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From non-scattering to super-scattering with mie-tronics

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Photonics Research 2024年第4期12卷 608-624页

作者： HOOmAN BARATI SEDEH natalia m.litchinitser Department of Electrical and Computer Engineering Duke UniversityDurhamNorth Carolina 27708USA

Electric anapoles, arising from the destructive interference of primitive and toroidal electric dipole moments, have recently emerged as a fundamental class of non-scattering sources. On the other hand, super-scattering states represent the opposite regime wherein the scattering cross-section of a subwavelength particle exceeds the single-channel limit, leading to a strong scattering behavior. Here, we demonstrate that the interplay between the topology of light and the subwavelength scatterer can lead to these two opposite responses within an isolated alldielectric meta-atom. In particular, we present the emergence of a new non-scattering state, referred to as hybrid anapole, which surpasses conventional electric dipole anapoles by achieving a remarkable 23-fold enhancement in the suppression of far-field radiation and almost threefold enhancement in the confinement of electromagnetic energy inside the meta-atom. We also explore the role of particle orientation and its inversion symmetry in the scattering response and predict the possibility of switching between non-scattering and super-scattering states within the same platform. The presented study elucidates the role of light and matter topologies in the scattering response of subwavelength meta-atoms, uncovering two opposite regimes of light-matter interaction and opening new avenues in applications such as nonlinear optics and spectroscopy.

关键词： spectroscopy opposite dipole

Broadband continuous supersymmetric transformation:a new paradigm for transformation optics

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eLight 2022年第1期2卷 203-212页

作者： Jieun Yim Nitish Chandra Xilin Feng Zihe Gao Shuang Wu Tianwei Wu Haoqi Zhao natalia m.litchinitser Liang Feng Department of materials Science and Engineering University of PennsylvaniaPhiladelphiaPA 19104USA Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA Department of Electrical and Systems Engineering University of PennsylvaniaPhiladelphiaPA 19104USA.

Transformation optics has formulated a versatile framework to mold the flow of light and tailor its spatial characteristics at *** its huge success in bringing scientific fiction(such as invisibility cloaking)into reality,the coordinate transformation often yields extreme material parameters unfeasible even with ***,we demonstrate a new transformation paradigm based upon the invariance of the eigenspectra of the Hamiltonian of a physical system,enabled by *** creating a gradient-index metamaterial to control the local index variation in a family of isospectral optical potentials,we demonstrate broadband continuous supersymmetric transformation in optics,on a silicon chip,to simultaneously transform the transverse spatial characteristics of multiple optical states for arbitrary steering and switching of light *** a novel synergy of symmetry physics and metamaterials,our work provides an adaptable strategy to conveniently tame the flow of light with full exploitation of its spatial degree of freedom.

关键词： Supersymmetry Transformation optics metamaterials Integrated photonics

Ultrafast control of fractional orbital angular momentum of microlaser emissions

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Light(Science & Applications) 2020年第1期9卷 286-294页

作者： Zhifeng Zhang Haoqi Zhao Danilo Gomes Pires Xingdu Qiao Zihe Gao Josep *** Stefano Longhi natalia m.litchinitser Liang Feng Department of Electrical and Systems Engineering University of PennsylvaniaPhiladelphiaPA 19104USA Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA Department of materials Science and Engineering University of PennsylvaniaPhiladelphiaPA 19104USA Department of Electrical and Computer Engineering Northeastern UniversityBostonMA 02115USA Dipartimento di Fisica Politecnico di Milano and Istituto di Fotonica e Nanotecnologie del Consiglio Nazionale delle RicerchePiazza L.da Vinci 32I-20133 MilanoItaly Instituto de Fisica Interdisciplinar y Sistemas Complejos IFISC(CSIC-UIB) Palma de MallorcaSpain

On-chip integrated laser sources of structured light carrying fractional orbital angular momentum(FOAm)are highly desirable for the forefront development of optical communication and quantum information-processing *** integrated vortex beam generators have been previously demonstrated in different optical settings,ultrafast control and sweep of FOAm light with low-power control,suitable for high-speed optical communication and computing,remains *** we demonstrate fast control of the FOAm from a vortex semiconductor microlaser based on fast transient mixing of integer laser vorticities induced by a control pulse.A continuous FOAm sweep between charge 0 and charge+2 is demonstrated in a 100 ps time window,with the ultimate speed limit being established by the carrier recombination time in the gain *** results provide a new route to generating vortex microlasers carrying FOAm that are switchable at GHz frequencies by an ultrafast control pulse.

