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Unusual photocarrier and coherent phonon dynamics behaviors of layered PdSeunveiled by ultrafast spectroscopy of the edge surface

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： Tiantian Yun Changfu Huo Jinluo Cheng Zhibo Liu Xiaoqing Yan Key laboratory of Weak-Light Nonlinear photonics Ministry of Education School of Physics Nankai University Collaborative Innovation Center of Extreme Optics Shanxi University gpl photonics laboratory Key Laboratory of Luminescence Science and Technology Chinese Academy of Sciences & State Key Laboratory of Luminescence Science and Applications Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences

Layered materials exhibit different electronic and phonon properties along in-plane and out-of-plane directions; existing studies focus on their in-plane behaviors, and the influence of such anisotropies on the dynamics of photocarriers and phonons is unknown. Here, we fabricate layered PdSe2crystals with flat edge surfaces and compare the time-resolved ultrafast spectroscopies on their basal and edge surfaces. Pronounced differences in the transient reflection spectroscopies reveal the inconsistent photocarrier and phonon dynamics behaviors on the two surfaces: the slow hot carrier relaxation process is accelerated and the thermoelasticity-induced longitudinal coherent acoustic phonon oscillation completely vanishes on the edge surface, as compared with the basal surface. Theoretical analysis reveals that the inconsistent hot carrier dynamics originate from the anisotropic properties of low-energy phonons in PdSe2, and the absence of phonon oscillation on the edge surface results from the wavevector-limited sensitivity of acoustic B1umode. Moreover, polarization-dependent spectroscopies indicate the diverse optical anisotropies beyond the in-plane of PdSe2. This work provides a new method to explore unique physical properties and modulate the optical anisotropy of layered materials.

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Interfacial molecular screening of polyimide dielectric towards high-performance organic field-effect transistors

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Chinese Chemical Letters 2024年第2期35卷 268-271页

作者： Yingshuang Zheng Huchao Li Ting Jiang Fei Jiao Jie Li Yong Lei Guofeng Tian Jinshun Bi Yundong Xuan Liqiang Li Deyang Ji Wenping Hu Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic SciencesInstitute of Molecular Aggregation ScienceTianjin UniversityTianjin 300072China gpl photonics laboratory State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Haihe laboratory of Sustainable Chemical Transformations Tianjin 300192China Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic SciencesSchool of ScienceCollaborative Innovation Center of Chemical Science and EngineeringTianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University Fuzhou 350207China Fachgebiet Angewandte Nanophysik Institut für Physik & IMN MacroNanoTechnische Universität IlmenauIlmenau 98693Germany State Key laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Institute of Microelectronics Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100101China

The compatibility of the gate dielectrics with semiconductors is vital for constructing efficient conducting channel for high charge transport.However,it is still a highly challenging mission to clearly clarify the relationship between the dielectric layers and the chemical structure of semiconductors,especially vacuum-deposited small molecules.Here,interfacial molecular screening of polyimide(Kapton)dielectric in organic field-effect transistors(OFETs)is comprehensively studied.It is found that the semiconducting small molecules with alkyl side chains prefer to form a high-quality charge transport layer on polyimide(PI)dielectrics compared with the molecules without alkyl side chains.On this basis,the fabricated transistors could reach the mobility of 1.2 cm^(2) V^(−1)s^(−1) the molecule with alkyl side chains on bare PI dielectric.What is more,the compatible semiconductor and dielectric would further produce a low activation energy(E_(A))of 3.01 meV towards efficient charge transport even at low temperature(e.g.,100 K,0.9 cm^(2) V^(−1)s^(−1)).Our research provides a guiding scheme for the construction of high-performance thin-film field-effect transistors based on PI dielectric layer at room and low temperatures.

