luminance of ≈3000 cd m?2 and a peak current efficiency of 2.8 cd A?1. The resulting array quality is sufficient to print displays at state-of-the-art resolutions.
关键词： light-emitting diodes,quantum dots,uniform pixel arrays,inkjet printing,high resolution
更新于2025-09-11 14:15:04
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3.1: <i>Invited Paper:</i> OLED Micro‐displays for VR/AR Applications
摘要： OLED Micro-displays with single crystal silicon (CMOS) backplane for VR and AR applications will be discussed. An overview of the OLED micro-display market size and requirements followed by the fabrication process, as it exists today, will be first discussed. The requirement of high brightness micro-displays for both VR and AR applications will be discussed. Recent development of a high brightness (greater than 7,000 cd/m2) full color 1920x1200 and 2Kx2K resolution OLED micro-displays at eMagin Corporation will be discussed. The performance details of this high resolution high brightness OLED micro-display will be presented.
关键词： high resolution,virtual reality,AMOLED,microdisplay,head-mounted display,augmented reality,OLED
更新于2025-09-11 14:15:04
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[IEEE 2018 7th International Conference on Agro-geoinformatics (Agro-geoinformatics) - Hangzhou (2018.8.6-2018.8.9)] 2018 7th International Conference on Agro-geoinformatics (Agro-geoinformatics) - Deep Extraction of Cropland Parcels from Very High-Resolution Remotely Sensed Imagery
摘要： Extracting cropland parcels from high resolution remote sensing images is a basic task for precision agriculture and other fields. Object based image analysis rely heavily on segmentation methods and can't satisfy the parcels' requisition in most situation. Inspired by the recent remarkable improvement on image understanding with deep learning, we propose a deep-edge guided method for cropland parcels extraction. Focus on the boundaries of these parcels, hard edge and soft edge are extracted respectively with U-Net and RCF model. Then all edges with the land type of cropland are constructed into parcels. At last accurate cropland-parcels are achieved.
关键词： cropland parcels,deep learning,high-resolution remote sensing,semantic segmentation
更新于2025-09-11 14:15:04