检索结果-南通市图书馆

Nanooptics of Subnanometric Plasmonic Gaps

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nanooptics of Subnanometric Plasmonic Gaps

A plasmonic route for the integrated wireless communication of subdiffraction-limited signals

第十八届全国光散射学术会议

作者： Javier Aizpurua Center for Materials Physics （CSIC-UPV/EHU） and DIPC Paseo Manuel Lardizabal 5

＜正＞Plasmonic nanogaps are formed at the junction of two metallic interfaces providing a great opportunity to explore atomic-scale morphologies and complex photochemical processes by optical means,thanks to the excitation of intense surface plasmonic modes[1].In recent years,optical spectroscopy of these cavities has

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Light(Science & Applications) 2020年第1期9卷 930-938页

作者： Hao Chi Zhang Le Peng Zhang Pei Hang He Jie Xu Cheng Qian Francisco J.Garcia-Vidal Tie Jun Cui State Key Laboratory of Millimeter Waves Southeast University210096 NanjingChina Departamento de Fisica Teorica de la Materia Condensada and Condensed Matter Physics Center(IFIMAC) Universidad Autonoma de MadridMadridSpain Donostia International Physics Center(DIPC) Donostia/San SebastianSpain

Perfect lenses,superlenses and time-reversal mirrors can support and spatially separate evanescent waves,which is the basis for detecting subwavelength information in the far field.However,the inherent limitations of these methods have prevented the development of systems to dynamically distinguish subdiffraction-limited signals.Utilizing the physical merits of spoof surface plasmon polaritons(SPPs),we demonstrate that subdiffraction-limited signals can be transmitted on planar integrated SPP channels with low loss,low channel interference,and high gain and can be radiated with a very low environmental sensitivity.Furthermore,we show how deep subdiffraction-limited signals that are spatially coupled can be distinguished after line-of-sight wireless transmission.For a visualized demonstration,we realize the high-quality wireless communication of two movies on subwavelength channels over the line of sight in real time using our plasmonic scheme,showing significant advantages over the conventional methods.

关键词： communication spatially diffraction

Efficient passivation of DY center in CH_(3)NH_(3)PbBr_(3) by chlorine:Quantum molecular dynamics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2022年第3期15卷 2112-2122页

作者： Ran Shi Wei-Hai Fang Andrey S.Vasenko Run Long Oleg V.Prezhdo College of Chemistry Key Laboratory of Theoretical&Computational Photochemistry of Ministry of EducationBeijing Normal UniversityBeijing 100875China National Research University Higher School of Economics(HSE)University 101000 MoscowRussia Donostia International Physics Center(DIPC) Paseo Manuel de Lardizabal 4San Sebastián/Donostia20018 Basque CountrySpain Department of Chemistry University of Southern CaliforniaLos AngelesCA 90089USA

MAPbBr_(3)(MA=CH_(3)NH_(3)^(+))doping with bismuth increases electric conductivity,charge carrier density and photostability,reduces toxicity,and expands light absorption.However,Bi doping shortens excited-state lifetimes due to formation of DY−charge recombination centers.Using nonadiabatic molecular dynamics and time-domain density functional theory,we demonstrate that the DY−center forms a deep,highly localized hole trap,which accelerates nonradiative relaxation ten-fold and is responsible for 90%of carrier losses.Hole trapping occurs by coupling between the valence band and the trap state,facilitated by the Br atoms surrounding the Bi dopant.Passivation of the DY−center with chlorines heals the local geometry distortion,eliminates the trap state,and makes the carrier lifetimes longer than even in pristine MAPbBr_(3).The decreased charge recombination arises from reduced nonadiabatic coupling and shortened coherence time,due to diminished electron–hole overlap around the passivated defect.Our study demonstrates accelerated nonradiative recombination in Bi-doped MAPbBr_(3),suggests a strategy for defect passivation and reduction of nonradiative energy losses,and provides atomistic insights into unusual defect properties of metal halide perovskites needed for rational design of high-performance perovskite solar cells and optoelectronic devices.

