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Advent of torsional optomechanics from Beth’s legacy

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Advanced Photonics 2023年第4期5卷 3-4页

作者： jaehyuck jang jungho Mun j.nsuk rho Pohang University of Science and Technology(POSTECH) Department of Chemical EngineeringPohangRepublic of Korea Pohang University of Science and Technology(POSTECH) Department of Mechanical EngineeringPohangRepublic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics PohangRepublic of Korea

Torsional optomechanics,which involves the transfer of angular mo-mentum from light to matter,has been a vibrant research area since Beth’s pioneering contribution in *** proposed a method to measure the transfer of spin angular momentum using a torsional pen-dulum,1 laying the foundation for classical and quantum optomechanics related to particle levitation,trapping,and cooling in modern optics.

关键词： angular optics momentum

Academic productivity correlates with industry earnings in foot and ankle fellowship programs in the United States:A retrospective analysis

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World journal of Orthopedics 2024年第2期15卷 129-138页

作者： Albert T Anastasio Anthony N Baumann Kempland C Walley Kyle j Hitchman Conor O’Neill jonathan Kaplan Samuel B Adams Department of Orthopedic Surgery Duke University HospitalDurhamNC 27710United States College of Medicine Northeast Ohio Medical UniversityRootstownOH 44272United States Department of Orthopedic Surgery University of MichiganAnn ArborMI 48109United States School of Osteopathic Medicine Campbell UniversityLillingtonNC 27546United States

BACKGROUND The study investigates the connection between academic productivity and industry earnings in foot and ankle orthopedic surgery *** metrics like the H-index and Open Payments Database(OPD)data,it addresses a gap in understanding the relationship between scholarly achievements and financial outcomes,providing a basis for further exploration in this specialized medical *** To elucidate the trends between academic productivity and industry earnings across foot and ankle orthopedic surgery fellowship programs in the United *** This study is a retrospective analysis of the relationship between academic productivity and industry earnings of foot and ankle orthopedic surgery fellowships at an individual faculty and fellowship *** productivity was defined via H-index and recorded from the Scopus *** earnings were recorded from the *** Forty-eight foot and ankle orthopedic surgery fellowships(100%of fellowships)in the United States with a combined total of 165 physicians(95.9%of physicians)were *** individual physician(n=165)total life-time earnings reported on the OPD website was United States Dollar(USD)451430.30±1851084.89(range:USD 25.16-21269249.85;median:USD 27839.80).Mean physician(n=165)H-index as reported on Scopus is 14.24±12.39(range:0-63;median:11).There was a significant but weak correlation between individual physician H-index and individual physician total life-time earnings(Prho=0.334)and a significant and moderate positive correlation between combined fellowship H-index and total life-time earnings per fellowship(P=0.004,Spearman’s rho=0.409).CONCLUSION There is a significant and positive correlation between academic productivity and industry earnings at foot and ankle orthopedic surgery fellowships in the United *** observation is true on an individual physician level as well as on a fellowship level.

关键词： Sunshine act Foot and ankle Orthopedic surgery Orthopedic fellowship Industry earnings

Numerical study on the performance of nozzle flow for supersonic chemical oxygen-iodine lasers

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Acta Mechanica Sinica 2008年第2期24卷 133-142页

作者： Zongmin Hu junming Lā Zonglin jiang rho-Shin Myong Tae-Hwan Cho LHD Institute of MechanicsCAS Beijing 100080 China Research Center for Aircraft Parts Technology Geyongsang National University Jinju 660-701 South Korea

Laser performance is greatly dependent on its operating conditions due to the strong coupling among multi- physics such as gas-dynamics, chemical reaction kinetics and optics in the mixing nozzle of COIL. In this paper, 3D CFD technology is used to simulate the mixing and reactive flow of subsonic cross jet scheme at different conditions. Results obtained show that the jet penetration depth plays a dominant role in the spatial distribution of small signal gains. In the case of over-penetration, unsteady flow structures are induced by impinging between the opposing jets. The optimum spatial distribution of the chemical performance cannot be obtained even if the full penetration condition is achieved through the subsonic transverse jet mixing scheme in the COIL nozzle flow.