关键词： Interfacial molecular screening Polyimide dielectrics Organic semiconductors Interface engineering Thin-film transistors

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Thermal photonics with broken symmetries

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eLight 2022年第1期2卷 317-336页

作者： Tianji Liu Cheng Guo Wei Li Shanhui Fan gpl photonics laboratory State Key Laboratory of Applied OpticsFine Mechanics and PhysicsChangchun Institute of OpticsChinese Academy of SciencesChangchun 130033China Department of Applied Physics Stanford UniversityStanfordCA 94305USA Department of Electrical Engineering Ginzton LaboratoryStanford UniversityStanfordCA 94305USA

Nanophotonic engineering provides an effective platform to manipulate thermal emission on-demand,enabling unprecedented heat management superior to conventional bulk materials.Amongst a plethora of nanophotonic structures,symmetries play an important role in controlling radiative heat transfer in both near-field and far-field.In physics,broken symmetries generally increase the degree of freedom in a system,enriching the understanding of physical mechanisms and bringing many exciting opportunities for novel applications.In this review,we discussed the underlying physics and functionalities of nanophotonic structures with broken geometrical symmetries,engineered mode symmetries,and broken reciprocity for the control of thermal emission.We overview a variety of physical phenomena and interesting applications,and provide the outlook for future development.

关键词： materials field symmetries

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Birefringent response of graphene oxide film structurized via femtosecond laser

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Nano Research 2022年第5期15卷 4490-4499页

作者： Tingting Zou Bo Zhao Wei Xin Feiyue Wang Hongbo Xie Yuhang Li Yuwei Shan Kun Li Yanbing Sun Jianjun Yang The gpl photonics laboratory State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key laboratory of UV-Emitting Materials and Technology Ministry of EducationNortheast Normal UniversityChangchun 130024China Department of Electronic Information and Physics Changzhi UniversityChangzhi 046011China Changchun New Industries Optoelectronics Technology Co. LtdChangchun 130103China

In-plane birefringent materials present an effective modulation of the optical properties and more degrees of freedom for the signal detection in low dimension,and thus remain a hot topic in realizing the integrated,miniature,and flexible devices for multiple applications.Here,the artificial in-plane birefringence properties have been successfully achieved on a graphene oxide film by a novel femtosecond laser lithography method,which provides a high-speed,large-area,and regular subwavelength gratings(~380 nm)fabrication and photoreduction.The obtained sample manifests an evident optical birefringence(~0.18)and anisotropic photoresponse(~1.21)in the visible range,both of which can be significantly modulated by either the structural morphology or the degree of oxide reduction.Based on the analysis of effective-medium theory and measurements of angle-resolved polarized Raman spectroscopy,the artificial in-plane birefringence is originated from various optical responses of the periodic subwavelength structures for the incident light with different polarization states.This technique shows great advantages for the fabrication of integrated in-plane polarization-dependent devices,which is expected to solve the problems in this field,such as the deficient selection of materials,complex design of micro/nanostructure,and inflexible processing technology.

关键词： femtosecond laser lithography reduced graphene oxide subwavelength structures in-plane birefringence anisotropic photoresponse

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一种基于辐射制冷和太阳能制热的温度自适应双层薄膜

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科学通报:英文版 2023年第18期68卷 2054-2062,M0004页

作者：闵心喆王雪旸李金磊徐凝杜汐然曾梦越李炜朱斌朱嘉 National laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China gpl photonics laboratory State Key Laboratory of Luminescence and ApplicationsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

传统的制冷、制热技术能源消耗量巨大,而利用太空和太阳作为天然冷源和热源的辐射制冷和太阳能制热技术由于零能耗、低碳排的特点受到了研究者们的广泛关注,然而,目前被动式制冷/制热器件通常只能实现单一功能、无法满足动态环境条件下... 详细信息

传统的制冷、制热技术能源消耗量巨大,而利用太空和太阳作为天然冷源和热源的辐射制冷和太阳能制热技术由于零能耗、低碳排的特点受到了研究者们的广泛关注,然而,目前被动式制冷/制热器件通常只能实现单一功能、无法满足动态环境条件下多变的制冷/制热需求,本文提出了一种温度自适应的智能控温双层薄膜(STG),以辐射制冷技术和太阳能制热技术为基础,可以随温度响应实现不同环境条件下制冷/制热模式的智能切换,当温度低于其境界温度时,STG膜在太阳光波段从高反射切换为高吸收(反射率由0.962变为0.059),而中红外发射率始终保持在0.95.该光谱特性使得STG膜在夏季直射阳光(辐射峰值>900Wm)下能够实现比环境温度低5°C的亚环境日间辐射冷却,而在冬季则能实现550Wm²的太阳光加热功率。作者同时通过理论模拟验证当STG膜被大规模应用时,这种可智能切换的制冷/制热装置在节能方面展现出了巨大的应用潜力该设计策略能够为零能耗的热响应控温器件提供新的思路,并为实现能源的可持续发展提供新的途径。