关键词： Hybrid organic-inorganic perovskite DY−center and Cl passivation charge trapping and recombination nonadiabatic molecular dynamics time-domain density functional theory.

Ultrafast laser-driven topological spin textures on a 2D magnet

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2022年第1期8卷 1630-1635页

作者： Mara Strungaru Mathias Augustin Elton J.G.Santos Institute for Condensed Matter Physics and Complex Systems School of Physics and AstronomyThe University of EdinburghEdinburghEH93FDUK Donostia International Physics Center(DIPC) 20018Donostia-San SebastiánBasque CountrySpain Higgs Centre for Theoretical Physics The University of EdinburghEdinburghEH93FDUK

Ultrafast laser excitations provide an efficient and low-power consumption alternative since different magnetic properties and topological spin states can be triggered and manipulated at the femtosecond(fs)regime.However,it is largely unknown whether laser excitations already used in data information platforms can manipulate the magnetic properties of recently discovered two-dimensional(2D)van der Waals(vdW)materials.Here we show that ultrashort laser pulses(30−85 fs)can not only manipulate magnetic domains of 2D-XY CrCl_(3)ferromagnets,but also induce the formation and control of topological nontrivial meron and antimeron spin textures.We observed that these spin quasiparticles are created within~100 ps after the excitation displaying rich dynamics through motion,collision and annihilation with emission of spin waves throughout the surface.Our findings highlight substantial opportunities of using photonic driving forces for the exploration of spin textures on 2D magnetic materials towards magneto-optical topological applications.

关键词： laser excitation topological

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

高压下新型超硬富硼氮化物

Science China Materials 2020年第11期63卷 2358-2364页

作者：王林妍孙荣鑫刘雯慧袁智康 Aitor Bergara 梁笑微陈帅周向锋徐波何巨龙于栋利高国英田永君 Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Departmento de Física de la Materia Condensada Universidad del País VascoUPV/EHUUPV/EHU48080 BilbaoSpain Donostia International Physics Center(DIPC) 20018 DonostiaSpain Centro de Física de Materiales CFM Centro Mixto CSIC-UPV/EHU20018 DonostiaSpain

富硼化合物通常为潜在的超硬材料,尽管之前的研究提出了不同晶型的BN超硬材料,但尚未发现超硬的富硼氮化物.本文采用基于粒子群优化算法的结构预测方法,结合第一性原理计算,对富硼氮化物在压力下的稳定成分及结构进行系统研究.结果表明,... 详细信息

富硼化合物通常为潜在的超硬材料,尽管之前的研究提出了不同晶型的BN超硬材料,但尚未发现超硬的富硼氮化物.本文采用基于粒子群优化算法的结构预测方法,结合第一性原理计算,对富硼氮化物在压力下的稳定成分及结构进行系统研究.结果表明,在B4N、B6N和B8N中,硼原子都能够形成B12二十面体.在0–20 GPa压力范围内,B6N是热力学稳定的,而B4N和B8N是亚稳的.电子性质计算表明,预测的Cmca B6N和Immm B6N为半导体,其他均为金属.声子和弹性常数计算表明,所有预测结构都具有动力学稳定性和机械稳定性.值得关注的是,B4N和B6N的维氏硬度分别为45和42 GPa,表明其为潜在的超硬材料.此研究丰富了B-N体系相图,并为实验上探索超硬材料提供了丰富的理论指导.

