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Plasmon-induced hot carrier dynamics and utilization

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Photonics Insights 2023年第4期2卷 1-42页

作者： Jian Luo Qile Wu Lin Zhou Weixi Lu Wenxing Yang Jia Zhu National laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsKey Laboratory of Intelligent Optical Sensing and ManipulationMinistry of EducationNanjing UniversityNanjingChina School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhouChina

Plasmonics has aroused tremendous interest in photophysics,nanophotonics,and metamaterials.The extreme field concentration of plasmonics offers the ultimate spatial and temporal light control,single-particle detection,and optical modulation.Plasmon decay of metal nanostructures into hot carriers extends the application into photocatalysis,photodetectors,photovoltaics,and ultrafast nanooptics.The generated hot electron–hole pairs are transferred into adjacent dielectrics,well known to be more efficient than the hot carrier generation in dielectrics by direct photoexcitations.However,plasmon-induced hot-carrier-based devices are far from practical applications due to the low quantum yield of hot carrier extraction.Emergent challenges include low hot carrier generation efficiency in metals,rapid energy loss of hot carriers,and severe charge recombination at the metal/dielectric interface.In this review,we provide a fundamental insight into the hot carrier generation,transport,injection,and diffusion into dielectrics based on the steady-state and time-resolved spectroscopic studies as well as theoretical calculations.Strategies to enhance hot carrier generation in metals and electron transfer into dielectrics are discussed in detail.Then,applications based on hot carrier transfer are introduced briefly.Finally,we provide our suggestions on future research endeavors.We believe this review will provide a valuable overall physical picture of plasmon-induced hot carrier applications for researchers.

关键词： surface plasmon resonance hot carriers ultrafast dynamics photocatalysis optical modulation

Multifunctional light-field modulation based on hybrid nonlinear metasurfaces

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Chinese Physics B 2023年第10期32卷 73-89页

作者：钱树航王凯杨加兴关超龙华陆培祥 Wuhan National laboratory for Optoelectronics and School of Physics Huazhong University of Science and TechnologyWuhan 430074China School of Electronic and Information Engineering Hubei University of Science and TechnologyXianning 437100China Hubei Key laboratory of optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205China

The generation characteristics of nonlinear optical signals and their multi-dimensional modulation at micro-nano scale have become a prominent research area in nanophotonics,and also the key to developing various novel nonlinear photonics devices.In recent years,the demand for higher nonlinear conversion efficiency and device integration has led to the rapid progress of hybrid nonlinear metasurfaces composed of nanostructures and nonlinear materials.As a joint platform of stable wavefront modulation,nonlinear metasurface and efficient frequency conversion,hybrid nonlinear metasurfaces offer a splendid opportunity for developing the next-generation of multipurpose flat-optics devices.This article provides a comprehensive review of recent advances in hybrid nonlinear metasurfaces for light-field modulation.The advantages of hybrid systems are discussed from the perspectives of multifunctional light-field modulation,valleytronic modulation,and quantum technologies.Finally,the remaining challenges of hybrid metasurfaces are summarized and future developments are also prospected.

关键词： light-field modulation hybrid metasurfaces nonlinear optics two-dimensional materials

Plasmonic tweezers: for nanoscale optical trapping and beyond

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Light(Science & Applications) 2021年第4期10卷 475-515页

作者： Yuquan Zhang Changjun Min Xiujie Dou Xianyou Wang Hendrik Paul Urbach Michael G.Somekh Xiaocong Yuan Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Optics Research Group Delft University of TechnologyLorentzweg 12628G DelftThe Netherlands

optical tweezers and associated manipulation tools in the far field have had a major impact on scientific and engineering research by offering precise manipulation of small objects.More recently,the possibility of performing manipulation with surface plasmons has opened opportunities not feasible with conventional far-field optical methods.The use of surface plasmon techniques enables excitation of hotspots much smaller than the free-space wavelength;with this confinement,the plasmonic field facilitates trapping of various nanostructures and materials with higher precision.The successful manipulation of small particles has fostered numerous and expanding applications.In this paper,we review the principles of and developments in plasmonic tweezers techniques,including both nanostructure-assisted platforms and structureless systems.Construction methods and evaluation criteria of the techniques are presented,aiming to provide a guide for the design and optimization of the systems.The most common novel applications of plasmonic tweezers,namely,sorting and transport,sensing and imaging,and especially those in a biological context,are critically discussed.Finally,we consider the future of the development and new potential applications of this technique and discuss prospects for its impact on science.