关键词： momentum fractional vortex

Supersymmetric microring laser arrays

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Photonics Research 2019年第3期7卷 363-367页

作者： BIKASHKALI mIDYA HAN ZHAO XINGDU QIAO PEI mIAO WIKTOR WALASIK ZHIFENG ZHANG natalia m.litchinitser LIANG FENG Department of materials Science and Engineering University of Pennsylvania Department of Electrical and Systems Engineering University of Pennsylvania Department of Electrical and Computer Engineering Duke University

A coherent combination of emission power from an array of coupled semiconductor lasers operating on the same chip is of fundamental and technological importance. In general, the nonlinear competition among the array supermodes can entail incoherence and spectral broadening, leading to a spatiotemporally unstable and multimode emission pattern and thus poor beam quality. Here, by harnessing notions from supersymmetric(SUSY)quantum mechanics, we report that the strategic coupling between a class III-V semiconductor microring laser array with its dissipative superpartner can be used to limit the number of supermodes available for laser actions to one. We introduce a novel approach based on second-order SUSY transformation in order to drastically simplify the superpartner array engineering. Compared to a conventional laser array, which has a multimode spectrum, a SUSY laser array is observed to be capable of operating in a single(transverse) supermode. Enhancement of the peak output intensity of the SUSY laser array has been demonstrated with high efficiency and lower lasing threshold, compared with a single laser and a conventional laser array. Our experimental findings pave the way towards broad-area and high-power light generation in a scalable and stable fashion.

关键词： emission power coupled semiconductor lasers operating technological importance

Brain-penetrating neurotrophic factor mimetics: HER-096 as a disease-modifying therapy for Parkinson’s disease

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Neural Regeneration Research 2025年第4期20卷 1094-1095页

作者： natalia Kulesskaya Kira m.Holmström Henri J.Huttunen Herantis Pharma Plc EspooFinland

Neurotrophic factors as a therapeutic approach in neurodegenerative diseases:A major unmet need in the field of central nervous system diseases is disease-modifying *** for decades there have been various symptomatic treatments available to alleviate the symptoms of the disease,disease-modification,*** that stop,significantly delay,or reverse the progression of the disease,has been turned out to a difficult goal to achieve.

关键词： diseases treatment therapeutic

The sudden ocean warming and its potential influences on earlyfrozen landfast ice in the Prydz Bay, East Antarctica

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Acta Oceanologica Sinica 2024年第5期43卷 65-77页

作者： Haihan Hu Jiechen Zhao Jingkai ma Igor Bashmachnikov natalia Gnatiuk Bo Xu Fengming Hui School of Geospatial Engineering and Science Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Key Laboratory of Comprehensive Observation of Polar Environment(Sun Yat-sen University) Ministry of EducationZhuhai 519082China Qingdao Innovation and Development Base(Centre)of Harbin Engineering University Qingdao 266500China Key Laboratory for Polar Acoustics and Application of ministry of Education(Harbin Engineering University) Harbin 150001China Key Laboratory of Research on marine Hazards Forecasting National Marine Environmental Forecasting CentreBeijing 100081China Nansen International Environmental and Remote Sensing Centre St.Petersburg 199034Russia Saint Petersburg State University St.Petersburg 199034Russia Antarctic Great Wall Ecology National Observation and Research Station Polar Research Institute of ChinaShanghai 201209China

The ocean conditions beneath the ice cover play a key role in understanding the sea ice mass balance in the polar *** integrated high-frequency ice-ocean observation system,including Acoustic Doppler Velocimeter,Conductivity-Temperature-Depth Sensor,and Sea Ice mass Balance Array(SImBA),was deployed in the landfast ice region close to the Chinese Zhongshan Station in Antarctica.A sudden ocean warming of 0.14℃(pm(−1.60±0.03)℃during April 16-19 to(−1.46±0.07)℃during April 20-23,2021,which is the only significant warming event in the nearly 8-month *** sudden ocean warming brought a double rise in oceanic heat flux,from(21.7±11.1)W/m^(2) during April 16-19 to(44.8±21.3)W/m^(2) during April 20-23,2021,which shifted the original growth phase at the ice bottom,leading to a 2 cm melting,as shown from SImBA and borehole ***,the slowdown of ice bottom freezing decreased salt rejection,and the daily trend of observed ocean salinity changed from+0.02 d^(-1) during April 16-19,2021 to+0.003 d^(-1) during April 20-23,*** potential reasons are increased air temperature due to the transit cyclones and the weakened vertical ocean mixing due to the tide phase transformation from semi-diurnal to *** high-frequency observations within the ice-ocean boundary layer enhance the comprehensive investigation of the ocean’s influence on ice evolution at a daily scale.

