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Structural, Electronic and Optical Properties of ScxAl1-xN alloys within DFT Calculations
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作者 Asma Said Yasmina Oussaifi Moncef Said 《Journal of Applied Mathematics and Physics》 2024年第2期569-584,共16页
Structural, electronic and optical properties of Sc-based aluminum-nitride alloy have been carried out with first-principles methods using both local density approximation (LDA) and Heyd-Scuseria-Ernzerhof (HSE) hybri... Structural, electronic and optical properties of Sc-based aluminum-nitride alloy have been carried out with first-principles methods using both local density approximation (LDA) and Heyd-Scuseria-Ernzerhof (HSE) hybrid functional. This latter provides a more accurate description of the lattice parameters, enthalpy of formation, electronic and optical properties of our alloy than standard DFT. We found the transition from wurtzite to rocksalt structures at 61% of Sc concentration. By increasing the scandium concentration, the lattice parameters and the band gap decrease. The HSE band gap is in good agreement with available experimental data. The existence of the strong hybridization between Sc 3d and N 2p indicates the transport of electrons from Sc to N atoms. Besides, it is shown that the insertion of the Sc atom leads to the redshift of the optical absorption edge. The optical absorption of Sc<sub>x</sub>Al<sub>1-x</sub>N is found to decrease with increasing Sc concentrations in the low energy range. Because of this, Sc<sub>x</sub>Al<sub>1-x</sub>N have a great potential for applications in photovoltaics and photocatalysis. 展开更多
关键词 DFT Electronic and optical Properties ScAlN hybrid Functional HSE
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The 8×10 GHz Receiver Optical Subassembly Based on Silica Hybrid Integration Technology for Data Center Interconnection 被引量:3
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作者 Chao-Yi Li Jun-Ming An +8 位作者 Jiu-Qi Wang Liang-Liang Wang Jia-Shun Zhang Jian-Guang Li Yuan-Da Wu Yue Wang Xiao-Jie Yin Yong Li Fei Zhong 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第10期39-43,共5页
An 8×10 GHz receiver optical sub-assembly (ROSA) consisting of an 8-channel arrayed waveguide grating (AWG) and an 8-channel PIN photodetector (PD) array is designed and fabricated based on silica hybrid in... An 8×10 GHz receiver optical sub-assembly (ROSA) consisting of an 8-channel arrayed waveguide grating (AWG) and an 8-channel PIN photodetector (PD) array is designed and fabricated based on silica hybrid integration technology. Multimode output waveguides in the silica AWG with 2% refractive index difference are used to obtain fiat-top spectra. The output waveguide facet is polished to 45° bevel to change the light propagation direction into the mesa-type PIN PD, which simplifies the packaging process. The experimentM results show that the single channel I dB bandwidth of AWG ranges from 2.12nm to 3.06nm, the ROSA responsivity ranges from 0.097 A/W to 0.158A/W, and the 3dB bandwidth is up to 11 GHz. It is promising to be applied in the eight-lane WDM transmission system in data center interconnection. 展开更多
关键词 AWG GHz Receiver optical Subassembly Based on Silica hybrid Integration Technology for Data Center Interconnection The 8 PD
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Hybrid Dispersive Optical Solitons in Nonlinear Cubic-Quintic-Septic Schrödinger Equation 被引量:2
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作者 Clovis Taki Djeumen Tchaho Hugues Martial Omanda +2 位作者 Gaston N’tchayi Mbourou Jean Roger Bogning Timoléon Crépin Kofané 《Optics and Photonics Journal》 2021年第2期23-49,共27页