关键词： Chemical oxygen-iodine laser (COIL) Numerical simulation Small signal gains Unsteady structures

Thermally-curable nanocomposite printing for the scalable manufacturing of dielectric metasurfaces

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Microsystems & Nanoengineering 2022年第4期8卷 73-80页

作者： Wonjoong Kim Gwanho Yoon joohoon Kim Heonyeong jeong Yeseul Kim Hojung Choi Trevon Badloe j.nsuk rho Heon Lee Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Manufacturing Systems and Design Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECHRIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea

Metasurfaces consisting of artificially designed meta-atoms have been popularized recently due to their advantages of amplitude and phase of light ***,the electron beam lithography method for metasurface fabrication has high cost and low throughput,which results in a limitation for the fabrication of *** this study,nanocomposite printing technology is used to fabricate high-efficiency metasurfaces with low *** demonstrate the efficiency of the proposed fabrication method,a metahologram is designed and fabricated using a *** metahologram exhibits conversion efficiencies of 48%and 35%at wavelengths of 532 and 635 nm,*** nanocomposite is composed of polymers with nanoparticles,so durability tests are also performed to evaluate the effects of temperature and humidity on the *** test verifies that at temperatures below the glass transition temperature of the base resin,the nanostructures do not collapse,so the efficiency of the metasurfaces remains almost the *** surrounding humidity does not affect the nanostructures at ***,the durability of the nanocomposite metasurfaces can be further enhanced by replacing the base resin,and this nanocomposite printing method will facilitate practical metasurface use at low cost.

关键词： surfaces durability resin

Intelligent Prediction Approach for Diabetic Retinopathy Using Deep Learning Based Convolutional Neural Networks Algorithm by Means of Retina Photographs

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Computers, Materials & Continua 2021年第2期66卷 1613-1629页

作者： G.Arun Sampaul Thomas Y.Harold Robinson E.Golden julie Vimal Shanmuganathan Seungmin rho Yunyoung Nam CSE Department J.B.Institute of Engineering and TechnologyHyderabad500075India School of Information Technology and Engineering Vellore Institute of TechnologyVellore632014India Department of Computer Science and Engineering Anna University Regional CampusTirunelveli627007India Department of Information Technology National Engineering CollegeKovilpatti628503India Department of Software Sejong University209 Neungdong-roGwangjin-guSeoul05006Korea Department of Computer Science and Engineering Soonchunhyang UniversityAsan31538Korea

Retinopathy is a human eye disease that causes changes in retinal blood vessels that leads to bleed,leak fluid and vision *** of retinopathy are blurred vision,changes in color perception,red spots,and eye pain and it cannot be detected with a naked *** this paper,a new methodology based on Convolutional Neural Networks(CNN)is developed and proposed to intelligent retinopathy prediction and give a decision about the presence of retinopathy with automatic diabetic retinopathy screening with accurate *** CNN model is trained by different images of eyes that have retinopathy and those which do not have *** fully connected layers perform the classification process of the images from the dataset with the pooling layers minimize the coherence among the adjacent *** feature loss factor increases the label value to identify the patterns with the kernel-based *** performance of the proposed model is compared with the related methods of DREAM,KNN,GD-CNN and *** results show that the proposed CNN performs better.

关键词： Convolutional neural networks dental diagnosis image recognition diabetic retinopathy detection

Emerging low-cost,large-scale photonic platforms with soft lithography and self-assembly

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Photonics Insights 2023年第2期2卷 3-31页

作者： Hyunjung Kang Dohyeon Lee Younghwan Yang Dong Kyo Oh junhwa Seong jaekyung Kim Nara jeon Dohyun Kang j.nsuk rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics PohangRepublic of Korea

Advancements in micro/nanofabrication have enabled the realization of practical micro/nanoscale photonic devices such as absorbers,solar cells,metalenses,and *** the performance of these photonic devices has been improved by enhancing the design flexibility of structural materials through advanced fabrication methods,achieving large-area and high-throughput fabrication of tiny structural materials remains a *** this aspect,various technologies have been investigated for realizing the mass production of practical devices consisting of micro/nanostructural *** review describes the recent advancements in soft lithography,colloidal self-assembly,and block copolymer self-assembly,which are promising methods suitable for commercialization of photonic *** addition,we introduce low-cost and large-scale techniques realizing micro/nano devices with specific examples such as display technology and *** inferences presented in this review are expected to function as a guide for promising methods of accelerating the mass production of various sub-wavelength-scale photonic devices.