关键词： sudden ocean warming oceanic heat flux landfast ice Zhongshan Station in-situ observation

A class of higher order inverse spectral problems

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Acta mathematica Sinica,English Series 2024年

作者： Ai Wei GUAN Chuan Fu YANG natalia P.BONDARENKO Department of mathematics School of Mathematics and Statistics Nanjing University of Science and Technology S.m. Nikolskii mathematical Institute Peoples’ Friendship University of Russia (RUDN University) moscow Center of Fundamental and Applied mathematics Lomonosov Moscow State University

In this paper, we consider the recovery of third-order differential operators from two spectra, as well as fourth-order or fifth-order differential operators from three spectra, where these differential operators are endowed with complex-valued distributional coefficients. For the case of multiple spectra, we first establish the relationship between spectra and the Weyl-Yurko matrix. Secondly, we prove the uniqueness theorem for the solution of the inverse problems. Our approach allows us to obtain results for the general case of complex-valued distributional coefficients.

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Impact of Transition metal Layer Vacancy on the Structure and Performance of P2 Type Layered Sodium Cathode material

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Nano-micro Letters 2024年第11期16卷 340-358页

作者： Orynbay Zhanadilov Sourav Baiju natalia Voronina Jun Ho Yu A.-Yeon Kim Hun‑Gi Jung Kyuwook Ihm Olivier Guillon Payam Kaghazchi Seung‑Taek myung Department of Nanotechnology and Advanced materials Engineering and Sejong Battery Institute Hybrid Materials Research CenterSejong University98 Gunja‑DongGwangjin‑GuSeoul 05006South Korea Institute of Energy and Climate Research‑materials Synthesis and Processing(IEK‑1) Forschungszentrum Jülich GmbH52425 JülichGermany Center for Energy Storage Research Korea Institute of Science and TechnologySeoul 02792South Korea KIST‑SKKU Carbon‑Neutral Research Center Sungkyunkwan UniversitySuwon 16419South Korea Department of Energy Science Sungkyunkwan UniversitySuwon 16419South Korea Pohang Accelerator Laboratory 80 Jigokro‑127‑BeongilNam‑GuPohangGyeongbuk 37673South Korea mESA+Institute for Nanotechnology University of Twente7500 AE EnschedeThe Netherlands

This study explores the impact of introducing vacancy in the transition metal layer of rationally designed Na_(0.6)[Ni_(0.3)Ru_(0.3)mn_(0.4)]O_(2)(NRm)cathode *** incorporation of Ru,Ni,and vacancy enhances the structural stability during extensive cycling,increases the operation voltage,and induces a capacity increase while also activating oxygen redox,respectively,in Na_(0.7)[Ni_(0.2)V_(Ni0.1)Ru_(0.3)mn_(0.4)]O_(2)(V-NRm)*** analytical techniques including transmission electron microscopy,X-ray absorption near edge spectroscopy,operando X-ray diffraction,and operando differential electrochemical mass spectrometry are employed to assess changes in the average oxidation states and structural *** results demonstrate that V-NRm exhibits higher capacity than NRm and maintains a moderate capacity retention of 81%after 100 ***,the formation of additional lone-pair electrons in the O 2p orbital enables V-NRm to utilize more capacity from the oxygen redox validated by density functional calculation,leading to a widened dominance of the OP4 phase without releasing O_(2) *** findings offer valuable insights for the design of advanced high-capacity cathode materials with improved performance and sustainability in sodium-ion batteries.

关键词： Layered oxide Oxygen evolution Sodium battery Vacancy Cathode

Aging impairs the osteocytic regulation of collagen integrity and bone quality

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Bone Research 2024年第1期12卷 78-94页

作者： Charles A.Schurman Serra Kaya Neha Dole Nadja m.maldonado Luna natalia Castillo Ryan Potter Jacob P.Rose Joanna Bons Christina D.King Jordan B.Burton Birgit Schilling Simon melov Simon Tang Eric Schaible Tamara Alliston Department of Orthopaedic Surgery University of CaliforniaSan FranciscoCA 94143USA UC Berkeley/UCSF Graduate Program in Bioengineering San FranciscoCA 94143USA Buck Institute for Research on Aging NovatoCA 94945USA Washington University in St Louis Department of OrthopedicsSt.LouisMO 63130USA Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA

Poor bone quality is a major factor in skeletal fragility in elderly *** molecular mechanisms that establish and maintain bone quality,independent of bone mass,are unknown but are thought to be primarily determined by *** hypothesize that the age-related decline in bone quality results from the suppression of osteocyte perilacunar/canalicular remodeling(PLR),which maintains bone material *** examined bones from young and aged mice with osteocyte-intrinsic repression of TGFβsignaling(TβRII^(ocy−/−))that suppresses *** control aged bone displayed decreased TGFβsignaling and PLR,but aging did not worsen the existing PLR suppression in male TβRII^(ocy−/−)*** relationship impacted the behavior of collagen material at the nanoscale and tissue scale in macromechanical *** effects of age on bone mass,density,and mineral material behavior were independent of osteocytic TGFβ.We determined that the decline in bone quality with age arises from the loss of osteocyte function and the loss of TGFβ-dependent maintenance of collagen integrity.

关键词： maintain primarily integrity