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Giant magneto field effect in up-conversion amplified spontaneous emission via spatially extended states in organic-inorganic hybrid perovskites

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Opto-Electronic Advances 2022年第2期5卷 33-41页

作者： tangyao shen Jiajun Qin Yujie Bai Jia Zhang Lei Shi Xiaoyuan Hou Jian Zi Bin Hu Department of Physics Fudan UniversityShanghai 200433China Department of Physics Chemistry and Biology(IFM)Linköping UniversityLinköping 58183Sweden Department of Materials Science and Engineering University of TennesseeKnoxvilleTennessee 37996USA

Up-conversion lasing actions are normally difficult to realize in light-emitting materials due to small multi-photon absorp-tion cross section and fast dephasing of excited states during multi-photon *** paper reports an easily ac-cessible up-conversion amplified spontaneous emission(ASE)in organic-inorganic hybrid perovskites(MAPbBr3)films by optically exciting broad gap states with sub-bandgap laser *** broad absorption was optimized by adjust-ing the grain sizes in the MAPbBr3 *** low sub-bandgap pumping intensities,directly exciting the gap states leads to 2-photon,3-photon,and 4-photon up-conversion spontaneous emission,revealing a large optical cross section of multi-photon excitation occurring in such hybrid perovskite *** moderate pumping intensity(1.19 mJ/cm2)of 700 nm laser excitation,a significant spectral narrowing phenomenon was observed with the full width at half maximum(FWHM)de-creasing from 18 nm to 4 nm at the peak wavelength of 550 nm,simultaneously with a nonlinear increase on spectral peak intensity,showing an up-conversion ASE realized at low threshold pumping *** interestingly,the up-con-version ASE demonstrated a giant magnetic field effect,leading to a magneto-ASE reaching 120%.In contrast,the up-conversion photoluminescence(PL)showed a negligible magnetic field effect(<1%).This observation provides an evid-ence to indicate that the light-emitting states responsible for up-conversion ASE are essentially formed as spatially exten-ded *** angular dependent spectrum results further verify the existence of spatially extended states which are polarized to develop coherent in-phase ***,using broad gap states with spatially extended light-emitting states presents a new approach to develop up-conversion ASE in organic-inorganic hybrid perovskites.

关键词： organic-inorganic hybrid perovskite orbital order magneto-ASE spatially extended states

Full description of dipole orientation in organic light-emitting diodes

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Chinese Optics Letters 2023年第2期21卷 92-98页

作者：范灵杰赵茂雄楚娇沈唐尧郑敏嘉关放殷海玮石磊资剑 Department of Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and State Key Laboratory of Surface PhysicsFudan UniversityShanghai 200433China Shanghai Engineering Research Center of Optical Metrology for Nano-fabrication(SERCOM) Shanghai 200433China Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200438China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Considerable progress has been made in organic light-emitting diodes(OLEDs)to achieve high external quantum efficiency,among which dipole orientation has a remarkable *** most cases,the radiation of the dipoles in OLEDs is theoretically predicted with only one orientation parameter to match with corresponding ***,we develop a new theory with three orientation parameters to fully describe the relationship between dipole orientation and power ***,we design an optimal test structure for measuring all three orientation *** three orientation parameters could be retrieved from non-polarized *** theory provides a universal plot of dipole orientations in OLEDs,paving the way for designing more complicated OLED devices.

关键词： organic light-emitting diodes dipole orientation Fourier series expansion

Propagation of light near the band edge in one-dimensional multilayers

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Chinese Physics B 2023年第4期32卷 370-373页

作者：唐洋范灵杰张彦彬李同宇沈唐尧石磊 State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200433China

Optical systems offer rich modulation in light propagation, but sufficient quantitative descriptions lack when highly complex structures are considered since practical structures contain defects or imperfections. Here, we utilize a method combining a data-fitting method and a time-resolved system to describe light propagation near the band edges in onedimensional structures. Calculations after optimization of the method show little deviation to the measurements.

关键词： light propagation band edge light localization

Thin-film neural networks for optical inverse problem

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Light(Advanced Manufacturing) 2021年第4期2卷 23-30页

作者： Lingjie Fan Ang Chen Tongyu Li Jiao Chu Yang Tang Jiajun Wang Maoxiong Zhao tangyao shen Minjia Zheng Fang Guan Haiwei Yin Lei Shi Jian Zi State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200433China Shanghai Engineering Research Center of Optical Metrology for Nano-fabrication(SERCOM) Shanghai 200433China Institute for Nanoelectronic devices and Quantum computing Fudan UniversityShanghai 200438China Collaborative Innovation Center of Advanced Microsstructures Nanjing UniversityNanjing 210093China

The thin-film optical inverse problem has attracted a great deal of attention in science and industry,and is widely applied to optical ***,as the number of layers increases,the time it takes to extract the parameters of thin films drastically ***,we introduce the idea of exploiting the structural similarity of all-optical neural networks and applied it to the optical inverse *** propose thin-film neural networks(TFNNs)to efficiently adjust all the parameters of multilayer thin *** test the performance of TFNNs,we implemented a TFNN algorithm,and a reflectometer at normal incidence was *** on multilayer thin films with 232 layers,it is shown that TFNNs can reduce the time consumed by parameter extraction,which barely increased with the number of layers compared with the conventional *** were also used to design multilayer thin films to mimic the optical response of three types of cone cells in the human *** light passing through these multilayer thin films was then recorded as a colored photo.

关键词： method inverse film

通用型武装直升机调整试飞的主要流程和方法设置

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直升机技术 2012年第2期 27-31页

作者：占瑾信沈庆楼杜武文巴唐尧中航工业直升机设计研究所江西景德镇333001 海军驻哈尔滨地区航空军事代表室黑龙江哈尔滨150060

武装直升机的调整试飞工作主要分两部分进行:第一部分为平台(直升机本身)的调整试飞;第二部分为航电、武器火控系统的调整试飞。在这两部分都调整到位后才能达到鉴定技术状态。本文就武装直升机的平台和航电、武器火控系统的调整试飞流... 详细信息

武装直升机的调整试飞工作主要分两部分进行:第一部分为平台(直升机本身)的调整试飞;第二部分为航电、武器火控系统的调整试飞。在这两部分都调整到位后才能达到鉴定技术状态。本文就武装直升机的平台和航电、武器火控系统的调整试飞流程和方法设置做几点阐述,通过交流积累经验,规避风险,减少不必要的飞行时间架次,缩短调整试飞周期,为武装直升机的调整或鉴定试飞提供技术参考。

关键词：武装直升机调整试飞