关键词： Radiative cooling Solar heating Switchable Al2O3 NPs-composited PNIPAm hydrogel Al2O3 nanoparticles Temperature control

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基于高效光致发光的彩色亚环境辐射制冷器

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Science Bulletin 2022年第18期67卷 1874-1881,M0004页

作者：王雪旸张骞王帅豪靳淳淇朱斌粟裕聪董训益梁洁鲁振达周林李炜祝世宁朱嘉 National laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China gpl photonics Lab State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

日间辐射冷却技术借助材料对太阳光高反射和对中红外大气窗口高发射的光谱特点,提供了一种零耗能的可持续制冷方案.然而,目前辐射冷却器因为实现对太阳光的高反射通常呈现出白色/银色,限制了其实际应用.开发彩色辐射冷却器则至关重要,... 详细信息

日间辐射冷却技术借助材料对太阳光高反射和对中红外大气窗口高发射的光谱特点,提供了一种零耗能的可持续制冷方案.然而,目前辐射冷却器因为实现对太阳光的高反射通常呈现出白色/银色,限制了其实际应用.开发彩色辐射冷却器则至关重要,但由于显示颜色往往导致对太阳光可见光波段的吸收,增加了体系的热负荷,所以实现彩色辐射制冷亚环境冷却一直是个挑战.本文提出了基于高量子发光效率的光致发光彩色辐射冷却器(PCRC),它可以实现全色谱亚环境日间辐射冷却.此外,作者还报道了一种可大规模生产的静电纺丝/喷墨打印方法制备PCRC.PCRC上层的光致发光着色剂实现显色的同时,将因为显色吸收的太阳光在可见光波段转化为发射光,极大地减少了太阳光对体系的加热效应;底层的醋酸纤维素纳米纤维膜能反射其余波段的太阳光并向宇宙辐射热量.这种基于光致发光的彩色辐射制冷器在太阳光直射(辐射峰值>740 W m^(-2))下,其温度比环境温度低2.2~5.4℃,实现了亚环境日间辐射冷却.该设计策略和可放大的图案化制备技术为辐射冷却的多场景应用开辟了一条新道路,并为可持续能源发展提供了一种创新途径.

关键词：喷墨打印辐射冷却光致发光可持续能源辐射制冷器宇宙辐射醋酸纤维素加热效应

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A versatile interferometric technique for probing the thermophysical properties of complex fluids

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Light(Science & Applications) 2022年第5期11卷 979-990页

作者： Gopal Verma Gyanendra Yadav Chaudry Sajed Saraj Longnan Li Nenad Miljkovic Jean Pierre Delville Wei Li gpl photonics Lab State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina School of Physical Sciences University of LiverpoolLiverpool L693BXUK Materials Research laboratory University of IllinoisUrbanaILUSA Department of Mechanical Science and Engineering University of IllinoisUrbanaILUSA Department of Electrical and Computer Engineering University of IllinoisUrbanaILUSA International Institute for Carbon Neutral Energy Research(WPI-I2CNER) Kyushu University744 MotookaNishi-kuFukuoka 819-0395Japan University of Bordeaux CNRSLOMAUMR 5798F-33405 TalenceFrance

Laser-induced thermocapillary deformation of liquid surfaces has emerged as a promising tool to precisely characterize the thermophysical properties of pure fluids.However,challenges arise for nanofluid(NF)and soft biofluid systems where the direct interaction of the laser generates an intriguing interplay between heating,momentum,and scattering forces which can even damage soft biofluids.Here,we report a versatile,pump-probe-based,rapid,and non-contact interferometric technique that resolves interface dynamics of complex fluids with the precision of~1 nm in thick-film and 150 pm in thin-film regimes below the thermal limit without the use of lock-in or modulated beams.We characterize the thermophysical properties of complex NF in three exclusively different types of configurations.First,when the NF is heated from the bottom through an opaque substrate,we demonstrate that our methodology permits the measurement of thermophysical properties(viscosity,surface tension,and diffusivity)of complex NF and biofluids.Second,in a top illumination configuration,we show a precise characterization of NF by quantitively isolating the competing forces,taking advantage of the different time scales of these forces.Third,we show the measurement of NF confined in a metal cavity,in which the transient thermoelastic deformation of the metal surface provides the properties of the NF as well as thermo-mechanical properties of the metal.Our results reveal how the dissipative nature of the heatwave allows us to investigate thick-film dynamics in the thin-film regime,thereby suggesting a general approach for precision measurements of complex NFs,biofluids,and optofluidic devices.

