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Resolution enhancement of optical scanning holography with a spiral modulated point spread function

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Photonics Research 2016年第1期4卷 1-6页

作者： Ni Chen Zhenbo Ren haiyan ou Edmund Y.Lam Department of Electrical and Electronic Engineering The University of Hong Kong Institute of Applied Physics University of Electronic Science and Technology of China

In optical scanning holography, one pupil produces a spherical wave and another produces a plane wave. They interfere with each other and result in a fringe pattern for scanning a three-dimensional object. The resolution of the hologram reconstruction is affected by the point spread function(PSF) of the optical system. In this paper, we modulate the PSF by a spiral phase plate, which significantly enhances the lateral and depth resolution. We explain the theory for such resolution enhancement and show simulation results to verify the efficacy of the approach.

关键词： PSF Resolution enhancement of optical scanning holography with a spiral modulated point spread function

Comparison of wavelength conversion efficiency between silicon waveguide and microring resonator

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Frontiers of Optoelectronics 2016年第3期9卷 390-394页

作者： Meng XIONG Yunhong DING haiyan ou Christophe PEUCHERET Xinliang ZHANG Department of Photonics Engineering Technical University of Denmark 2800 Kgs. Lyngby Denmark FOTON Laboratory CNRS UMR 6082 ENSSAT University of Rennes 1 F-22305 Lannion France Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wtthan 430074 China

Wavelength conversion based on degenerate four-wave mixing （FWM） was demonstrated and compared between silicon nanowire and microring resonator （MRR）. 15 dB enhancement of conversion efficiency （CE） with relatively low input pump power （5roW） was achieved experimentally in an MRR. The impacts of bus waveguide length and propagation loss were theoretically analyzed under the effect of nonlinear loss.

关键词： wavelength conversion four-wave mixing (FWM) silicon nanowaire microring resonator (MRR)

Compact low-birefringence polarization beam splitter using vertical-dual-slot waveguides in silicon carbide integrated platforms

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Photonics Research 2022年第1期10卷 I0008-I0013页

作者： XIAODONG SHI JINGJING ZHANG WEICHEN FAN YAOQIN LU NIANHUA PENG KARSTEN ROTTWITT AND haiyan ou DTU Fotonik Technical University of DenmarkDK-2800 LyngbyDenmark Institute of Mirco/Nano Optoelectronic and Terahertz Technology Jiangsu UniversityZhenjiang 212013China Surrey Ion Beam Centre Surrey UniversityGuildfordGU27XHUK

The polarization beam splitter is a key component for polarization manipulation in photonic integrated circuits,but it is challenging to design for low-refractive-index optical materials,due to the low birefringence of the *** propose what we believe is a novel compact vertical-dual-slot waveguide-based coupling scheme for silicon carbide,enabling efficient low-birefringence polarization splitting by extensively modulating the transverse-magnetic mode *** numerically and experimentally demonstrate the device in the 4H-siliconcarbide-on-insulator integrated platform,with a small footprint of 2.2 μm × 15 μ*** device,easy to fabricate via a single lithography process as other components on the chip,exhibits low insertion loss of 13 dB,over 80 nm wavelength range.

关键词： polarization waveguides waveguide

Autofocus by Lissajous scanning in time reversal optical scanning holography

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Chinese Optics Letters 2024年第8期22卷 13-20页

作者： Jie Liu haiyan ou Hua Wang Lin Peng Wei Shao Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518000China School of Physics University of Electronic Science and Technology of ChinaChengdu 611731China Key Laboratory of Cognitive Radio and Information Processing Guilin University of Electronic TechnologyGuilin 541004China

In this Letter, an autofocusing method in optical scanning holography(OSH) system is proposed. By introducing Lissajous scanning into multiple signal classification(MUSIC) method in time-reversal(TR) OSH, the axial locations of the targets can be retrieved with better resolution and the peak prominence increases from 0.21 to 0.34. The feasibility of this method is confirmed by simulation as well as experiment.

关键词： digital holography Lissajous scanning image reconstruction axial localization

Generation rate scaling: the quality factor optimization of microring resonators for photon-pair sources

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Photonics Research 2018年第6期6卷 587-596页

作者： KAI GUO XIAODONG SHI XIAOLIN WANG JUNBO YANG YUNHONG DING haiyan ou YIJUN ZHAO College of Advanced Interdisciplinary Studies National University of Defense Technology Department of Photonics Engineering Technical University of Denmark Center of Material Science College of Liberal Arts and SciencesNational University of Defense Technology

To achieve photon-pair generation scaling, we optimize the quality factor of microring resonators for efficient continuous-wave-pumped spontaneous four-wave mixing. Numerical studies indicate that a high intrinsic quality factor makes high pair rate and pair brightness possible, in which the maximums take place under overcoupling and critical-coupling conditions, respectively. We fabricate six all-pass-type microring resonator samples on a silicon-on-insulator chip involving gap width as the only degree of freedom. The signal count rate, pair brightness,and coincidence rate of all the samples are characterized, which are then compared with the modified simulations by taking the detector saturation and nonlinear loss into account. Being experimentally validated for the first time to the best of our knowledge, this work explicitly demonstrates that reducing the round-trip loss in a ring cavity and designing the corresponding optimized gap width are more effective to generate high-rate or high-brightness photon pairs than the conventional strategy of simply increasing the quality factor.