关键词： nanofabrication scalable manufacturing soft lithography colloidal self-assembly block copolymer self-assembly

Giant chiro-optical responses in multipolar-resonances-based single-layer dielectric metasurfaces

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Photonics Research 2021年第9期9卷 1667-1674页

作者： HAFIZ SAAD KHALIQ INKI KIM AIMA ZAHID jOOHOON KIM TAEjUN LEE TREVON BADLOE YESEUL KIM MUHAMMAD ZUBAIR KASHIF RIAZ MUHAMMAD QASIM MEHMOOD j.nsuk rho NanoTech Lab Department of Electrical EngineeringInformation Technology University(ITU)of the PunjabLahore 54600Pakistan Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea

Chiro-optical effects offer a wide range of potential applications in nanophotonics,such as advanced imaging and molecular sensing and *** single-layer metasurfaces composed of subwavelength meta-atoms have gained significant attention due to their exceptional characteristics in light–matter *** metasurface-based devices have manipulated electromagnetic waves,the compact on-chip realization of giant chiro-optical effects remains a challenge at optical *** this work,we experimentally and numerically demonstrate an all-dielectric metasurface to realize large chiro-optical effects in the visible ***,the proposed strategy of utilizing achiral nanofins instead of conventional chiral structures provides an extra degree of design *** mutual coupling between carefully engineered nanofins produces constructive and destructive interference,leading to the asymmetric transmission of 70%and average circular dichroism exceeding 60%.We investigate the underlying mechanism behind the chiro-optical effects using the theory of multipolar *** proposed design mechanism maximizes the chiro-optical response through a single-layer metasurface with potential applications in high-efficiency integrated ultrathin polarization rotators and shapers,chiral polarizers for optical displays,chiral beam splitters,and chiral sensors.

关键词： chiral dielectric polar

Multiple-patterning colloidal lithography-implemented scalable manufacturing of heat-tolerant titanium nitride broadband absorbers in the visible to near-infrared

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Microsystems & Nanoengineering 2021年第2期7卷 51-58页

作者： Dasol Lee Myeongcheol Go Minkyung Kim junho jang Chungryong Choi jin Kon Kim j.nsuk rho Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang37673Republic of Korea

Broadband perfect absorbers have been intensively researched for decades because of their near-perfect absorption optical property that can be applied to diverse applications. Unfortunately, achieving large-scale and heat-tolerant absorbers has been remained challenging work because of costly and time-consuming lithography methods and thermolability of materials, respectively. Here, we demonstrate a thermally robust titanium nitride broadband absorber with >95% absorption efficiency in the visible and near-infrared region (400–900 nm). A relatively large-scale (2.5 cm × 2.5 cm) absorber device is fabricated by using a fabrication technique of multiple-patterning colloidal lithography. The optical properties of the absorber are still maintained even after heating at the temperatures >600 ∘C. Such a large-scale, heat-tolerant, and broadband near-perfect absorber will provide further useful applications in solar thermophotovoltaics, stealth, and absorption controlling in high-temperature conditions.

关键词： absorber titanium absorption

Modular operation of microfluidic chips for highly parallelized cell culture and liquid dosing via a fluidic circuit board

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Microsystems & Nanoengineering 2020年第1期6卷 106-121页

作者： A.R.Vollertsen D.de Boer S.Dekker B.A.M.Wesselink R.Haverkate H.S.rho R.j.Boom M.Skolimowski M.Blom R.Passier A.van den Berg A.D.van der Meer M.Odijk BIOS Lab on Chip Group MESA+Institute for NanotechnologyUniversity of TwenteEnschedeThe Netherlands Mesoscale Chemical Systems MESA+Institute for NanotechnologyUniversity of TwenteEnschedeThe Netherlands Institute for Technology-Inspired Regenerative Medicine Maastricht UniversityMaastrichtThe Netherlands Micronit Microtechnologies EnschedeThe Netherlands Applied Stem Cell Technologies TechMed CentreUniversity of TwenteEnschedeThe Netherlands

Microfluidic systems enable automated and highly parallelized cell culture with low volumes and defined liquid *** achieve this,systems typically integrate all functions into a single,monolithic device as a“one size fits all”***,this approach limits the end users’(re)design flexibility and complicates the addition of new functions to the *** address this challenge,we propose and demonstrate a modular and standardized plug-and-play fluidic circuit board(FCB)for operating microfluidic building blocks(MFBBs),whereby both the FCB and the MFBBs contain integrated valves.A single FCB can parallelize up to three MFBBs of the same design or operate MFBBs with entirely different *** operation of the MFBBs through the FCB is fully automated and does not incur the cost of an extra external *** use this modular platform to control three microfluidic large-scale integration(mLSI)MFBBs,each of which features 64 microchambers suitable for cell culturing with high spatiotemporal *** show as a proof of principle that we can culture human umbilical vein endothelial cells(HUVECs)for multiple days in the chambers of this ***,we also use the same FCB to control an MFBB for liquid dosing with a high dynamic *** results demonstrate that MFBBs with different designs can be controlled and combined on a single *** novel modular approach to operating an automated microfluidic system for parallelized cell culture will enable greater experimental flexibility and facilitate the cooperation of different chips from different labs.

关键词： FCB operation culture