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Review of Fresnel incoherent correlation holography with linear and non-linear correlations

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Chinese Optics Letters 2021年第2期19卷 1-6页

作者： Vijayakumar Anand Tomas Katkus Soon Hock Ng Saulius Juodkazis Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyHawthornVIC 3122Australia Melbourne Centre for Nanofabrication ANFFClaytonVIC 3168Australia tokyo tech world research hub initiative(WRHI) School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

Fresnel incoherent correlation holography(FINCH)is a well-established incoherent imaging technique.In FINCH,three selfinterference holograms are recorded with calculated phase differences between the two interfering,differently modulated object waves and projected into a complex hologram.The object is reconstructed without the twin image and bias terms by a numerical Fresnel back propagation of the complex hologram.A modified approach to implement FINCH by a single camera shot by pre-calibrating the system involving recording of the point spread function library and reconstruction by a nonlinear cross correlation has been introduced recently.The expression of the imaging characteristics from the modulation functions in original FINCH and the modified approach by pre-calibration in spatial and polarization multiplexing schemes are reviewed.The study reveals that a reconstructing function completely independent of the function of the phase mask is required for the faithful expression of the characteristics of the modulating function in image reconstruction.In the polarization multiplexing method by non-linear cross correlation,a partial expression was observed,while in the spatial multiplexing method by non-linear cross correlation,the imaging characteristics converged towards a uniform behavior.

关键词： digital holographic imaging Fresnel incoherent correlation holography holographic techniques imaging systems incoherent holography and speckle noise

Fresnel incoherent correlation holography with single camera shot

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Opto-Electronic Advances 2020年第8期3卷 12-22页

作者： Anand Vijayakumar Tomas Katkus Stefan Lundgaard Denver P.Linklater Elena P.Ivanova Soon Hock Ng Saulius Juodkazis Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyHawthorn 3122Australia Department of Physics Royal Melbourne Institute of TechnologyGPO Box 2476Melbourne 3001Australia Melbourne Centre for Nanofabrication Australian National Fabrication Facility151 Wellington RoadClaytonVIC 3168Australia tokyo tech world research hub initiative(WRHI) School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

Fresnel incoherent correlation holography(FINCH)is a self-interference based super-resolution three-dimensional imaging technique.FINCH in inline configuration requires an active phase modulator to record at least three phase-shifted camera shots to reconstruct objects without twin image and bias terms.In this study,FINCH is realized using a randomly multiplexed bifocal binary diffractive Fresnel zone lenses fabricated using electron beam lithography.The object space is calibrated by axially scanning a point object along the optical axis and recording the corresponding point spread holograms(PSHs).An object is mounted within the calibrated object space,and the object hologram was recorded under identical experimental conditions used for recording the PSHs.The image of the object at different depths was reconstructed by a cross-correlation between the object hologram and the PSHs.Application potential including bio-medical optics is discussed.

关键词： imaging holography correlation three-dimensional imaging diffractive optics

Mobility in China, 2020: a tale of four phases

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National Science Review 2021年第11期8卷 110-120页

作者： Suoyi Tan Shengjie Lai Fan Fang Ziqiang Cao Bin Sai Bing Song Bitao Dai Shuhui Guo Chuchu Liu Mengsi Cai Tong Wang Mengning Wang Jiaxu Li Saran Chen Shuo Qin Jessica R.Floyd Zhidong Cao Jing Tan Xin Sun Tao Zhou Wei Zhang Andrew J.Tatem Petter Holme Xiaohong Chen Xin Lu School of Business Central South University Institute of Big Data and Internet Innovations Hunan University of Technology and Business College of Systems Engineering National University of Defense Technology worldPop School of Geography and Environmental ScienceUniversity of Southampton School of Mathematics and Big Data Foshan University State Key Laboratory on Blind Signal Processing State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of Sciences Chinese Evidence-Based Medicine Center National Clinical Research Center for Geriatrics West China Hospital Sichuan University Big Data research Center University of Electronic Science and Technology of China West China Biomedical Big Data Center West China Hospital Sichuan University Tokyo Tech World Hub Research Initiative Institute of Innovative Research Tokyo Institute of Technology

