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New insights into plasmonic hot-electron dynamics

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Light(Science & Applications) 2024年第11期13卷 2427-2430页

作者： dangyuan lei Dong Su Stefan A.Maier Department of Materials Science and Engineering Center for Functional Photonicsand Hong Kong Branch of National Precious Metals Material Engineering Research CentreCity University of Hong Kong83 Tat Chee AvenueHong Kong S.A.R.999077China School of Physics and Astronomy Monash UniversityClayton 3800 VICAustralia Blackett Laboratory Imperial College LondonLondon SW72AZUK

Recent advances in understanding the hot-electron dynamics in plasmonic nanostructures have significantly impacted a variety of plasmonically powered physical,chemical,and even biological *** insights into their quant... 详细信息

关键词： dynamics plasmon insight

Transition metal dichalcogenide-based mixed-dimensional heterostructures for visible-light-driven photocatalysis:Dimensionality and interface engineering

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Nano Research 2021年第6期14卷 2003-2022页

作者： Xiaorong Gan dangyuan lei Ruquan Ye Huimin Zhao Kwok-Yin Wong Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education College of EnvironmentHohai UniversityNanjing210098China Department of Materials Science and Engineering City University of Hong KongHong Kong999077China Department of Chemistry State Key Laboratory of Marine PollutionCity University of Hong KongHong Kong999077China Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education China)and School of Environmental Science and TechnologyDalian University of TechnologyDalian116024China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHong Kong999077China

Two-dimensional(2D)transition metal dichalcogenides(TMDCs)are emerging as promising building blocks of high-performance photocatalysts for visible-light-driven water splitting because of their unique physical,chemical,electronic,and optical *** review focuses on the fundamentals of 2D TMDC-based mixed-dimensional heterostructures and their unique properties as visible-light-driven photocatalysts from the perspective of dimensionality and interface ***,we discuss the approaches and advantages of surface modification and functionalization of 2D TMDCs for photocatalytic water splitting under visible-light *** then classify the strategies for improving the photocatalytic activity of 2D TMDCs via combination with various low-dimensional nanomaterials to form mixed-dimensional ***,we highlight recent advances in the use of these mixed-dimensional heterostructures as high-efficiency visible-light-driven photocatalysts,particularly focusing on synthesis routes,modification approaches,and physiochemical mechanisms for improving their ***,we provide our perspectives on future opportunities and challenges in promoting real-world photocatalytic applications of 2D TMDC-based heterostructures.

关键词： two-dimensional semiconductors transition metal dichalcogenides mixed-dimensional heterostructures solar photocatalysis dimensionality and interface engineering

Strain engineering of 2D semiconductors and graphene:from strain fields to band-structure tuning and photonic applications

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Light(Science & Applications) 2020年第1期9卷 130-154页

作者： Zhiwei Peng Xiaolin Chen Yulong Fan David J.Srolovitz dangyuan lei Department of Materials Science and Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong 999077China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomHong Kong 999077China

Two-dimensional(2D)transition metal dichalcogenides(TMDCs)and graphene compose a new family of crystalline materials with atomic thicknesses and exotic mechanical,electronic,and optical *** to their inherent exceptional mechanical flexibility and strength,these 2D materials provide an ideal platform for strain engineering,enabling versatile modulation and significant enhancement of their optical *** instance,recent theoretical and experimental investigations have demonstrated flexible control over their electronic states via application of external strains,such as uniaxial strain and biaxial ***,many nondestructive optical measurement methods,typically including absorption,reflectance,photoluminescence,and Raman spectroscopies,can be readily exploited to quantitatively determine strain-engineered optical *** review begins with an introduction to the macroscopic theory of crystal elasticity and microscopic effective low-energy Hamiltonians coupled with strain fields,and then summarizes recent advances in strain-induced optical responses of 2D TMDCs and graphene,followed by the strain engineering *** concludes with exciting applications associated with strained 2D materials,discussions on existing open questions,and an outlook on this intriguing emerging field.

关键词： strain fields discussions

Phase-change VO_(2)-based thermochromic smart windows

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Light(Science & Applications) 2024年第11期13卷 2489-2510页

作者： Cancheng Jiang Lanyue He Qingdong Xuan Yuan Liao Jian-Guo Dai dangyuan lei Department of Materials Science and Engineering Centre for Functional Photonicsand Hong Kong Branch of National Precious Metals Material Engineering Research CentreCity University of Hong KongKowloonHong Kong 999077China Department of Refrigeration and Cryogenics Engineering Hefei University of Technology193 Tunxi RoadHefei 230009China Department of Architecture and Civil Engineering City University of Hong KongKowloonHong Kong 999077China