Certain hybrid prototypes of dispersive optical solitons that we are looking for can correspond to new or future behaviors, observable or not, developed or will be developed by optical media that present the cubic-qui... Certain hybrid prototypes of dispersive optical solitons that we are looking for can correspond to new or future behaviors, observable or not, developed or will be developed by optical media that present the cubic-quintic-septic law coupled, with strong dispersions. The equation considered for this purpose is that of non-linear Schrödinger. The solutions are obtained using the Bogning-Djeumen Tchaho-Kofané method extended to the new implicit Bogning’ functions. Some of the obtained solutions show that their existence is due only to the Kerr law nonlinearity presence. Graphical representations plotted have confirmed the hybrid and multi-form character of the obtained dispersive optical solitons. We believe that a good understanding of the hybrid dispersive optical solitons highlighted in the context of this work allows to grasp the physical description of systems whose dynamics are governed by nonlinear Schrödinger equation as studied in this work, allowing thereby a relevant improvement of complex problems encountered in particular in nonliear optaics and in optical fibers. 展开更多
关键词 Nonlinear Schrödinger Equation Bogning-Djeumen Tchaho-Kofané Method hybrid Dispersive optical Solitons Cubic-Quintic-Septic Law Strong Dispersions Nonlinear optics
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An efficient hybrid protection scheme with shared/dedicated backup paths on elastic optical networks 被引量:3
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作者 Nogbou G. Anoh Michel Babri +3 位作者 Ahmed D. Kora Roger M. Faye Boko Aka Claude Lishou 《Digital Communications and Networks》 SCIE 2017年第1期11-18,共8页
Fast recovery and minimum utilization of resources are the two main criteria for determining the protection scheme quality. We address the problem of providing a hybrid protection approach on elastic optical networks ... Fast recovery and minimum utilization of resources are the two main criteria for determining the protection scheme quality. We address the problem of providing a hybrid protection approach on elastic optical networks under contiguity and continuity of available spectrum constraints. Two main hypotheses are used in this paper for backup paths computation. In the first case, it is assumed that backup paths resources are dedicated. In the second case, the assumption is that backup paths resources are available shared resources. The objective of the study is to minimize spectrum utilization to reduce blocking probability on a network. For this purpose, an efficient survivable Hybrid Protection Lightpath (HybPL) algorithm is proposed for providing shared or dedicated backup path protection based on the efficient energy calculation and resource availability. Traditional First-Fit and Best-Fit schemes are employed to search and assign the available spectrum resources. The simulation results show that HybPL presents better performance in terms of blocking probability, compared with the Minimum Resources Utilization Dedicated Protection (MRU-DP) algorithm which offers better performance than the Dedicated Protection (DP) algorithm. 展开更多
关键词 hybrid protectionElastic optical NetworksBackup shared resourcesEfficient energy costMinimum resource utilizationModulation format
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Spatial quantum coherent modulation with perfect hybrid vector vortex beam based on atomic medium
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作者 马燕 杨欣 +6 位作者 常虹 杨鑫琪 曹明涛 张晓斐 高宏 董瑞芳 张首刚 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第2期360-364,共5页
The perfect hybrid vector vortex beam(PHVVB)with helical phase wavefront structure has aroused significant concern in recent years,as its beam waist does not expand with the topological charge(TC).In this work,we inve... The perfect hybrid vector vortex beam(PHVVB)with helical phase wavefront structure has aroused significant concern in recent years,as its beam waist does not expand with the topological charge(TC).In this work,we investigate the spatial quantum coherent modulation effect with PHVVB based on the atomic medium,and we observe the absorption characteristic of the PHVVB with different TCs under variant magnetic fields.We find that the transmission spectrum linewidth of PHVVB can be effectively maintained regardless of the TC.Still,the width of transmission peaks increases slightly as the beam size expands in hot atomic vapor.This distinctive quantum coherence phenomenon,demonstrated by the interaction of an atomic medium with a hybrid vector-structured beam,might be anticipated to open up new opportunities for quantum coherence modulation and accurate magnetic field measurement. 展开更多
