检索结果-内蒙古大学图书馆

arXiv 2021年

作者： Liu, Defa F. Le, C.C. Wang, H.Y. Zhang, X. Kumar, N. Shekhar, C. Schröter, N.B.M. Li, Y.W. Pei, D. Xu, L.X. Dudin, P. Kim, T.K. Cacho, C. Fujii, J. Vobornik, I. Yang, L.X. Liu, Z.K. Guo, Y.F. Hu, J.P. Felser, C. Parkin, S.S.P. Chen, Y.L. Max Planck Institute of Microstructure Physics Halle06120 Germany School of Physical Science and Technology ShanghaiTech University Shanghai201210 China Max Planck Institute for Chemical Physics of Solids DresdenD-01187 Germany Clarendon Laboratory Department of physics University of Oxford OxfordOX1 3PU United Kingdom Diamond Light Source DidcotOX110DE United Kingdom CNR-IOM TASC Laboratory in Area Science Park Trieste34139 Italy State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Frontier Science Center for Quantum Information Beijing100084 China ShanghaiTech Laboratory for Topological Physics Shanghai200031 China Institute of Physics Chinese Academy of Sciences Beijing100190 China

Dirac semimetals (DSMs) are classified into different phases based on the types of the Dirac fermions. Tuning the transition among different types of the Dirac fermions in one system remains challenging. Recently, KMgBi was predicted to be located at a critical state that various types of Dirac fermions can be induced owing to the existence of a flat band. Here, we carried out systematic studies on the electronic structure of KMgBi single crystal by combining angle-resolve photoemission spectroscopy (ARPES) and scanning tunneling microscopy/spectroscopy (STM/STS). The flat band was clearly observed near the Fermi level. We also revealed a small bandgap of ~ 20 meV between the flat band and the conduction band. These results demonstrate the critical state of KMgBi that transitions among various types of Dirac fermions can be tuned in one system. Copyright © 2021, The Authors. All rights reserved.

关键词： Scanning tunneling microscopy

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Photocatalytic Dissociation of CH3OH on ZnO(0001) Surface

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Chinese Journal of chemical physics 2019年第5期32卷 525-530页

作者： Peng-xiao Liang Fei Xu Zhen-xing Li Zhi-wen Luan Xing-an Wang Qing Guo Xue-ming Yang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics University of Science and Technology of China Hefei 230026 China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Department of Chemistry School of Science Southern University of Science and Technology Shenzhen 518055 China

Photocatalysis of CH3OH on the ZnO(0001) surface has been investigated by using temperature-programmed desorption (TPD) method with a 266 nm laser light. TPD results show that part of the CH3OH adsorbed on ZnO(0001) surface are in molecular form, while others are dissociated. The thermal reaction products of H2, CH3·, H2O, CO, CH2O, CO2 and CH3OH have been detected. Experiments with the UV laser light indicate that the irradiation can promote the dissociation of CH3OH/CH3O· to form CH2O, which can be fu- ture converted to HCOO- during heating or illumination. The reaction between CH3OHZn and OHad can form the H2O molecule at the Zn site. Both temperature and illumination promote the desorption of CH3· from CH3O·. The research provides a new insight into the photocatalytic reaction mechanism of CH3OH on ZnO(0001).

关键词： Methanol Photocatalysis ZnO(0001) surface Temperature-programmed desorption

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Commissioning of the camera of the first Large Size Telescope of the Cherenkov Telescope Array 37

Commissioning of the camera of the first Large Size Telescop...