关键词：超硬材料机械稳定性动力学稳定性粒子群优化算法热力学稳定硼化合物氮化物二十面体

Design of active and stable catalysts by embedding nitrogen-doped carbon oxygen reduction reaction CoxOy nanoparticles into

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第1期10卷 97-107页

作者： Fan Yang Mikel Abadia Chaoqiu Chen Weike Wang Le Li Lianbing Zhang Celia Rogero Andrey Chuvilin Mato Knez CIC nanoGUNE Consofider Tolosa Hifibidea 76 20018 Donostia-San Sebastian Spain Centro de Fisica de Materials CFM/MPC (CSIC-UPV/EHU) Paseo Manuel de Lardizabal 5 20018 Donostia-San Sebastian Spain School of Life Sciences Northwestern Polytechnical University Xi'an 710072 China Donostia International Physics Center (DIPC) Paseo Manuel de Lardizabal 4 20018 Donostia-San Sebastian Spain IKERBASQUE Basque Foundation for Science Maria Diaz de Haro 3 48013 Bilbao Spain

The oxygen reduction reaction （ORR） is essential in research pertaining to life science and energy. In applications, platinum-based catalysts give ideal reactivity, but, in practice, are often subject to high costs and poor stability. Some costefficient transition metal oxides have exhibited excellent ORR reactivity, but the stability and durability of such alternative catalyst materials pose serious challenges. Here, we present a facile method to fabricate uniform CoxOy nanoparticles and embed them into N-doped carbon, which results in a composite of extraordinary stability and durability, while maintaining its high reactivity. The half-wave potential shows a negative shift of only 21 mV after 10,000 cycles, only one third of that observed for Pt/C （63 mV）. Furthermore, after 100,000 s testing at a constant potential, the current decreases by only 17%, significantly less than for Pt/C （35%）. The exceptional stability and durability results from the system architecture, which comprises a thin carbon shell that prevents agglomeration of the CoxOy nanoparticles and their detaching from the substrate.

关键词： atomic layer deposition,cobalt oxide,polydopamine,oxygen reduction reaction

Pressure-induced evolution of stoichiometries and electronic structures of host-guest Na-B compounds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2023年第6期8卷 101-110页

作者： Zixuan Guo Xing Li Aitor Bergara Shicong Ding Xiaohua Zhang Guochun Yang State Key Laboratory of Metastable Materials Science&Technology and Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China Departamento de Física and EHU-Quantum Center Universidad del País Vasco-Euskal Herriko UnibertsitateaUPV/EHU48080 BilbaoSpain Donostia International Physics Center(DIPC) 20018 DonostiaSpain Centro de Física de Materiales CFM Centro Mixto CSIC-UPV/EHU20018 DonostiaSpain

Superionic and electride behaviors in materials,which induce a variety of exotic physical properties of ions and electrons,are of great importance both in fundamental research and for practical applications.However,their coexistence in hot alkali-metal borides has not been observed.In this work,we apply first-principles structure search calculations to identify eight Na-B compounds with host-guest structures,which exhibit a wide range of building blocks and interesting properties linked to the Na/B composition.Among the known borides,Na-rich Na9B stands out as the composition with the highest alkali-metal content,featuring vertex-and face-sharing BNa16 polyhedra.Notably,it exhibits electride characteristics and transforms into a superionic electride at 200 GPa and 2000 K,displaying unusual Na atomic diffusion behavior attributed to the modulation of the interstitial anion electrons.It demonstrates semiconductor behavior in the solid state,and metallic properties associated with Na 3p/3s states in the superionic and liquid regions.On the other hand,B-rich NaB7,consisting of a unique covalent B framework,is predicted to exhibit low-frequency phonon-mediated superconductivity with a T_(c) of 16.8 K at 55 GPa.Our work advances the understanding of the structures and properties of alkali-metal borides.

关键词： alkali structures compounds

Exploring van der Waals materials with high anisotropy:geometrical and optical approaches