关键词： Nonlinear optics four-wave mixing Quantum optics Nonlinear optics devices

Enhanced depth resolution in optical scanning holography using a configurable pupil

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Photonics Research 2014年第2期2卷 64-70页

作者： haiyan ou Ting-Chung Poon Kenneth K.Y.Wong Edmund Y.Lam Department of Electrical and Electronic Engineering University of Hong KongPokfulamHong KongChina Institute of Applied Physics University of Electronic Science and Technology of China610054ChengduChina Bradley Department of Electrical and Computer Engineering Virginia TechBlacksburgVirginia 24061USA

The optical scanning holography(OSH)technique can capture all the three-dimensional volume information of an object in a hologram via a single raster *** digital hologram can then be processed to reconstruct individual sectional images of the *** this paper,we present a scheme to reconstruct sectional images in OSH with enhanced depth resolution,where a spatial light modulator(SLM)is adopted as a configurable point *** switching the SLM between two states,different Fresnel zone plates(FZPs)are generated based on the same optical *** extra information provided by different FZPs,a depth resolution at 0.7μm can be achieved.

关键词： resolution sectional Fresnel

Schizophrenia-associated rs4702 G allele-specific downregulation of FURIN expression by miR-338-3p reduces BDNF production

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Schizophrenia-associated rs4702 G allele-specific downregula...

Linear all-optical signal processing using silicon micro-ring resonators

2018中国遗传学会第十次全国会员代表大会暨学术讨论会

作者： Wenquan Liang Yu Hou Wenquan Liang Jian Zhang Qiyang Li haiyan ou Zhongju Wang Shufen Li Cunyou Zhao Department of Medical Genetics School of Basic Medical SciencesSouthern Medical University Guangdong Technology and Engineering Research Center for Molecular Diagnostics of Human Genetic Diseases Guangdong Province Key Laboratory of Psychiatric Disorders

Genome-wide association studies（GWAS） have revealed numerous schizophrenia（SCZ）-associated single-nucleotide polymorphisms（SNPs）;however, functional characterizations of the risk variants remain to be established. Using data from 108 SCZ GWAS loci, we performed systematic miRNA binding site screening of 128 SCZ-associated SNPs and found that 2 out of 3 SNPs located in the 3’UTR were predicted to alter 3 miRNAs’ binding sites in 2 target genes. Of the identified SNPs, the most genomewide significant SNP rs4702（A/G） in the FURIN 3’UTR, previously identified as an SCZ-associated cisexpression quantitative trait loci（downregulated by the risk G allele）, is located in the binding site of miR-338-3 p in the presence of the risk G allele. Allele-specific downregulation of FURIN by miR-338-3 p was validated with a luciferase reporter assay. Furthermore, we demonstrated that miR-338-3 p-mediated FURIN inhibition reduced brain-derived neurotrophic factor（BDNF） maturation and secretion in human embryonic kidney 293 T cells. our data reveal that schizophrenia-associated rs4702 G allele-specific downregulation of FURIN by mi R-338-3 p reduces mature BDNF production. These data help elucidate the mechanism of genetic predisposition toward schizophrenia or other neurodevelopmental diseases.

关键词： miRNA FURIN genome-wide association study schizophrenia single-nucleotide polymorphism BDNF

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Frontiers of Optoelectronics 2016年第3期9卷 362-376页

作者： Yunhong DING haiyan ou Jing XU Meng XIONG Yi AN Hao HU Michael GALILI Abel Lorences RIESGO Jorge SEOANE Kresten YVIND Leif Katsuo OXENLOWE Xinliang ZHANG Dexiu HUANG Christophe PEUCHERET Department of Photonics Engineering Technical University of Denmark 2800 Kgs. Lyngby Denmark Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden FOTON Laboratory CNRS UMR 6082 University of Rennes 1 ENSSAT 22300 Lannion France

Silicon micro-ring resonators （MRRs） are compact and versatile devices whose periodic frequency response can be exploited for a wide range of applications. In this paper, we review our recent work on linear all-optical signal processing applications using silicon MRRs as passive filters. We focus on applications such as modulation format conversion, differential phase-shift keying （DPSK） demodulation, modulation speed enhancement of directly modulated lasers （DMLs）, and monocycle pulse generation. The possibility to implement polarization diversity circuits, which reduce the polarization dependence of standard silicon MRRs, is illustrated on the particular example of DPSK demodulation.

关键词： linear all-optical signal processing micro-ring resonator (MRR) polarization diversity silicon-on-insulator (SOI)

Suppressing defocus noise with U-net in optical scanning holography

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Chinese Optics Letters 2023年第8期21卷 29-37页

作者：欧海燕吴勇朱坤林彦民王秉中 School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen 518000China Department of Electronic and Information Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina

Optical scanning holography(OSH)records both the amplitude and phase information of a 3D object by a 2D *** reconstruct a 3D volumetric image from an OSH hologram is difficult,as it suffers from the defocus noise from the other *** use of a random phase pupil can convert defocus noise into speckle-like noise,which may require further processing in sectional image *** this paper,we propose a U-shaped neural network to reduce this speckle *** results show that the proposed method works effectively and efficiently both in simple and complex graphics.

关键词： digital holography image reconstruction defocus noise neural network