关键词 perfect hybrid vector vortex beam topological charge quantum coherence optical manipulation
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A novel optical beam splitter based on photonic crystal with hybrid lattices
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作者 朱清溢 付永启 +1 位作者 胡德清 章志敏 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第6期307-310,共4页
A novel optical beam splitter constructed on the basis of photonic crystal(PC) with hybrid lattices is proposed in this paper.The band gap of square-lattice PC is so designed that the incident light is divided into ... A novel optical beam splitter constructed on the basis of photonic crystal(PC) with hybrid lattices is proposed in this paper.The band gap of square-lattice PC is so designed that the incident light is divided into several branch beams.Triangular-lattice graded-index PCs are combined for focusing each branch.Computational calculations are carried out on the basis of finite-different time-domain algorithm to prove the feasibility of our design.The waveguide is unnecessary in the design.Thus the device has functions of both splitting and focusing beams.Size of the divided beam at site of full-width at half-maximum is of the order of λ/2.The designed splitter has the advantages that it has a small volume and can be integrated by conventional semiconductor manufacturing process 展开更多
关键词 optical beam splitter photonic crystals hybrid lattices finite-different time-domainmethod
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Temperature and strain sensitivities of surface and hybrid acoustic wave Brillouin scattering in optical microfibers
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作者 Yi Liu Yuanqi Gu +5 位作者 Yu Ning Pengfei Chen Yao Yao Yajun You Wenjun He Xiujian Chou 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第9期333-339,共7页
Temperature and strain sensitivities of surface acoustic wave(SAW)and hybrid acoustic wave(HAW)Brillouin scat-tering(BS)in 1μm-1.3μm diameter optical microfibers are simulated.In contrast to stimulated Brillouin sca... Temperature and strain sensitivities of surface acoustic wave(SAW)and hybrid acoustic wave(HAW)Brillouin scat-tering(BS)in 1μm-1.3μm diameter optical microfibers are simulated.In contrast to stimulated Brillouin scattering(SBS)from bulk acoustic wave in standard optical fiber,SAW and HAW BS,due to SAWs and HAWs induced by the coupling of longitudinal and shear waves and propagating along the surface and core of microfiber respectively,facilitate innovative detection in optical microfibers sensing.The highest temperature and strain sensitivities of the hybrid acoustic modes(HAMs)are 1.082 MHz/℃and 0.0289 MHz/με,respectively,which is suitable for microfiber sensing applica-tion of high temperature and strain resolutions.Meanwhile,the temperature and strain sensitivities of the SAMs are less affected by fiber diameter changes,ranging from 0.05 MHz/℃/μm to 0.25 MHz/℃/μm and 1×10^(-4) MHz/με/μm to 5×10^(-4) MHz/με/μm,respectively.It can be found that that SAW BS for temperature and strain sensing would put less stress on manufacturing constraints for optical microfibers.Besides,the simultaneous sensing of temperature and strain can be realized by SAW and HAW BS,with temperature and strain errors as low as 0.30℃-0.34℃and 14.47με-16.25με. 展开更多
关键词 Brllouin scatering surface acoustic waves hybrid acoustic waves optical microfiber sensing
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Transmission Mechanism Based on Burst Filling in Hybrid Optical Burst/Circuit Switching Networks
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作者 黄胜 胡莲花 +1 位作者 刘焕淋 向劲松 《China Communications》 SCIE CSCD 2013年第9期72-79,共8页