2020 was an unprecedented year,with rapid and drastic changes in human mobility due to the COVID-19 pandemic.To understand the variation in commuting patterns among the Chinese population across stable and unstable periods,we used nationwide mobility data from 318 million mobile phone users in China to examine the extreme fluctuations of population movements in 2020,ranging from the Lunar New Year travel season(chunyun), to the exceptional calm of COVID-19 lockdown,and then to the recovery period.We observed that cross-city movements,which increased substantially in chunyun and then dropped sharply during the lockdown,are primarily dependent on travel distance and the socio-economic development of cities.Following the Lunar New Year holiday,national mobility remained low until mid-February,and COVID-19 interventions delayed more than 72.89 million people returning to large cities.Mobility network analysis revealed clusters of highly connected cities,conforming to the social-economic division of urban agglomerations in China.While the mass migration back to large cities was delayed,smaller cities connected more densely to form new clusters.During the recovery period after travel restrictions were lifted,the netflows of over 55% city pairs reversed in direction compared to before the lockdown.These findings offer the most comprehensive picture of Chinese mobility at fine resolution across various scenarios in China and are of critical importance for decision making regarding future public-health-emergency response,transportation planning and regional economic development,among others.

关键词： human mobility travel restrictions COVID-19 mobile phone data behavioral response

Monolayer Graphitic Carbon Nitride as Metal-Free Catalyst with Enhanced Performance in Photo- and Electro-Catalysis

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Nano-Micro Letters 2022年第3期14卷 308-321页

作者： Huiyan Piao Goeun Choi Xiaoyan Jin Seong‑Ju Hwang Young Jae Song Sung‑Pyo Cho Jin‑Ho Choy Intelligent Nanohybrid Materials Laboratory(INML) Institute of Tissue Regeneration Engineering(ITREN)Dankook UniversityCheonan 31116Republic of Korea College of Science and technology Dankook UniversityCheonan 31116Republic of Korea Department of Nanobiomedical Science and BK21 PLUS NBM Global research Center for Regenerative Medicine Dankook UniversityCheonan 31116Republic of Korea Department of Materials Science and Engineering College of EngineeringYonsei UniversitySeoul 03722Republic of Korea SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan University(SKKU)Suwon 440‑746Republic of Korea Department of Nano Engineering Sungkyunkwan University(SKKU)Suwon 440‑746Republic of Korea National Center for Inter‑University research Facilities(NCIRF) Seoul National UniversitySeoul 08826Republic of Korea Graphene research Center Advanced Institute of Convergence TechnologySuwon 16229Republic of Korea Department of Pre‑Medical Course College of MedicineDankook UniversityCheonan 31116Republic of Korea tokyo tech world research hub initiative(WRHI) Institute of Innovative ResearchTokyo Institute of TechnologyYokohama 226‑8503Japan

The exfoliation of bulk graphitic carbon nitride(g-C_(3)N_(4))into monolayer has been intensively studied to induce maximum sur-face area for fundamental studies,but ended in failure to realize chemi-cally and physically well-defined monolayer of g-C_(3)N_(4)mostly due to the difficulty in reducing the layer thickness down to an atomic level.It has,therefore,remained as a challenging issue in two-dimensional(2D)chemistry and physics communities.In this study,an“atomic monolayer of g-C_(3)N_(4)with perfect two-dimensional limit”was successfully prepared by the chemically well-defined two-step routes.The atomically resolved monolayer of g-C_(3)N_(4)was also confirmed by spectroscopic and micro-scopic analyses.In addition,the experimental Cs-HRTEM image was collected,for the first time,which was in excellent agreement with the theoretically simulated;the evidence of monolayer of g-C_(3)N_(4)in the perfect 2D limit becomes now clear from the HRTEM image of orderly hexagonal symmetry with a cavity formed by encirclement of three adjacent heptazine units.Compared to bulk g-C_(3)N_(4),the present g-C_(3)N_(4)monolayer showed significantly higher photocatalytic gen-eration of H2O2 and H2,and electrocatalytic oxygen reduction reaction.In addition,its photocatalytic efficiency for H2O2 production was found to be the best for any known g-C_(3)N_(4)nanomaterials,underscoring the remarkable advantage of monolayer formation in optimizing the catalyst performance of g-C_(3)N_(4).