关键词： trapping offering optical

Broadband optical Active Waveguides Written by Femtosecond Laser Pulses in Lithium Fluoride

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Chinese Physics Letters 2014年第1期31卷 72-75页

作者： Ismael Chiamenti Francesca Bonfigli Anderson S. L. Gomes Rosa Maria Montereali Larissa N. da Costa Hypolito J. Kalinowski Federal University of Technology- Parang 80230-901 Curitiba Brazil ENEA C. R. Frascati Photonics Micro and Nanostructures Laboratory UTAPRAD-MNF V. E. Fermi 45 00044 Frascati (Rome) Italy Department of Physics Universidade Federai de Pernambuco necife Brazil

Broadband waveguiding through light-emitting strips directly written in a blank lithium fluoride crystal with a femtosecond laser is reported. Light guiding was observed at several optical wavelengths, from blue, 458 nm, to near-infrared, at 155nm. Visible photoluminescence spectra of the optically active F2 and F33 color centers produced by the fs laser writing process were measured. The wavelength-dependent refractive index increase was estimated to be in the order of 10-3-10-4 in the visible and near-infrared spectral intervals, which is consistent with the stable formation of point defects in LiF.

关键词： Fluorine compounds

Crystalline BC_(2)N quantum dots

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Nano Research 2023年第5期16卷 7837-7843页

作者： Pengyu Zhang Chuang Hou Wei Shao Runsheng Liu Zitong Wu Guoan Tai The State Key laboratory of Mechanics and Control of Mechanical Structures and laboratory of Intelligent Nano Materials and Devices of Ministry of Education College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China

Ternary materials composed of boron,carbon,nitrogen have drawn tremendous attention because of their suitable band gap,high carrier mobility,high thermal conductivity.The properties can effectively compensate for the deficiencies of other typical carbon-based and boron-based materials,such as graphene,borophene,hexagonal boron nitride.Although the theoretical progress has advanced the development of ternary materials,it is still a great challenge to synthesize the new nanostructures with good crystallinity and high yield at low dimensional scales.Herein,we report that BC_(2)N quantum dots(QDs)can be successfully prepared by in-situ two-step thermal decomposition of sodium cyanoborohydride in a hydrogen-rich environment.The results show that the as-prepared BC_(2)N QDs have good crystallinity and high yield.The BC_(2)N QDs have an average lateral size of 3.7 nm and an average thickness of 2.83 nm.The experimental results show that the QDs are semiconducting with an optical band gap of 2.15 eV.Furthermore,a fabricated BC_(2)N QDs-based nonvolatile memory shows a low SET operating voltage(0.74 V)and a high ON/OFF ratio(more than 1.74×10^(3))as well as good stability.

关键词： BC_(2)N quantum dots graphene borophene non-volatile memory

Impact of flm thickness in laser‑induced periodic structures on amorphous Si flms

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Frontiers of Optoelectronics 2023年第2期16卷 115-122页

作者： Liye Xu Jiao Geng Liping Shi Weicheng Cui Min Qiu College of optical Science and Engineering Zhejiang UniversityHangzhou 310058China Key laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Key laboratory of Coastal Environment and Resources of Zhejiang Province(KLaCER) School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China Wuhan National laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China

We report self-organized periodic nanostructures on amorphous silicon thin flms by femtosecond laser-induced oxidation.The dependence of structural periodicity on the thickness of silicon flms and the substrate materials is investigated.The results reveal that when silicon flm is 200 nm,the period of self-organized nanostructures is close to the laser wavelength and is insensitive to the substrates.In contrast,when the silicon flm is 50 nm,the period of nanostructures is much shorter than the laser wavelength,and is dependent on the substrates.Furthermore,we demonstrate that,for the thick silicon flms,quasi-cylindrical waves dominate the formation of periodic nanostructures,while for the thin silicon flms,the formation originates from slab waveguide modes.Finite-diference time-domain method-based numerical simulations support the experimental discoveries.

关键词： Laser-induced periodic surface structures(LIPSS) Ultrafast optoelectronics Laser nanofabrication Quasicylindrical waves

Tunable nonlinear refractive index of two-dimensional MoS2, WS2, and MoSe2 nanosheet dispersions [Invited]

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Photonics Research 2015年第2期3卷 51-55页

作者： Gaozhong Wang Saifeng Zhang Xiaoyan Zhang Long Zhang Ya Cheng Daniel Fox Hongzhou Zhang Jonathan N.Coleman Werner J.Blau Jun Wang Key laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences School of Physics and the Centre for Research on Adaptive nanostructures and Nanodevices (CRANN) Trinity College Dublin State Key laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

Liquid-phase-exfoliation technology was utilized to prepare layered MoS2, WS2, and MoSe2 nanosheets in cyclohexylpyrrolidone. The nonlinear optical response of these nanosheets in dispersions was investigated by observing spatial self-phase modulation（SSPM） using a 488 nm continuous wave laser beam. The diffraction ring patterns of SSPM were found to be distorted along the vertical direction right after the laser traversing the nanosheet dispersions. The nonlinear refractive index of the three transition metal dichalcogenides dispersions n2 was measured to be 10-7cm2W-1, and the third-order nonlinear susceptibility χ（3）10-9 esu. The relative change of effective nonlinear refractive index Δn2e∕n（2e） of the MoS2, WS2, and MoSe2 dispersions can be modulated 0.012–0.240, 0.029–0.154, and 0.091–0.304, respectively, by changing the incident intensities. Our experimental results imply novel potential application of two-dimensional transition metal dichalcogenides in nonlinear phase modulation devices.