引用

37th International Cosmic Ray Conference, ICRC 2021

作者： Saito, T. Delgado, C. Blanch, O. Artero, M. Barrio, J.A. Cassol, F. Diaz, C. Hadasch, D. Hoffmann, D. Houles, J. Inome, Y. Iori, M. Jouvin, L. Kerszberg, D. Kobayashi, Y. Kubo, H. Martinez, G. Mazin, D. Moretti, E. Nakamori, T. Nozaki, S. Oka, T. Okumura, A. Palatiello, M. Polo, M. Prast, J. Sakurai, S. Sunada, Y. Takahashi, M. Takeishi, R. Tejedor, L.A. Yamamoto, T. Yoshida, T. Abe, H. Aguasca, A. Agudo, I. Antonelli, L.A. Aramo, C. Armstrong, T. Asano, K. Ashkar, H. Aubert, P. Baktash, A. Bamba, A. Baquero Larriva, A. Baroncelli, L. Barres de Almeida, U. Batkovic, I. Becerra González, J. Bernardos, M.I. Berti, A. Biederbeck, N. Bigongiari, C. Bonnoli, G. Bordas, P. Bose, D. Bulgarelli, A. Burelli, I. Buscemi, M. Cardillo, M. Caroff, S. Carosi, A. Cerruti, M. Chai, Y. Cheng, K. Chikawa, M. Chytka, L. Contreras, J.L. Cortina, J. Costantini, H. Dalchenko, M. De Angelis, A. de Bony de Lavergne, M. Deleglise, G. Delgado Mengual, J. della Volpe, D. Depaoli, D. Di Pierro, F. Di Venere, L. Dominik, R.M. Dominis Prester, D. Donini, A. Dorner, D. Doro, M. Elsässer, D. Emery, G. Escudero, J. Fiasson, A. Foffano, L. Fonseca, M.V. Freixas Coromina, L. Fukami, S. Fukazawa, Y. Garcia, E. Garcia López, R. Giglietto, N. Giordano, F. Gliwny, P. Godinovic, N. Green, D. Grespan, P. Gunji, S. Hackfeld, J. Hahn, A. Hassan, T. Hayashi, K. Heckmann, L. Heller, M. Herrera Llorente, J. Hirotani, K. Horns, D. Hrabovsky, M. Hrupec, D. Hui, D. Hütten, M. Inada, T. Ishio, K. Iwamura, Y. Jacquemont, M. Jimenez Martinez, I. Jurysek, J. Kagaya, M. Karas, V. Katagiri, H. Kataoka, J. Kong, A. Kushida, J. Lamanna, G. Lamastra, A. Le Flour, T. Longo, F. López-Coto, R. López-Moya, M. López-Oramas, A. Luque-Escamilla, P.L. Majumdar, P. Makariev, M. Mandat, D. Manganaro, M. Mannheim, K. Mariotti, M. Marquez, P. Marsella, G. Martí, J. Martinez, O. Martínez, M. Marusevec, P. Mas, A. Maurin, G. Mestre Guillen, E. Micanovic, S. Miceli, D. Miener, T. Miranda, J.M. ICRR Institute for Cosmic Ray Research University of Tokyo 5-1-5 Kashiwa-no-ha Chiba Kashiwa277-8582 Japan CIEMAT Avda. Complutense 40 Madrid28040 Spain The Barcelona Institute of Science and Technology Bellaterra Campus UAB Barcelona08193 Spain EMFTEL Department IPARCOS Universidad Complutense de Madrid Madrid28040 Spain Aix-Marseille Université CNRS IN2P3 CPPM 163 Avenue de Luminy MarseilleCedex 09 13288 France INFN Sezione di Roma La Sapienza P.le Aldo Moro 2 Roma00185 Italy Division of Physics and Astronomy Graduate School of Science Kyoto University Sakyo-ku Kyoto606-8502 Japan Department of Physics Yamagata University Yamagata990-8560 Japan ISEE Nagoya University Chikusa-ku Nagoya464-8602 Japan Graduate School of Science and Engineering Saitama University 255 Simo-Ohkubo Sakura-ku Saitama338-8570 Japan CNRS Laboratoire d'Annecy de Physique des Particules IN2P3 Univ. Grenoble Alpes Univ. Savoie Mont Blanc Annecy74000 France Department of Physics Konan University Hyogo Kobe658-8501 Japan Faculty of Science Ibaraki University Ibaraki Mito310-8512 Japan Departament de Física Quàntica i Astrofísica Institut de Ciències del Cosmos Universitat de Barcelona IEEC-UB Spain Instituto de Astrofísica de Andalucía CSIC Spain INAF - Osservatorio Astronomico di Roma Italy INFN Sezione di Napoli Italy IRFU CEA Université Paris-Saclay France Universität Hamburg Institut für Experimentalphysik Germany Graduate School of Science University of Tokyo Japan INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna Italy Centro Brasileiro de Pesquisas Físicas Brazil INFN Sezione di Padova Università degli Studi di Padova Italy Instituto de Astrofísica de Canarias Departamento de Astrofísica Universidad de La Laguna Spain Max-Planck-Institut für Physik Germany Department of Physics TU Dortmund University Germany Saha Institute of Nuclear Physics India INFN Sezione di Trieste Università degli Studi di Udine Italy INFN Sezio