Thermochromic coatings hold promise in reducing building energy consumption by dynamically regulating the heat gain of windows,which are often regarded as less energy-efficient components,across different *** dioxide(VO_(2))stands out as a versatile thermochromic material for smart windows owing to its reversible metal-toinsulator transition(MIT)alongside correlated structural and optical *** this review,we delve into recent advancements in the phase-change VO_(2)-based thermochromic coatings for smart windows,spanning from the macroscopic crystal level to the microscopic structural level(including elemental doping and micro/nanoengineering),as well as advances in controllable *** is notable that hybridizing functional elements/materials(e.g.,W,Mo/SiO_(2),TiN)with VO_(2)in delicate structural designs(e.g.,core-shell,optical cavity)brings new degrees of freedom for controlling the thermochromic properties,including the MIT temperature,luminous transmittance,solarenergy modulation ability and building-relevant ***,we provide an overview of alternative chromogenic materials that could potentially complement or surpass the intrinsic limitations of VO_(2).By examining the landscape of emerging materials,we aim to broaden the scope of possibilities for smart window *** also offer insights into the current challenges and prospects of VO_(2)-based thermochromic smart windows,presenting a roadmap for advancing this field towards enhanced energy efficiency and sustainable building *** summary,this review innovatively categorizes doping strategies and corresponding effects of VO_(2),underscores their crucial NIRenergy modulation ability for smart windows,pioneers a theoretical analysis of inverse core-shell structures,prioritizes practical engineering strategies for solar modulation in VO_(2)films,and summarizes complementary chromogenic materials,thus ultimately advancing VO_(2)-based smart windo

关键词： smart doping luminous

Perturbative countersurveillance metaoptics with compound nanosieves

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Light(Science & Applications) 2019年第1期8卷 236-245页

作者： Jiancai Xue Zhang-Kai Zhou Limin Lin Chao Guo Shang Sun dangyuan lei Cheng-Wei Qiu Xue-Hua Wang State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen University510275 GuangzhouChina Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore Department of Materials Science and Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong

The progress of metaoptics relies on identifying photonic materials and geometries,the combination of which represents a promising approach to complex and desired optical *** candidate options are primarily limited by natural ***,the search for meta-atom geometries,by either forward or inverse means,plays a pivotal role in achieving more sophisticated *** efforts mainly focused on building the geometric library of individual meta-atoms and synthesizing various ones into a ***,those efforts neglected the powerfulness of perturbative metaoptics due to the perception that perturbations are usually regarded as adverse and in need of being ***,we report a perturbation-induced countersurveillance strategy using compound nanosieves mediated by structural and thermal *** information can be almost perfectly concealed and camouflaged by the induced thermal-spectral drifts,enabling information storage and exchange in a covert *** perturbative metaoptics can self-indicate whether the hidden information has been attacked during *** results establish a perturbative paradigm of securing a safer world of information and internet of things.

关键词： optics sieve compound

Enhanced efficiency and stability of triple-cation perovskite solar cells with CsPbI_(x)Br_(3−x)QDs“surface patches”

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SmartMat 2022年第3期3卷 513-521页

作者： Guang Yang Hengkai Zhang Siqi Li Zhiwei Ren Guojia Fang dangyuan lei Gang Li Department of Electronic and Information Engineering Research Institute of Smart EnergyThe Hong Kong Polytechnic UniversityHong KongChina Key Laboratory of Artificial Micro‐and Nano‐structures of Ministry of Education of China School of Physics and TechnologyWuhan UniversityWuhanChina Department of Materials Science and Engineering and Centre for Functional PhotonicsCity University of Hong KongHong KongChina Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina

Perovskite solar cells(PSCs)with a light-harvesting three-dimensional perovskite bulk layer as backbone component have achieved great progress in *** recombination is one major place to improve efficiency and stability as they cause significant energy loss in ***,an imperfection in grain boundaries will initiate device *** of the most successful strategies to decrease nonradiative recombination in PSCs is the introduction of reduced dimensional perovskite(e.g.,perovskite quantum wells),benefiting the device's efficiency and stability ***,instead of quantum wells,mixed-cation perovskites with ligand-contained CsPbBr_(x)I_(3−x)quantum dots(QDs)are prepared,which is shown to function as perovskite healing“surface patches.”Benefiting from the“surface patches”effect,the QDs-film shows reduced defects and enhancing film quality which lead to the excellent performance of solar cells(enhancing the power conversion efficiency from 19.21%of the control device to 21.71%[22.1%in reverse scan]).