Hybrid optical switching networks make full use of the advantages of Optical Circuit Switching(OCS)and Optical Burst Switching(OBS).In parallel hybrid optical switching networks,edge nodes choose a switching mode for ... Hybrid optical switching networks make full use of the advantages of Optical Circuit Switching(OCS)and Optical Burst Switching(OBS).In parallel hybrid optical switching networks,edge nodes choose a switching mode for traffic and no longer change.The inflexible decision making of the traffic transfer mode leads to low resource utilization when the arrival rate of the OCS traffic is lower than the capacity of the light path.In this paper,a new transmission scheme is proposed to improve resource utilization for hybrid optical switching networks.When the traffic arrival rate of the light path is lower than the transmission rate of the light path,the OCS traffic flow is reshaped at the edge nodes to generate a series of voids.Then,several message packets are sent along the light path to inform the core nodes of the voids of the light paths that represent the unused bandwidth resources.To improve the resource utilization,the voids can be filled with data bursts by core nodes.The simulation results show that the new scheme can effectively reduce the burst loss rate and improve the link utilization of the hybrid optical switching network on the premise of a providing service quality guarantee for OCS traffic. 展开更多
关键词 hybrid optical switching transmi- ssion mechanism burst filling resource utili- zation
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A Novel Outage Capacity Objective Function for Optimal Performance Monitoring and Predictive Fault Detection in Hybrid Free-Space Optical and RF Wireless Networks
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作者 Barnet M. Schmidt 《Communications and Network》 2013年第4期305-315,共11页
This study develops an optimal performance monitoring metric for a hybrid free space optical and radio wireless network, the Outage Capacity Objective Function. The objective function—the dependence of hybrid channel... This study develops an optimal performance monitoring metric for a hybrid free space optical and radio wireless network, the Outage Capacity Objective Function. The objective function—the dependence of hybrid channel outage capacity upon the error rate, jointly quantifies the effects of atmospheric optical impairments on the performance of the free space optical segment as well as the effect of RF channel impairments on the radio frequency segment. The objective function is developed from the basic information-theoretic capacity of the optical and radio channels using the gamma-gamma model for optical fading and Ricean statistics for the radio channel fading. A simulation is performed by using the hybrid network. The objective function is shown to provide significantly improved sensitivity to degrading performance trends and supports of proactive link failure prediction and mitigation when compared to current thresholding techniques for signal quality metrics. 展开更多
关键词 FREE-SPACE optical NETWORKS OUTAGE Capacity hybrid NETWORKS Performance Monitoring Fault MANAGEMENT MIMO Wireless NETWORKS Network MANAGEMENT
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Optical transmitter module with hybrid integration of DFB laser diode and proton-exchanged LiNbO_(3)modulator chip
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作者 Xuyang Wang He Jia +2 位作者 Junhui Li Yumei Guo Yu Liu 《Journal of Semiconductors》 EI CAS CSCD 2022年第6期34-39,共6页
In this work,a hybrid integrated optical transmitter module was designed and fabricated.A proton-exchanged Mach–Zehnder lithium niobate(LiNbO_(3))modulator chip was chosen to enhance the output extinction ratio.A fib... In this work,a hybrid integrated optical transmitter module was designed and fabricated.A proton-exchanged Mach–Zehnder lithium niobate(LiNbO_(3))modulator chip was chosen to enhance the output extinction ratio.A fiber was used to adjust the rotation of the polarization direction caused by the optical isolator.The whole optical path structure,including the laser chip,lens,fiber,and modulator chip,was simulated to achieve high optical output efficiency.After a series of process improvements,a module with an output extinction ratio of 34 dB and a bandwidth of 20.5 GHz(from 2 GHz)was obtained.The optical output efficiency of the whole module reached approximately 21%.The link performance of the module was also measured. 展开更多