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第4期13卷 645-653页

作者： Aleksandr S.Slavich Georgy A.Ermolaev Mikhail K.Tatmyshevskiy Adilet N.Toksumakov Olga G.Matveeva Dmitriy V.Grudinin Kirill V.Voronin Arslan Mazitov Konstantin V.Kravtsov Alexander V.Syuy Dmitry M.Tsymbarenko Mikhail S.Mironov Sergey M.Novikov Ivan Kruglov Davit A.Ghazaryan Andrey A.Vyshnevyy Aleksey V.Arsenin Valentyn S.Volkov Kostya S.Novoselov Moscow Center for Advanced Studies Kulakova str.20Moscow 123592Russia. Emerging Technologies Research Center XPANCEOInternet CityEmmay TowerDubaiUnited Arab Emirates. Donostia International Physics Center(DIPC) Donostia/San-Sebastián 20018Spain. Institute of Materials Ecole Polytechnique Federale de Lausanne1015 LausanneSwitzerland. Department of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia. Laboratory of Advanced Functional Materials Yerevan State UniversityYerevan 0025Armenia. National Graphene Institute(NGI) University of ManchesterManchester M139PLUK. Department of Materials Science and Engineering National University of SingaporeSingapore 03-09 EASingapore. Institute for Functional Intelligent Materials National University of Singapore117544 SingaporeSingapore

The emergence of van der Waals(vdW)materials resulted in the discovery of their high optical,mechanical,and electronic anisotropic properties,immediately enabling countless novel phenomena and applications.Such success inspired an intensive search for the highest possible anisotropic properties among vdW materials.Furthermore,the identification of the most promising among the huge family of vdW materials is a challenging quest requiring innovative approaches.Here,we suggest an easy-to-use method for such a survey based on the crystallographic geometrical perspective of vdW materials followed by their optical characterization.Using our approach,we found As2S3 as a highly anisotropic vdW material.It demonstrates high in-plane optical anisotropy that is~20%larger than for rutile and over two times as large as calcite,high refractive index,and transparency in the visible range,overcoming the century-long record set by rutile.Given these benefits,As2S3 opens a pathway towards nextgeneration nanophotonics as demonstrated by an ultrathin true zero-order quarter-wave plate that combines classical and the Fabry–Pérot optical phase accumulations.Hence,our approach provides an effective and easy-to-use method to find vdW materials with the utmost anisotropic properties.

关键词： anisotropy anisotropic high

Antenna-assisted picosecond control of nanoscale phase transition in vanadium dioxide

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2016年第1期5卷 415-423页

作者： Otto L Muskens Luca Bergamini Yudong Wang Jeffrey M Gaskell Nerea Zabala CH de Groot David W Sheel Javier Aizpurua Physics and Astronomy Faculty of Physical Sciences and EngineeringUniversity of SouthamptonSouthampton SO171BJUK Department of Electricity and Electronics FCTZTFUPV-EHUBilbao 48080Spain Materials Physics Center CSIC-UPV/EHU and DIPCSan Sebastian 20018Spain Nano Group Faculty of Physical Sciences and EngineeringUniversity of SouthamptonSouthampton SO171BJUK Materials and Physics Research Centre University of SalfordManchester M54WTUK

Nanoscale devices in which the interaction with light can be configured using external control signals hold great interest for next-generation optoelectronic circuits.Materials exhibiting a structural or electronic phase transition offer a large modulation contrast with multi-level optical switching and memory functionalities.In addition,plasmonic nanoantennas can provide an efficient enhancement mechanism for both the optically induced excitation and the readout of materials strategically positioned in their local environment.Here,we demonstrate picosecond all-optical switching of the local phase transition in plasmonic antenna-vanadium dioxide(VO_(2))hybrids,exploiting strong resonant field enhancement and selective optical pumping in plasmonic hotspots.Polarization-and wavelength-dependent pump–probe spectroscopy of multifrequency crossed antenna arrays shows that nanoscale optical switching in plasmonic hotspots does not affect neighboring antennas placed within 100 nm of the excited antennas.The antenna-assisted pumping mechanism is confirmed by numerical model calculations of the resonant,antenna-mediated local heating on a picosecond time scale.The hybrid,nanoscale excitation mechanism results in 20 times reduced switching energies and 5 times faster recovery times than a VO_(2) film without antennas,enabling fully reversible switching at over two million cycles per second and at local switching energies in the picojoule range.The hybrid solution of antennas and VO_(2) provides a conceptual framework to merge the field localization and phase-transition response,enabling precise,nanoscale optical memory functionalities.

关键词： insulator-metal phase transition nanoantenna plasmonics VO_(2)