A5100396834- Advanced Optical Imaging Technologies
- Digital Holography and Microscopy
- Photorefractive and Nonlinear Optics
- Advanced Fluorescence Microscopy Techniques
- Chaos-based Image/Signal Encryption
- Virtual Reality Applications and Impacts
- Metamaterials and Metasurfaces Applications
- Advanced Steganography and Watermarking Techniques
- Advanced Vision and Imaging
- Cell Image Analysis Techniques
- Image Processing Techniques and Applications
- Advanced Antenna and Metasurface Technologies
- Optical measurement and interference techniques
- Computer Graphics and Visualization Techniques
- Optical Coherence Tomography Applications
- Sparse and Compressive Sensing Techniques
- Image and Signal Denoising Methods
- Orbital Angular Momentum in Optics
- Interactive and Immersive Displays
- Soil Moisture and Remote Sensing
- Antenna Design and Analysis
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Advanced Algorithms and Applications
- Neural Networks and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
Chinese Academy of Sciences
2011-2024
BOE Technology Group (China)
2020-2024
Beijing Institute of Technology
2011-2024
Tsinghua University
2015-2024
Northeast Electric Power University
2011-2024
Zhengzhou University
2024
Southern Medical University
2022-2024
Nanfang Hospital
2024
Electric Power University
2024
Yunnan University
2024
Abstract Benefitting from the flexibility in engineering their optical response, metamaterials have been used to achieve control over propagation of light an unprecedented level, leading highly unconventional and versatile functionalities compared with natural counterparts. Recently, emerging field metasurfaces, which consist a monolayer photonic artificial atoms, has offered attractive for shaping wave fronts by introducing abrupt interfacial phase discontinuity. Here we realize...
Fast calculation and correct depth cue are crucial issues in the of computer-generated hologram (CGH) for high quality three-dimensional (3-D) display. An angular-spectrum based algorithm layer-oriented CGH is proposed. Angular spectra from each layer synthesized as a layer-corresponded sub-hologram on fast Fourier transform without paraxial approximation. The proposed method can avoid huge computational cost point-oriented yield accurate predictions whole diffracted field compared with...
Holographic reconstruction is troubled by the phase-conjugate wave front arising from Hermitian symmetry of complex field. The so-called twin image obfuscates in solving inverse problem. Here we quantitatively reveal how and much affects propose a compressive sensing (CS) approach to reconstruct hologram completely free image. Using canonical basis, incoherence condition CS naturally satisfied Fourier transformation associated with propagation. With propagation kernel function related...
Abstract The study of spontaneous emission has basic and supporting significance for enhancing the interaction between light matter, solid-state lighting biosensors. Hyperbolic metamaterials (HMMs) can support high k modes due to their hyperbolic dispersion characteristics, resulting in extremely photon density, which affects emission. Therefore, here we effect HMMs on quantum dots (QDs), Purcell factor reaches 20 times. At same time, structure with gold nanoantennas is studied. addition...
A technique is proposed theoretically and verified experimentally to eliminate a zero-order beam caused by pixelated phase-only spatial light modulator (SLM) for holographic projection. The formulas determination of the optical field in Fourier plane are deduced, influence structure SLM on intensity numerically investigated. Two currently existing techniques studied new one presented. These three used separately interruption, performances reconstructed patterns compared. results higher...
We propose an algorithm based on fully computed holographic stereogram for calculating full-parallax computer-generated holograms (CGHs) with accurate depth cues. The proposed method integrates point source and to reconstruct the three-dimensional (3D) scenes. Precise accommodation cue occlusion effect can be created, computer graphics rendering techniques employed in CGH generation enhance image fidelity. Optical experiments have been performed using a spatial light modulator (SLM)...
We propose a layer-based algorithm with single-viewpoint rendering geometry to calculate three-dimensional (3D) computer-generated hologram (CGH) occlusion effect. The 3D scene is sliced into multiple parallel layers according the depth information. Slab-based orthographic projection implemented generate shading information for each layer, which renders hidden primitives processing. angular spectrum silhouette mask culling used wave propagations from CGH plane without paraxial approximation....
Abstract Sustainable agricultural practices help to manage and use natural resources efficiently. Due global climate geospatial land design, soil texture, soil–water content (SWC), other parameters vary greatly; thus, real time, robust, accurate analytical measurements are difficult be developed. Conventional statistical analysis tools take longer analyze interpret data, which may have delayed a crucial decision. Therefore, this review paper is presented develop the researcher’s insight...
Previous stochastic localization-based super-resolution techniques are largely limited by the labeling density and fidelity to morphology of specimen. We report on an optical imaging scheme implementing joint tagging using multiple fluorescent blinking dyes associated with fluctuation (JT-SOFI), achieving ultra-high imaging. To demonstrate feasibility JT-SOFI, quantum dots different emission spectra were jointly labeled tubulin in COS7 cells, creating labeling. After analyzing combining...
Fusarium species are the most detrimental pathogens of soybean root rot worldwide, causing large loss in production. Maize/soybean relay strip intercropping has significant advantages on increase crop yields and efficient use agricultural resources, but its effects occurrence pathogen population rarely known. In this study, was investigated fields continuous maize/soybean monoculture. were isolated from diseased roots identified based sequence analysis translation elongation factor 1α...
Diffraction calculations are widely used in applications that require numerical simulation of optical wave propagation. Different diffraction calculation methods have their own transform and sampling properties. In this study, we provide a unified analysis where five popular fast analyzed from the perspective phase space optics theorem: single Fourier transform-based Fresnel transform, transfer function approach, impulse response angular spectrum method, Rayleigh-Sommerfeld convolution. The...
An iterative method with bandwidth constraint strategy is proposed to design phase holograms for high-quality speckle-free optical reconstruction. The properties of the reconstructed field are analyzed theoretically based on sampling theory, which helps in properly allocating resources efficiently describing speckles and artifacts field. Iterative calculation quadratic initial can optimize hologram without stagnation problem, provides effective controls intensity fluctuations suppress...
A weighted constraint iterative algorithm is presented to calculate phase holograms with quality reconstruction. The image plane partitioned into two regions where different strategies are implemented during the iteration process. In plane, signal region constrained directly according amplitude distribution of target based on an adaptive strategy, whereas non-signal indirectly by total energy control hologram conservation principle. strategy can improve reconstruction broadening optimizing...
Abstract A multivariate spatial linear coregionalization model is considered that incorporates the Matérn class of covariograms. An EM algorithm developed for maximum‐likelihood estimation has a few desirable properties and capable handling high‐dimensional data. Most estimates in are updated through closed form expressions these automatically satisfy necessary constraints. The illustrated real example. Copyright © 2006 John Wiley & Sons, Ltd.
We proposed a novel architecture for optical image encryption based on interference between two polarized wavefronts. A polarization-selective diffractive element is employed to generate the desired wavefronts by modulating incident light beam. The algorithm this new method simple and does not need iterative encoding. Numerical simulation performed demonstrate validity of method.
We propose an efficient algorithm using layered holographic stereogram for three-dimensional (3D) computer-generated holograms. The hologram is spatially partitioned into multiple elements (hogels) to provide the occlusion effect and motion parallax by use of viewpoint rendering. Each hogel calculated with inverse Fresnel diffraction slicing viewing frustum according depth image. sliced layers can accurate cues reconstruction since geometric information 3D scene faithfully matched....