关键词 optical transmitter module hybrid integration DFB laser chip LiNbO3 modulator chip
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A Single Mode Hybrid Ⅲ-Ⅴ/Silicon On-Chip Laser Based on Flip-Chip Bonding Technology for Optical Interconnection
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作者 王海玲 郑婉华 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第12期77-80,共4页
A single mode hybrid Ⅲ-Ⅴ/silicon on-chip laser based on the flip-chip bonding technology for on-chip optical interconnection is demonstrated. A single mode Fabry-Perot laser structure with micro-structures on an InP... A single mode hybrid Ⅲ-Ⅴ/silicon on-chip laser based on the flip-chip bonding technology for on-chip optical interconnection is demonstrated. A single mode Fabry-Perot laser structure with micro-structures on an InP ridge waveguide is designed and fabricated on an InP/AIGaInAs multiple quantum well epitaxial layer structure wafer by using i-line lithography. Then, a silicon waveguide platform including a laser mounting stage is designed and fabricated on a silicon-on-insulator substrate. The single mode laser is flip-chip bonded on the laser mounting stage. The lasing light is butt-coupling to the silicon waveguide. The laser power output from a silicon waveguide is 1.3roW, and the threshold is 37mA at room temperature and continuous wave operation. 展开更多
关键词 InP is with Chip Silicon On-Chip Laser Based on Flip-Chip Bonding Technology for optical Interconnection A Single Mode hybrid mode for
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SYNTHESIS AND CHARACTERIZATION OF NOVEL SOL-GEL DOPED ORGANIC/INORGANIC HYBRID NONLINEAR OPTICAL MATERIALS
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作者 XI Hongxia LIU Guanxin +1 位作者 WANG Huan LI Zhong 《Chinese Journal of Reactive Polymers》 2003年第1期1-9,共9页
hydroxy-4-nitro azobenzene (NHA) and 4-amino-4-nitro azobenzene (DO3) were prepared respectively from p-nitrophenylamine as a precursor compound. Two kinds of doped organic/inorganic hybrid nonlinear optical (NLO) mat... hydroxy-4-nitro azobenzene (NHA) and 4-amino-4-nitro azobenzene (DO3) were prepared respectively from p-nitrophenylamine as a precursor compound. Two kinds of doped organic/inorganic hybrid nonlinear optical (NLO) materials containing NHA and DO3 were synthesized by Sol-Gel process. The preparation and properties of two NLO materials were studied and characterized by FTIR, 1H-NMR, UV-VIS, SEM, DSC and SHG measurements. The results show that the maximum doping amounts of NHA and DO3 in two doped hybrid NLO materials are 7.2(wt)% and 11.3(wt)% respectively, and the corresponding second-order NLO coefficients (d33 values) are 2.91×10 8esu and 6.14×10 8esu. Two doped NLO materials have relatively good RT stability, after 90 days at RT the d33 values can maintain about 85% of their initial values, but after 10h at 100℃ can only maintain about 50% of their initial values. In this report, the reasons for high-temperature instability of doped materials were discussed, and the possible improvements were also suggested. 展开更多
关键词 Sol-Gel technology DOPING Organic/inorganic hybrid nonlinear optical materials Second-order NLO coefficients
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Electronic and optical properties of lithium niobate under high pressure: A first-principles study 被引量:1
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作者 桑丹丹 王庆林 +2 位作者 韩崇 陈凯 潘跃武 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第7期420-425,共6页