关键词： Graphitic carbon nitride Monolayer Atomic image Electro-and photo-catalysis

Single-shot mid-infrared incoherent holography using Lucy-Richardson-Rosen algorithm

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Opto-Electronic Science 2022年第3期1卷 1-8,I0001页

作者： Vijayakumar Anand Molong Han Jovan Maksimovic Soon Hock Ng Tomas Katkus Annaleise Klein Keith Bambery Mark J.Tobin Jitraporn Vongsvivut Saulius Juodkazis Optical Sciences Center and ARC Training Centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceComputing and Engineering TechnologiesOptical Sciences CenterSwinburne University of TechnologyHawthornMelbourneVictoria 3122Australia Institute of Physics University of Tartu50411 TartuEstonia Infrared Microspectroscopy(IRM)Beamline ANSTO-Australian SynchrotronClaytonVictoria 3168Australia tokyo tech world research hub initiative(WRHI) School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

In recent years,there has been a significant transformation in the field of incoherent imaging with new possibilities of compressing three-dimensional(3D)information into a two-dimensional intensity distribution without two-beam interference(TBI).Most of the incoherent 3D imagers without TBI are based on scattering by a random phase mask exhibiting sharp autocorrelation and low cross-correlation along the depth.Consequently,during reconstruction,high lateral and axial resolutions are obtained.Imaging based on scattering requires an astronomical photon budget and is therefore precluded in many power-sensitive applications.In this study,a proof-of-concept 3D imaging method without TBI using deterministic fields has been demonstrated.A new reconstruction method called the Lucy-Richardson-Rosen algorithm has been developed for this imaging concept.We believe that the proposed approach will cause a paradigm-shift in the current state-of-the-art incoherent imaging,fluorescence microscopy,mid-infrared fingerprinting,astronomical imaging,and fast object recognition applications.

关键词： imaging holography mid-infrared spectroscopy incoherent optics computational optics mid-infrared imaging

Review of engineering techniques in chaotic coded aperture imagers

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Light(Advanced Manufacturing)

Light(Advanced Manufacturing) 2022年第4期3卷 113-125页

作者： Vijayakumar Anand Joseph Rosen Saulius Juodkazis Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyHawthornVIC 3122Australia Institute of Physics University of Tartu50411 TartuEstonia School of Electrical and Computer Engineering Ben-Gurion University of the NegevP.O.Box 653Beer-Sheva 8410501Israel tokyo tech world research hub initiative(WRHI) School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1OokayamaMegurokuTokyo 152-8550Japan

Coded aperture imaging(CAI)is a technique to image three-dimensional scenes with special controlled abilities.In this review,we survey several recently proposed techniques to control the parameters of CAI by engineering the aperture of the system.The prime architectures of these indirect methods of imaging are reviewed.For each design,we mention the relevant application of the CAI recorders and summarize this overview with a general perspective on this research topic.

关键词： Coded aperture imaging Holography Chaos engineering Incoherent optics Diffractive optics

Tunable vertical ferroelectricity and domain walls by interlayer sliding inβ-ZrI_(2)

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npj Computational Materials 2021年第1期7卷 1600-1608页

作者： Xiaonan Ma Chang Liu Wei Ren Sergey A.Nikolaev Physics Department State Key Laboratory of Advanced Special Steeland International Center of Quantum and Molecular StructuresShanghai UniversityShanghai 200444China Materials Genome Institute and Shanghai Key Laboratory of High Temperature SuperconductorsShanghai UniversityShanghai 200444China tokyo tech world research hub initiative(WRHI) Institute of Innovative ResearchTokyo Institute of Technology4259 NagatsutaMidori-kuYokohamaKanagawa 226-8503Japan Laboratory for Materials and Structures Tokyo Institute of Technology4259 NagatsutaMidori-kuYokohamaKanagawa 226-8503Japan National Institute for Materials Science MANA1-1 NamikiTsukubaIbaraki 305-0044Japan

Vertical ferroelectricity where a net dipole moment appears as a result of in-plane ionic displacements has gained enormous attention following its discovery in transition metal dichalcogenides.Based on first-principles calculations,we report on the evidence of robust vertical ferroelectricity upon interlayer sliding in layered semiconductingβ-ZrI_(2),a sister material of polar semimetals MoTe_(2)and WTe_(2).The microscopic origin of ferroelectricity in ZrI_(2)is attributed to asymmetric shifts of electronic charges within a trilayer,revealing a subtle interplay of rigid sliding displacements and charge redistribution down to ultrathin thicknesses.We further investigate the variety of ferroelectric domain boundaries and predict a stable charged domain wall with a quasi-twodimensional electron gas and a high built-in electric field that can increase electron mobility and electromechanical response in multifunctional devices.Semiconducting behaviour and a small switching barrier of ZrI_(2)hold promise for various ferroelectric applications,and our results provide important insights for further development of slidetronics ferroelectricity.