The first Large Size Telescope (LST-1) of the Cherenkov Telescope Array has been operational since October 2018 at La Palma, Spain. We report on the results obtained during the camera commissioning. The noise level of the readout is determined as a 0.2 p.e. level. The gain of PMTs are well equalized within 2% variation, using the calibration flash system. The effect of the night sky background on the signal readout noise as well as the PMT gain estimation are also well evaluated. Trigger thresholds are optimized for the lowest possible gamma-ray energy threshold and the trigger distribution synchronization has been achieved within 1 ns precision. Automatic rate control realizes the stable observation with 1.5% rate variation over 3 hours. The performance of the novel DAQ system demonstrates a less than 10% dead time for 15 kHz trigger rate even with sophisticated online data correction. © 2022 Sissa Medialab Srl. All rights reserved.

关键词： Cameras

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Exotic magnetic and electronic properties of layered CrI3 single crystals under high pressure

arXiv

引用

arXiv 2021年

作者： Ghosh, Anirudha Singh, D. Mu, Qingge Kvashnin, Y. Haider, G. Jonak, M. Chareev, D. Aramaki, T. Medvedev, S.A. Klingeler, R. Mito, M. Abdul-Hafidh, E.H. Vejpravova, J. Kalbàč, M. Ahuja, R. Eriksson, Olle Abdel-Hafiez, Mahmoud Uppsala University Department of Physics and Astronomy Box 516 UppsalaSE-751 20 Sweden Max Planck Institute for Chemical Physics of Solids DresdenD-01187 Germany J. Heyrovsky Institute of Physical Chemistry The Czech Academy of Sciences Dolejškova 2155 Prague182 23 Czech Republic Kirchhoff Institute of Physics Heidelberg University Heidelberg Germany National University of Science and Technology"MISiS" Moscow119049 Russia Graduate School of Engineering Kyushu Institute of Technology Fukuoka804-8550 Japan Physics Department Faculty of Science Taibah University-Yanbu King Khalid Rd. Al Amoedi Yanbu El-Bahr51000 46423 Saudi Arabia Department of Condensed Matter Physics Faculty of Mathematics and Physics Charles University Ke Karlovu 5 Prague 2121 16 Czech Republic School of Science and Technology Örebro University ÖrebroSE-701 82 Sweden

Through advanced experimental techniques on CrI3 single crystals, we derive a previously not discussed pressure-temperature phase diagram. We find that Tc increases to ∼ 66 K with pressure up to ∼ 3 GPa followed by a decrease to ∼ 10 K at 21.2 GPa. The experimental results are reproduced by theoretical calculations based on density functional theory where electron-electron interactions are treated by a static on-site Hubbard U on Cr 3d orbitals. The origin of the pressure induced reduction of the ordering temperature is associated with a decrease of the calculated bond angle, from 95◦ at ambient pressure to ∼ 85◦ at 25 GPa. Above 22 GPa, the magnetically ordered state is essentially quenched, possibly driving the system to a Kitaev spin-liquid state at low temperature, thereby opening up the possibility of further exploration of long-range quantum entanglement between spins. The pressure-induced semiconductor-to-metal phase transition was revealed by high-pressure resistivity that is accompanied by a transition from a robust ferromagnetic state to gradually more dominating anti-ferromagnetic interactions and was consistent with theoretical modeling. © 2021, CC BY.

关键词： Single crystals

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Gamma-ray emission from the Sagittarius Dwarf Spheroidal galaxy due to millisecond pulsars