We theoretically study the structural, electronic, and optical properties of lithium niobate under pressure using the plane-wave pseudopotential density functional theory by CASTEP code. It was found that there is a p... We theoretically study the structural, electronic, and optical properties of lithium niobate under pressure using the plane-wave pseudopotential density functional theory by CASTEP code. It was found that there is a phase transition from the R3 c structure to the Pnma structure at a pressure of 18.7 GPa. The Pnma structure was dynamically stable according to the calculation of phonon dispersion. From the charge density distributions, there exist covalent interactions along the Nb–O bond. The hybridization between O 2p and Nb 4d orbital in the Pnma phase increases with increasing pressure, while it is not changed in the R3c phase. With increasing pressure, the average Nb–O bond length decreases and the Nb–O bond population increases, indicating the increased covalent character between Nb and O atoms under high pressure at Pnma phase, which leads to the increased hybridization between O 2p and Nb 4d orbitals. Furthermore, the optical dielectric function, refractive index, extinction coefficient, electron energy, loss and reflectivity are calculated. 展开更多
关键词 PRESSURE electronic structure optical properties hybridIZATION
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Optical study on intermediate-valence compounds Yb_(1-x)Lu_xAl_3
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作者 吕佳林 雒建林 王楠林 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第1期209-214,共6页
We report an optical spectroscopy study on intermediate valence system Ybl-xLuxA13 with x = 0, 0.25, 0.5, 0.75, and 1. The Kondo temperature in the system is known to increase with increasing Lu concentration. Therefo... We report an optical spectroscopy study on intermediate valence system Ybl-xLuxA13 with x = 0, 0.25, 0.5, 0.75, and 1. The Kondo temperature in the system is known to increase with increasing Lu concentration. Therefore, it is expected that the energy scale of the hybridization gap should increase with increasing Lu concentration based on the periodic Anderson model. On the contrary, we find that the spectral structure associated with the hybridization effect shifts monotonically to lower energy. Furthermore, the Lu substitution results in a substantial increase of the free carrier spectral weight and less pronounced plasma frequency reduction upon lowering temperature. We attribute the effect to the disruption of the Kondo lattice periodicity by the random substitution of Yb by Lu. The work highlights the importance of the lattice periodicity of the rare earth element for understanding the Kondo lattice phenomena. 展开更多
关键词 heavy fermions intermediate valence system optical conductivity hybridization effect
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All optical wavelength converter and its application in optical network
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作者 方捻 《Journal of Shanghai University(English Edition)》 CAS 2006年第4期373-374,共2页
All optical network (AON) is a hot topic in recent studies of optical fiber communications. Key techniques in AON include optical switching/routing, optical cross connection (OXC), all optical wavelength conversi... All optical network (AON) is a hot topic in recent studies of optical fiber communications. Key techniques in AON include optical switching/routing, optical cross connection (OXC), all optical wavelength conversion (AOWC), all optical buffering, etc. Opti- cal switching/routing is in fact wavelength switching/ routing. OXC and wavelength conversion (WC) are introduced into cross nodes so that a virtual wavelength path is established. With WC, communication route is formed only if there is unused wavelength in an individual segment link. The rate wavelength usage is thus greatly increased. The blocking rate of network can be reduced by adding WCs, especially for huge capacity multiple nodes ones. Therefore, WC has attracted much attention in basic research of optical communication and is used in some experimental networks.This dissertation studies all optic wavelength conversion and its application, with the contributions in the following five aspects. 展开更多
关键词 all optical wavelength converter (AOWC) semiconductor optical amplifier (SOA) all optical buffer hybrid optoelectronic ring network (HORNET) asymmetric twin-waveguide(ATG) normal mode chaos secure optical communication PolSK modulation.
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Synthesis and Optical Properties of ZnO Nanoparticles in Submicron PS Hollow Reactors