关键词： ferroelectric interlayer walls

Machine-learning-assisted discovery of polymers with high thermal conductivity using a molecular design algorithm

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npj Computational Materials 2019年第1期5卷 569-579页

作者： Stephen Wu Yukiko Kondo Masa-aki Kakimoto Bin Yang Hironao Yamada Isao Kuwajima Guillaume Lambard Kenta Hongo Yibin Xu Junichiro Shiomi Christoph Schick Junko Morikawa Ryo Yoshida The Institute of Statistical Mathematics Research Organization of Information and SystemsTachikawaTokyo 190-8562Japan The Graduate University for Advanced Studies TachikawaTokyo 190-8562Japan Center for Materials research by Information Integration(CMI2) Research and Services Division of Materials Data and Integrated System(MaDIS)National Institute for Materials Science(NIMS)TsukubaIbaraki 305-0047Japan Institute of Physics and Competence Centre CALOR University of Rostock18059 RostockGermany Japan Advanced Institute of Science and technology NomiIshikawa 923-1292Japan PRESTO JSTKawaguchiSaitama 332-0012Japan The University of tokyo Bunkyo-kuTokyo 113-8656Japan tokyo tech world research hub initiative(WRHI) Tokyo Institute of TechnologyTokyo 226-8503Japan tokyo Institute of technology Meguro-kuTokyo 152-8550Japan

The use of machine learning in computational molecular design has great potential to accelerate the discovery of innovative materials.However,its practical benefits still remain unproven in real-world applications,particularly in polymer science.We demonstrate the successful discovery of new polymers with high thermal conductivity,inspired by machine-learning-assisted polymer chemistry.This discovery was made by the interplay between machine intelligence trained on a substantially limited amount of polymeric properties data,expertise from laboratory synthesis and advanced technologies for thermophysical property measurements.Using a molecular design algorithm trained to recognize quantitative structure—property relationships with respect to thermal conductivity and other targeted polymeric properties,we identified thousands of promising hypothetical polymers.From these candidates,three were selected for monomer synthesis and polymerization because of their synthetic accessibility and their potential for ease of processing in further applications.The synthesized polymers reached thermal conductivities of 0.18–0.41 W/mK,which are comparable to those of state-of-the-art polymers in non-composite thermo-plastics.

关键词： conductivity thermal property

Beyond Lambertian light trapping for large-area silicon solar cells:fabrication methods

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Opto-Electronic Advances 2022年第9期5卷 14-25页

作者： Jovan Maksimovic Jingwen Hu Soon Hock Ng Tomas Katkus Gediminas Seniutinas Tatiana Pinedo Rivera Michael Stuiber Yoshiaki Nishijima Sajeev John Saulius Juodkazis Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyHawthorn Vic 3122Australia Melbourne Centre for Nanofabrication ANFF Victoria151 Wellington Rd.Clayton Vic 3168 Australia Department of Electrical and Computer Engineering Graduate School of EngineeringYokohama National University79-5 TokiwadaiHodogaya-kuYokohama 240-8501Japan Institute of Advanced Sciences Yokohama National University79-5 TokiwadaiHodogaya-kuYokohama 240-8501Japan Department of Physics University of Toronto60 St.George StreetTorontoONM5S 1A7Canada world research hub initiative(WRHI) School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

Light trapping photonic crystal(PhC)patterns on the surface of Si solar cells provides a novel opportunity to approach the theoretical efficiency limit of 32.3%,for light-to-electrical power conversion with a single junction cell.This is beyond the efficiency limit implied by the Lambertian limit of ray trapping~29%.The interference and slow light effects are harnessed for collecting light even at the long wavelengths near the Si band-gap.We compare two different methods for surface patterning,that can be extended to large area surface patterning:1)laser direct write and 2)step-&-repeat 5×reduction projection lithography.Large area throughput limitations of these methods are compared with the established elec-tron beam lithography(EBL)route,which is conventionally utilised but much slower than the presented methods.Spec-tral characterisation of the PhC light trapping is compared for samples fabricated by different methods.Reflectance of Si etched via laser patterned mask was~7%at visible wavelengths and was comparable with Si patterned via EBL made mask.The later pattern showed a stronger absorbance than the Lambertian limit6.

关键词： silicon solar cells laser ablation light trapping Lambertian limit