arXiv

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arXiv 2022年

作者： Crocker, Roland M. Macias, Oscar Mackey, Dougal Krumholz, Mark R. Ando, Shin'ichiro Horiuchi, Shunsaku Baring, Matthew G. Gordon, Chris Venville, Thomas Duffy, Alan R. Yang, Rui-Zhi Aharonian, Felix Hinton, J.A. Song, Deheng Ruiter, Ashley J. Filipović, Miroslav D. Research School of Astronomy and Astrophysics Australian National University CanberraACT2611 Australia GRAPPA − Gravitational and Astroparticle Physics Amsterdam University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands UTIAS The University of Tokyo Chiba Kashiwa277-8583 Japan Center for Neutrino Physics Department of Physics Virginia Tech BlacksburgVA24061 United States Department of Physics and Astronomy - MS 108 Rice University 6100 Main Street HoustonTX77251-1892 United States School of Physical and Chemical Sciences University of Canterbury Christchurch New Zealand Centre for Astrophysics and Supercomputing Swinburne University of Technology PO Box 218 HawthornVIC3122 Australia Department of Astronomy School of Physical Sciences University of Science and Technology of China Anhui Hefei230026 China CAS Key Labrotory for Research in Galaxies and Cosmology University of Science and Technology of China Anhui Hefei230026 China School of Astronomy and Space Science University of Science and Technology of China Anhui Hefei230026 China Max-Planck-Institut für Kernphysik Saupfercheckweg 1 Heidelberg69117 Germany Dublin Institute for Advanced Studies 31 Fitzwilliam Place Dublin 2 Ireland School of Science University of New South Wales Canberra The Australian Defence Force Academy CanberraACT2600 Australia Western Sydney University Locked Bag 1797 South DC PenrithNSW2751 Australia

The Fermi Bubbles are giant, γ-ray emitting lobes emanating from the nucleus of the Milky Way[1, 2] discovered in ∼ 1-100 GeV data collected by the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope[3]. Previous work[4] has revealed substructure within the Fermi Bubbles that has been interpreted as a signature of collimated outflows from the Galaxy’s super-massive black hole. Here we show via a spatial template analysis that much of the γ-ray emission associated to the brightest region of substructure – the so-called cocoon – is likely due to the Sagittarius dwarf spheroidal (Sgr dSph) galaxy. This large Milky Way satellite is viewed through the Fermi Bubbles from the position of the Solar System. As a tidally and ram-pressure stripped remnant, the Sgr dSph has no on-going star formation, but we nevertheless demonstrate that the dwarf’s millisecond pulsar (MSP) population can plausibly supply the γ-ray signal that our analysis associates to its stellar template. The measured spectrum is naturally explained by inverse Compton scattering of cosmic microwave background photons by high-energy electron-positron pairs injected by MSPs belonging to the Sgr dSph, combined with these objects’ magnetospheric emission. This finding plausibly suggests that MSPs produce significant γ-ray emission amongst old stellar populations, potentially confounding indirect dark matter searches in regions such as the Galactic Centre, the Andromeda galaxy, and other massive Milky Way dwarf spheroidals. © 2022, CC BY.

关键词： Gamma rays

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High-loading and thermally stable Pt1/MgAl1.2Fe0.8O4 single-atom catalysts for high-temperature applications

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science China Materials 2020年第6期63卷 949-958页

作者： Kaipeng Liu Yan Tang Zhiyang Yu Binghui Ge Guoqing Ren Yujing Ren Yang Su Jingcai Zhang Xiucheng Sun Zhiqiang Chen Aiqin W ang Jun Li CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry&Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua UniversityBeijing 100084China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350002China Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China

Single-atom catalysts(SACs)have attracted extensive attention in the field of heterogeneous ***,the fabrication of SACs with high loading and hightemperature stability remains a grand challenge,especially on oxide *** this work,we have demonstrated that through strong covalent metal-support interaction,highloading and thermally stable single-atom Pt catalysts can be readily prepared by using Fe modified spinel as *** catalytic performance in N2O decomposition reaction is obtained on such SACs than their nanocatalyst counterpart and low-surface-area Fe2O3 supported Pt *** work provides a strategy for the fabrication of high-loading and thermally stable SACs for applications at high temperatures.

关键词： high loading thermal stability single-atom catalyst strong covalent metal-support interaction N20 decomposition

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The phase transition in copper pyrophosphate, Cu2P2O7: Insights and implications for the interpretation of negative thermal expansion

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Matter 2025年

作者： Dove, Martin T. Shi, Naike School of Mechanical Engineering Guizhou University of Engineering Science Guizhou Bijie551700 China Institute of Atomic and Molecular Physics Sichuan University Sichuan Chengdu610065 China School of Physical and Chemical Sciences Queen Mary University of London Mile End Road LondonE1 4NS United Kingdom Department of Physical Chemistry University of Science and Technology Beijing Beijing100083 China School of Materials Science and Engineering Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore

The origin of negative thermal expansion (NTE) in Cu2P2O7 has been examined using diffraction data at ambient and raised pressure. From an analysis of spontaneous strains and order parameters associated with the structural phase transition, we show that the NTE can be explained wholly on the basis of the structural distortions that accompany the phase transition. We demonstrate that the NTE diverges at the phase transition, because the phase transition shows tricritical behavior. The unusual aspect of the phase transition is that it gives rise to an expansion on cooling, whereas normally, a structural phase transition leads to an overall volume reduction. This behavior, which we identify as a uniaxial spontaneous strain, can be understood in terms of ordering of pairs of long Cu–O bonds associated with buckling of the atomic layers in the crystal structure. We demonstrate that the NTE is enhanced under pressure. © 2025 The Authors

关键词： Crystal atomic structure

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A Photosensitive Composition Based on an Aromatic Polyamide for Lcd 4d Printing of Shape Memory Mechanically Robust Materials

SSRN

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SSRN 2022年

作者： Kholkhoev, Bato Ch. Bardakova, Kseniia N. Epifanov, Evgeniy O. Matveev, Zakhar A. Shalygina, Taisiya A. Atutov, Evgeniy B. Voronina, Svetlana Yu. Timashev, Peter S. Burdukovskii, Vitaliy F. Baikal institute of Nature Management Siberian Branch Russian Academy of Sciences 6 Sakhyanovoy str. Ulan-Ude670047 Russia Institute of Photonic Technologies Research center "Crystallography and Photonics" Russian Academy of Sciences 2 Pionerskaya str. Troitsk Moscow108840 Russia Institute for Regenerative Medicine Sechenov University 8-2 Trubetskaya str. Moscow119991 Russia Reshetnev Siberian State University of Science and Technology 31 Krasnoyarsky Rabochy Av. Krasnoyarsk660037 Russia Institute of Physical Materials Science Siberian Branch Russian Academy of Sciences 6 Sakhyanovoy str. Ulan-Ude670047 Russia Semenov Institute of Chemical Physics Russian Academy of Sciences 4 Kosygina str. Moscow119991 Russia Lomonosov Moscow State University Chemical Department 1-3 Leninskiye Gory Moscow119991 Russia

High-temperature shape memory polymers (SMPs) draw growing interest from researchers due to their potential as materials for application in the ﬁeld of high-temperature smart devices. However, in the majority of cases the processing of high-temperature SMPs is limited by fabrication of two-dimensional ﬁlms. Here, we have prepared a photosensitive composition based on high-performance heat resistant poly-N,N'-( m -phenylene)isophthalamide (MPA) and photosensitive components (N,N-dimethylacrylamide and bisphenol A ethoxylate diacrylate (BAEDA)). It has been shown by IR spectroscopy, that LCD 3D printing followed by post-curing at 150°C results in the formation of semi-interpenetrating polymer networks, while thermal processing at a temperature ≥200°C leads to the formation of fully crosslinked structures due to the interaction of NH groups from MPA and acrylic groups from BAEDA via the Michael addition. The post-curing temperature has a significant effect on the thermal and mechanical properties of materials. Thermal post-curing of 3D printed samples at 250°C for 1 hour results in the fabrication of materials with the highest tensile strength (92.4±6.1 MPa), glass transition temperature (148°C) and thermal decomposition temperature (above 350°C). Remarkably, MPA-based materials exhibit an excellent shape memory performance at temperatures >150°C, with fixity ratio (R f ) of 99.7% and recovery ratio (R r ) of 99.9%. Moreover, we showed that the glass transition temperature decreased by no more than 1% after γ-radiation of 200 Gy. In addition, the material maintains a high storage modulus and good shape memory performance after being irradiated, and thus has a great potential in the field of aerospace structural materials. © 2022, The Authors. All rights reserved.