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作者 Xue-feng Huang Fei-fei Ju +1 位作者 Mo-zhen Wang Xue-wu Ge 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2012年第6期719-724,I0004,共7页
ZnO nanoparticles were first encapsulated in submicron PS hollow microspheres through two-step swelling process of core-shell structured PMMA/PS (PMMA: polymethyl methao- rylate) microspheres in acid-alkali solutio... ZnO nanoparticles were first encapsulated in submicron PS hollow microspheres through two-step swelling process of core-shell structured PMMA/PS (PMMA: polymethyl methao- rylate) microspheres in acid-alkali solution, and the ZnO precursors, i.e. the ethanol solu- tions of (CHaCOO)2Zn and LiOH. The transmission electron microscope, X-ray diffraction, and thermogravimetric analysis results show that the feeding order of ethanol solutions of (CH3COO)2Zn and LiOH in the second swelling step has great influence on the loading efficiency and the size of ZnO nanoparticles, but little on their crystal form. The photolumi- nescence and UV-Vis absorption behavior of ZnO/PS microspheres show that the PS shell can effectively avoid the fluorescence quenching effect. 展开更多
关键词 ZnO/PS hybrid material Core-shell polymer SWELLING PS hollow microsphere optical property
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Tunable phonon-atom interaction in a hybrid optomechanical system
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作者 李耀 李闯 +2 位作者 张建东 董莹 胡慧珠 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第4期58-62,共5页
We theoretically analyze a hybrid system consisting of a levitated neutral atom and a nanoparticle coupled to a cavity.The mechanical oscillator and the atom are effectively coupled to each other through the cavity ph... We theoretically analyze a hybrid system consisting of a levitated neutral atom and a nanoparticle coupled to a cavity.The mechanical oscillator and the atom are effectively coupled to each other through the cavity photons as a bus.By adjusting the driving lasers,we can conveniently switch the phonon-atom coupling between Jaynes-Cummings(JC)and anti-JC forms,which can be used to manipulate the motional states of the mechanical oscillator.As an application,we prepare a superposition state of the mechanical oscillator via the effective phonon-atom interaction and investigate the effects of dissipation on the state generation. 展开更多
关键词 OPTOMECHANICS hybrid system optical tweezers Fock state
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Multifunctional light-field modulation based on hybrid nonlinear metasurfaces
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作者 钱树航 王凯 +3 位作者 杨加兴 关超 龙华 陆培祥 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第10期73-89,共17页
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 nove... 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. 展开更多
关键词 light-field modulation hybrid metasurfaces nonlinear optics two-dimensional materials
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基于有限时间观测器的光储系统母线电压互补滑模控制 被引量:1
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作者 皇金锋 杨振宇 《湖南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第2期12-21,共10页
针对光储直流微网混合储能系统易受能源间歇性输入、负载随机性扰动以及功率流向切换等干扰,会造成母线电压波动、系统功率失稳等问题,提出一种基于有限时间观测器的互补滑模控制(FTESO+CSMC)策略.首先,根据混合储能元件的高低频特性,... 针对光储直流微网混合储能系统易受能源间歇性输入、负载随机性扰动以及功率流向切换等干扰,会造成母线电压波动、系统功率失稳等问题,提出一种基于有限时间观测器的互补滑模控制(FTESO+CSMC)策略.首先,根据混合储能元件的高低频特性,对系统差额功率进行电流等效分配.然后,设计有限时间扩张状态观测器,对系统受到的总扰动进行观测,并将扰动观测值作为前馈项输入互补滑模控制器中,对系统扰动进行补偿,保证系统状态在有限时间内达到收敛,提高了系统的快速性和抗扰性,并根据Lyapunov理论证明了控制系统的稳定性.最后,基于MATLAB仿真平台,对多种模拟工况进行仿真,仿真结果表明,相较于传统控制策略,本文所提控制具有更快的响应速度以及更好的抗扰性能. 展开更多
关键词 光储直流微网 混合储能 母线电压 有限时间观测器 互补滑模
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基于BOPPPS混合教学模式探索与实践——以“应用光学”课程为例
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作者 牟达 刘冬梅 《教育教学论坛》 2024年第3期141-144,共4页
在新工科背景下,线上线下混合教学模式倡导“以学生为中心”,非常注重学生创新精神和应用能力的培养,已经成为当前高校教学改革的重中之重。研究适用于线上线下混合式教学的“应用光学”课程教学内容整合和教学目标建立。在此基础上开... 在新工科背景下,线上线下混合教学模式倡导“以学生为中心”,非常注重学生创新精神和应用能力的培养,已经成为当前高校教学改革的重中之重。研究适用于线上线下混合式教学的“应用光学”课程教学内容整合和教学目标建立。在此基础上开展基于BOPPPS教学模式的教学改革与实践,设计了丰富多彩的教学活动,建立了多元化考核方式。经过了几学期教学实践,该实践能够得到大多数学生的认可。从成绩来看,参与混合式的班级也比参与非混合式的班级优秀成绩的占比要高,教学效果显著。 展开更多
关键词 应用光学 线上线下混合 BOPPPS
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