关键词： perovskite solar cells CsPbI_(x)I_(3−x)QDs healing“surface patches” efficiency and stability enhancement

Plasmon-induced trap filling at grain boundaries in perovskite solar cells

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Light(Science & Applications) 2021年第11期10卷 2233-2244页

作者： Kai Yao Siqi Li Zhiliang Liu Yiran Ying Petr Dvořák Linfeng Fei TomášŠikola Haitao Huang Peter Nordlander Alex K-Y.Jen dangyuan lei Institute of Photovoltaics/Department of Materials Science and Engineering Nanchang UniversityNanchang330031China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Materials Science and Engineering City University of Hong KongKowloonHong KongChina Institute of Physical Engineering Brno University of TechnologyTechnická2Brno61669Czech Republic Laboratory for Nanophotonics Department of Physics and AstronomyDepartment of Electrical and Computer EngineeringRice UniversityHoustonTexas77005USA

The deep-level traps induced by charged defects at the grain boundaries(GBs)of polycrystalline organic-inorganic halide perovskite(OIHP)films serve as major recombination centres,which limit the device ***,we incorporate specially designed poly(3-aminothiophenol)-coated gold(Au@PAT)nanoparticles into the perovskite absorber,in order to examine the influence of plasmonic resonance on carrier dynamics in perovskite solar *** changes in the photophysical properties of the OIHP films reveal that plasmon excitation could fill trap sites at the GB region through photo-brightening,whereas transient absorption spectroscopy and density functional theory calculations correlate this photo-brightening of trap states with plasmon-induced interfacial *** a result,the device achieved the best efficiency of 22.0%with robust operational *** work provides unambiguous evidence for plasmon-induced trap occupation in OIHP and reveals that plasmonic nanostructures may be one type of efficient additives to overcome the recombination losses in perovskite solar cells and thin-film solar cells in general.

关键词： perovskite grain absorber

Polarization-independent highly efficient generation of Airy optical beams with dielectric metasurfaces

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Photonics Research 2020年第7期8卷 1148-1154页

作者： Binbin Yu Jing Wen lei Chen leihong Zhang Yulong Fan Bo Dai Saima Kanwal dangyuan lei Dawei Zhang Engineering Research Center of Optical Instrument and Systems Ministry of Education and Shanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Department of Materials Science and Engineering City University of Hong KongHong KongChina Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China

Airy optical beams have emerged to hold enormous theoretical and experimental research interest due to their outstanding *** approaches suffer from bulky and costly systems,as well as poor phase *** newly developed metasurface-based Airy beam generators have constraints of polarization dependence or limited generation ***,we experimentally demonstrate a polarization-independent silicon dielectric metasurface for generation of high-efficiency Airy optical *** our implementation,rather than synchronous manipulation of the amplitude and phase by plasmonic or Huygens’metasurfaces,we employ and impose a 3/2 phase-only manipulation to the dielectric metasurface,consisting of an array of silicon nanopillars with an optimized transmission efficiency as high as 97%.The resultant Airy optical beams possess extraordinarily large deflection angles and relatively narrow beam *** validated scheme will open up a fascinating doorway to broaden the application scenarios of Airy optical beams on ultracompact photonic platforms.

关键词： dielectric Polarization narrow

A waveguide metasurface based quasi-far-field transverse-electric superlens

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Opto-Electronic Advances 2021年第10期4卷 24-29页

作者： Yechuan Zhu Xiaolin Chen Weizheng Yuan Zhiqin Chu Kwok-yin Wong dangyuan lei Yiting Yu Shaanxi Province Key Laboratory of Micro and Nano Electro-Mechanical Systems Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Micro/Nano Systems for Aerospace(Ministry of Education) Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Province Key Laboratory of Thin Films Technology and Optical Test Xi’an Technological UniversityXi’an 710021China Department of Optical Engineering School of Electronic Science&Applied PhysicsHefei University of TechnologyHefei 230601China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomHong Kong 999077China Department of Electrical and Electronic Engineering Joint Appointment with School of Biomedical SciencesThe University of Hong KongHong Kong 999077China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China

The imaging capability of conventional lenses is mainly limited by the diffraction of light,and the so-called superlens has been developed allowing the recovery of evanescent waves in the focal ***,the remarkable focusing behavi-or of the superlens is greatly confined in the near-field regime due to the exponential decay of evanescent *** tackle this issue,we design a waveguide metasurface-based superlens with an extraordinary quasi-far-field focusing capability beyond the diffraction limit in the present ***,we analyze the underlying physical mechanism and provide experimental verification of the proposed *** metasurface superlens is formed by an array of gradient nanoslits perforated in a gold slab,and supports transverse-electric(TE)waveguide modes under linearly polar-ized illumination along the long axis of the *** results illustrate that exciting such TE waveguide modes can modulate not only optical phase but also evanescent ***,some high-spatial-frequency waves can con-tribute to the focusing of the superlens,leading to the quasi-far-field super-resolution focusing of *** 405 nm illu-mination and oil immersion,the fabricated superlens shows a focus spot of 98 nm(i.e.λ/4.13)at a focal distance of 1.49μm(i.e.3.68λ)using an oil immersion objective,breaking the diffraction limit ofλ/2.38 in the quasi-far field *** developed metasurface optical superlens with such extraordinary capabilities promises exciting avenues to nanolitho-graphy and ultra-small optoelectronic devices.

关键词： superlens metasurface waveguide quasi-far-field super-resolution focusing breaking the diffraction limit