关键词： Temperature

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Reconstructing the Coordination Environment of Fe/Co Dual-atom Sites towards Efficient Oxygen Electrocatalysis for Zn–Air Batteries

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Angewandte Chemie 2024年第7期137卷

作者： Hengqi Liu Jinzhen Huang Kun Feng Rui Xiong Shengyu Ma Ran Wang Prof. Qiang Fu Moniba Rafique Prof. Zhiguo Liu Prof. Jiecai Han Daxing Hua Prof. Jiajie Li Prof. Jun Zhong Prof. Xianjie Wang Prof. Zhonglong Zhao Tai Yao Prof. Sida Jiang Prof. Ping Xu Prof. Zhihua Zhang Prof. Bo Song National Key Laboratory of Laser Spatial Information Harbin Institute of Technology Harbin 150001 China School of Physics Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150001 China Electrochemistry Laboratory Paul Scherrer Institute CH-5232 Villigen PSI Switzerland Institute of Functional Nano and Soft Materials Laboratory Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Suzhou 215123 China School of future technology Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering University of Jinan Jinan 250022 China School of Physical Science and Technology Inner Mongolia University Hohhot 010021 China National Key Laboratory of Space Environment and Matter Behaviors Harbin Institute of Technology Harbin 150001 China State Key Laboratory of Space Power-Sources School of Chemistry Chemical Engineering Harbin Institute of Technology Harbin 150001 China School of Materials Science Engineering Dalian Jiaotong University Dalian 116028 China Laboratory for Space Environment and Physical Sciences Frontiers Science Center for Matter Behave in Space Environment Harbin Institute of Technology Harbin 150001 China Zhengzhou Research Institute Harbin Institute of Technology Zhengzhou 450046 China

Dual-atom catalysts with nitrogen-coordinated metal sites embedded in carbon can drive the oxygen reduction and evolution reactions (ORR/OER) in rechargeable zinc–air batteries (ZABs), and the further improvement is limited by the linear scaling relationship of intermediate binding energies in the absorbate evolution mechanism (AEM). Triggering the lattice oxygen mechanism (LOM) is promising to overcome this challenge, but has yet been verified since the lacking of bridge oxygen (O) in the rigid coordination environment of the metal centers. Here, we demonstrate that suitably tailored dual-atom catalysts of FeCo−N−C can undergo out-plane and in-plane reconstruction to form the both axial O and bridge O at the metal centers, and thus activate the LOM pathway. The tailored FeCo−N−C with shortened Fe−N bonds also favors the ORR process, therefore is a promising dual-atom oxygen catalyst. The assembled rechargeable ZABs demonstrate a peak power density of 332 mW cm −2 , and exhibit no notable decline after ~720 h of continuous cycling.

关键词： Tailoring coordination environment lattice oxygen mechanism oxygen evolution reaction oxygen reduction reaction rechargeable zinc–air batteries

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Manipulating Fano coupling in an opto-thermoelectric field

arXiv

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arXiv 2024年

作者： Lin, Linhan Lepeshov, Sergey Krasnok, Alex Huang, Yu Jiang, Taizhi Peng, Xiaolei Korgel, Brian A. Alu, Andrea Zheng, Yuebing State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China Department of Electrical and Photonics Engineering DTU Electro Technical University of Denmark Building 343 Kgs. LyngbyDK-2800 Denmark Department of Electrical and Computer Engineering Florida International University MiamiFL33174 United States School of Physics and Electronics Hunan University Changsha410082 China Mc Ketta Department of Chemical Engineering The University of Texas at Austin AustinTX78712 United States Materials Science & Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712 United States Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York NY10016 United States Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

Fano resonances in photonics arise from the coupling and interference between two resonant modes in structures with broken symmetry. They feature an uneven and narrow and tunable lineshape, and are ideally suited for optical spectroscopy. Many Fano resonance structures have been suggested in nanophotonics over the last ten years, but reconfigurability and tailored design remain challenging. Herein, we propose an all-optical "pick-and-place" approach aimed at assemble Fano metamolecules of various geometries and compositions in a reconfigurable manner. We study their coupling behavior by in-situ dark-field scattering spectroscopy. Driven by a light-directed opto-thermoelectric field, silicon nanoparticles with high quality-factor Mie resonances (discrete states) and low-loss BaTiO3 nanoparticles (continuum states) are assembled into all-dielectric heterodimers, where distinct Fano resonances are observed. The Fano parameter can be adjusted by changing the resonant frequency of the discrete states or the light polarization. We also show tunable coupling strength and multiple Fano resonances by altering the number of continuum states and discrete states in dielectric heterooligomers. Our work offers a general design rule for Fano resonance and an all-optical platform for controlling Fano coupling on demand. Copyright © 2024, The Authors. All rights reserved.

关键词： Light polarization

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