关键词： Mo show exp Tunable nonlinear refractive index of two-dimensional MoS2 WS2

Perovskite-type lanthanum ferrite based photocatalysts:Preparation,properties,and applications

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Journal of Energy Chemistry 2022年第3期31卷 314-338,I0009页

作者： Muhammad Humayun Habib Ullah Muhammad Usman Aziz Habibi-Yangjeh Asif Ali Tahir Chundong Wang Wei Luo School of optical and Electronic Information Wuhan National Laboratory for OptoelectronicsEngineering Research Center for Functional Ceramics of the Ministry of EducationHuazhong University of Science and TechnologyWuhan 430074HubeiChina Environment and Sustainability Institute University of ExeterPenryn TR109FECornwallUnited Kingdom Center of Research Excellence in Nanotechnology King Fahd University of Petroleum and Minerals(KFUPM)Dhahran 31261Saudi Arabia Department of Chemistry Faculty of ScienceUniversity of Mohaghegh ArdabiliArdabili P.O.Box 179ArdabilIran

Clean energy and a sustainable environment are grand challenges that the world is facing which can be addressed by converting solar energy into transportable and storable fuels(chemical fuel).The main scientific and technological challenges for efficient solar energy conversion,energy storage,and environmental applications are the stability,durability,and performance of low-cost functional materials.Among different nanomaterials,perovskite type LaFeO_(3)has been extensively investigated as a photocatalyst due to its abundance,high stability,compositional and structural fexibility,high electrocatalytic activity,efficient sunlight absorption,and tunable band gap and band edges.Hence,it is urgent to write a comprehensive review to highlight the trend,challenges,and prospects of LaFeO_(3)in the field of photocatalytic solar energy conversion and environment purification.This critical review summarizes the history and basic principles of photocatalysis.Further,it reviews in detail the LaFeO_(3),applications,shortcomings,and activity enhancement strategies including the design of nanostructures,elemental doping,and heterojunctions construction such as Type-I,Type-II,Z-Type,and uncommon heterojunctions.Besides,the optical and electronic properties,charge carriers separation,electron transport phenomenon and alignment of the band gaps in LaFeO_(3)-based heterostructures are comprehensively discussed.

关键词： Perovskite-type LaFeO_(3) Solar fuel Photocatalysis Doping Heterostructures

B-Site Nanoscale-Ordered Structure Enables Ultra-High Tunable Performance

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Research 2023年第1期2022卷 413-426页

作者： Biaolin Peng Qiuping Lu Yi-Chi Wang Jing-Feng Li Qi Zhang Haitao Huang Laijun Liu Chao Li Limei Zheng Zhong Lin Wang ISchool of Advanced Materials and Nanotechnology Xidian UniversityXi'an 710126China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China State Key laboratory of New Ceramics and Fine Processing Department of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Basque Centre for Materials Applications and NanostructuresUPV/EHU Science ParkBarrio Sarriena s/n48940 LeioaSpain kerbasque Basque Foundation for SciencePlaza Euskadi5Bilbao 48009Spain Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong Kong Guangxi Key laboratory of optical and Electronic Materials and Devices Guilin University of TechnologyGuilin 541004China Instrument Analysis Center Xi'an Jiaotong UniversityXi'an 710049China 'School of Physics Shandong UniversityJinan 250100China school of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332-0245USA

Tunable devices constructed by ferroelectric thin flms are often desired to possess a low dielectric loss while maintainging a high dielectric tunability over a broad operating temperature range in applications,for example,resonators,filters,or phase shifters.However,it is dificult to simultaneously achieve these characteristics by traditional strategies,such as doping and strain modifying.Here,we demonstrate that the dielectric tunability of the sol-gel-prepared Pb(Sc_(1/2)Nb_(1/2))_(0.9)(Mg_(1/3)Nb_(2/3))_(0.O3)(PSNMN)thin film can be almost doubled from~47%to~80.0%(at 10kHz)at a low electric field(~530kV/cm),and the dielectric loss can be sharply reduced by more than an order of magnitude,from~0.50 to~0.037(at 1 kHz)when the thin flm was annealed in air at 650℃ for 15h under the help of an atmosphere-compensating-block(ACB)made from the proto-PSNMN gel.Moreover,the PSNMN thin flm annealed with ACB also exhibited an extremely high thermally-stable dielectric tunability in an ultrabroad temperature range(>130 K),which could be attributed to the Maxwell-Wagner(MW)effect generated by the interface between the PSNMN disordered matrix and the B-site nanoscale-ordered structure formed during the long-term annealing process.The reduced dielectric loss is mainly benefited from the reduced concentration of oxygen vacancy and the possibie MW efects,and the enhanced dielectric tunability could be ascribed to the weaker domain-pinning effect by oxygen vacancy.The breakthrough provides a new universal strategy to achieve utrahigh tunable performance in A(B'_(1/2)B"_(1/2))O3 ferroelectric thin films with a B-site nanoscale-ordered structure,meanwhile it paves the way for ultraintergrated tunable thin-flm-devices with great phase shifter performance in practical applications.

关键词： dielectric ferroelectric breakthrough