关键词： deformation thermophysical film

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Laser-induced periodic surface structured electrodes with 45% energy saving in electrochemical fuel generation through field localization

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Opto-Electronic Advances 2022年第11期5卷 29-44页

作者： Chaudry Sajed Saraj Subhash C.Singh Gopal Verma Rahul A Rajan Wei Li Chunlei Guo gpl photonics Lab State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of Chinese Academy of Sciences(UCAS) Beijing 100049China The Institute of Optics University of RochesterRochesterNY 14627USA

Electrochemical oxidation/reduction of radicals is a green and environmentally friendly approach to generating fuels.These reactions,however,suffer from sluggish kinetics due to a low local concentration of radicals around the electrocatalyst.A large applied electrode potential can enhance the fuel generation efficiency via enhancing the radical concentration around the electrocatalyst sites,but this comes at the cost of electricity.Here,we report about a~45%saving in energy to achieve an electrochemical hydrogen generation rate of 3×10^(16) molecules cm^(–2)s^(–1)(current density:10 mA/cm^(2))through localized electric field-induced enhancement in the reagent concentration(LEFIRC)at laser-induced periodic surface structured(LIPSS)electrodes.The finite element model is used to simulate the spatial distribution of the electric field to understand the effects of LIPSS geometric parameters in field localization.When the LIPSS patterned electrodes are used as substrates to support Pt/C and RuO_(2) electrocatalysts,the η_(10) overpotentials for HER and OER are decreased by 40.4 and 25%,respectively.Moreover,the capability of the LIPSS-patterned electrodes to operate at significantly reduced energy is also demonstrated in a range of electrolytes,including alkaline,acidic,neutral,and seawater.Importantly,when two LIPSS patterned electrodes were assembled as the anode and cathode into a cell,it requires 330 mVs of lower electric potential with enhanced stability over a similar cell made of pristine electrodes to drive a current density of 10 mA/cm^(2).This work demonstrates a physical and versatile approach of electrode surface patterning to boost electrocatalytic fuel generation performance and can be applied to any metal and semiconductor catalysts for a range of electrochemical reactions.

关键词： electric field localization hotspot formation laser-induced periodic surface structures electrochemical fuel generation overall water splitting

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Reconfigurable metasurface-based 1×2 waveguide switch

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photonics Research 2021年第10期9卷 2104-2115页

作者： AMGED ALQULIAH MOHAMED ELKABBASH JINLUO CHENG GOPAL VERMA CHAUDRY SAJED SARAJ WEI LI CHUNLEI GUO gpl Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of Chinese Academy of Sciences Beijing 100049China The Institute of Optics University of RochesterRochesterNew York 14627USA Current address:The Research laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA

Reconfigurable nanophotonic components are essential elements in realizing complex and highly integrated photonic circuits.Here we report a novel concept for devices with functionality to dynamically control guided light in the near-visible spectral range,which is illustrated by a reconfigurable and non-volatile(1×2)switch using an ultracompact active metasurface.The switch is made of two sets of nanorod arrays of TiO_(2) and antimony trisulfide(Sb_(2)S_(3)),a low-loss phase-change material(PCM),patterned on a silicon nitride waveguide.The metasurface creates an effective multimode interferometer that forms an image of the input mode at the end of the stem waveguide and routes this image toward one of the output ports depending on the phase of PCM nanorods.Remarkably,our metasurface-based 1×2 switch enjoys an ultracompact coupling length of 5.5μm and a record high bandwidth(22.6 THz)compared to other PCM-based switches.Furthermore,our device exhibits low losses in the near-visible region(∼1 dB)and low cross talk(−11.24 dB)over a wide bandwidth(22.6 THz).Our pro-posed device paves the way toward realizing compact and efficient waveguide routers and switches for applications in quantum computing,neuromorphic photonic networking,and biomedical sensing and optogenetics.

关键词： waveguide interferometer surface

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