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optical waveguide in curved and welded perovskite nanowires

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Science China(Technological Sciences) 2023年第5期66卷 1471-1479页

作者： ZHANG ZhenYu ZHANG YuPeng HONG BinBin WANG GuoPing College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China

Single-crystalline lead halide perovskite nanowires are emerging as promising one-dimensional blocks for nanoscience and nanotechnology,and extensive studies of nano-lasers and nano-photodetectors have been ***,as perfect confined structures,their optical waveguide performances have not been widely paid attention to up to ***,we report on the such issue on single-crystalline CsPbBr3nanowires and quantify it by near-field optical response *** waveguide is verified as total internal reflection mode at the visible band(532 nm),and its far-field end-facet coupling efficiency of 89.6%and propagation loss as low as 5.9 dB/mm are measured from the nanowire with cross-sectional geometry of~600 nm×300 *** evident bending loss exists in naturally curved nanowires,while it usually emerges in artificial-bended ones due to the wrinkled *** welded nanowire networks show significant advantages in integrated waveguides over the artificial assembled ones,due to the coupled photons at the space-confined end-facet *** surface reasoned by lattice degradation is detrimental to propagation loss,but it provides leaked channels for waveguide coupling on nanowire *** work studies the optical waveguide performance of perovskite nanowires with different geometries and goes a step further for integrated nanophotonics.

关键词： optical waveguide perovskite nanowires SNOM curved nanowire welded networks

Zinc Phthalocyanine Thin Film-Based optical waveguide H_(2)S Gas Sensor

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Photonic Sensors 2022年第1期12卷 74-83页

作者： Kediliya WUMAIER Gulgina MAMTMIN Qingrong MA Asiya MAIMAITI Patima NIZAMIDIN Abliz YIMIT College of Chemical Engineering Xinjiang UniversityUrumqi 830046China College of Chemistry and Environmental Science Kashgar UniversityKashgar 844006China

The detection of hydrogen sulfide(H_(2)S)is essential because of its toxicity and abundance in the ***,there is an urgent requisite to develop a highly sensitive and economical H_(2)S detection ***,a zinc phthalocyanine(ZnPc)thin film-based K+-exchanged optical waveguide(OWG)gas sensor was developed for H_(2)S detection by using spin *** sensor showed excellent H_(2)S sensing performance at room temperature with a wide linear range(0.1 ppm 500 ppm),reproducibility,stability,and a low detection limit of *** developed sensor showed a significant prospect in the development of cost-effective and highly sensitive H_(2)S gas sensors.

关键词： Zinc phthalocyanine thin film optical waveguide H_(2)S detection protonation

Three-primary-color molecular cocrystals showing white-light luminescence,tunable optical waveguide and ultrahigh polarized emission

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Science China Chemistry 2022年第2期65卷 408-417页

作者： Shuzhen Li Yan Hao Shuai Guo Chunjie Ding Yujuan Ma Ruibin Liu Dongpeng Yan Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing 100081China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

Three-primary-color luminescent materials are highly desirable to construct white-light emitting resource,multi-color optical displays,and tunable photonic ***,the efficient strategy to establish the three-primary-color systems with unique photofunctionalities is still rather limited,particularly for molecular ***,we developed a molecular cocrystal route to obtain three-primary-color emissive materials by tuning different donor-acceptor units based on the same chromophore(4,4′-bis(2,5-dimethylstyryl)biphenyl,Bdb).The warm and cold white-light together with multi-color emission in most of visible region can be highly adjusted by rationally tuning different mixture components of three-primary-color cocrystals through an energy transfer ***,the blue/green/red emitters endow Bdb molecular cocrystals novel colortunable photonic properties(such as one-dimensional(1D)/2D optical waveguide,polarized fluorescence,up-conversion luminescence,and amplified spontaneous emission),benefitting from their well-defined micro/nanostructures and high ***,the high luminescence quantum yield(82.49%)and polarized anisotropy(0.723)outperform most of state-ofthe-art molecular crystalline ***,this work supplies an effective way to fabricate new types of three-primarycolor phosphors through luminescent cocrystals,which have promising applications in the fields of full-color displays,whitelight irradiation,low-dimensional optical polarization,and micro/nanophotonics.

关键词： three-primary-color emission molecular crystal white light optical waveguide polarized luminescence

RESEARCH ON WATER QUALITY TESTS BASED ON optical waveguide SURFACE PLASMON RESONANCE TECHNOLOGY

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Journal of Innovative optical Health Sciences 2010年第2期3卷 135-140页

作者： XIUHUA YUAN MING ZHAO YAN’AN ZENG Wuhan National Laboratory for Optoelectronics College of Optoelectronic Science and Engineering Huazhong University of Science and Technology Wuhan 430074P.R.China

The water quality testing principle by surface plasmon resonance(SPR)is *** the scanning mode angular spectral testing and the CCD angular spectral testing,a kind of highresolution,wide-range,and portable optical waveguide SPR angular spectral testing system is studied,the method of improving the testing accuracy is discussed,and a long-life surface plasmon optical waveguide transducer is also *** the SPR testing system,we contrastively tack some test for several sorts of solution,the results presented that significant differences of SPR peaks observed in different sorts of liquid,which indicated the effectiveness of SPR technology used in water quality testing and analysis.

关键词： Surface plasmon resonance optical waveguide angular spectral water quality analysis

Asymmetric nonlinear-mode-conversion in an optical waveguide with PT symmetry

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Frontiers of physics 2022年第5期17卷 183-190页

作者： Changdong Chen Youwen Liu Lina Zhao Xiaopeng Hu Yangyang Fu College of Physics Nanjing University of Aeronautics and AstronauticsNanjing 211100China Key Laboratory of Aerospace Information Materials and Physics(NUAA) MIITNanjing 211106China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China National Laboratory of Solid State Microstructures College of Engineering and Applied Sciencesand School of PhysicsNanjing UniversityNanjing 210093China

Asymmetric mode transformation in waveguide is of great significance for on-chip integrated devices with one-way effect,while it is challenging to achieve asymmetric nonlinear-mode-conversion(NMC)due to the limitations imposed by *** this work,we theoretically proposed a new scheme for realizing asymmetric NMC by combining frequencydoubling process and periodic PT symmetric modulation in an optical *** engineering the one-way momentum from PT symmetric modulation,we have demonstrated the unidirectional conversion from pump to second harmonic with desired guided *** findings offer new opportunities for manipulating nonlinear optical fields with PT symmetry,which could further boost more exploration on on-chip nonlinear devices assisted by non-Hermitian optics.

关键词： nonlinear mode conversion meta-grating PT symmetry optical waveguide

Research progresses of SOI optical waveguide devices and integrated optical switch matrix

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Science in China(Series F) 2005年第2期48卷 234-246页

作者： YUJinzhong CHENShaowu XIAJinsong WANGZhangtao FANZhongchao LIYanping LIUJingwei YANGDi CHENYuanyuan StateKeyLaboratoryonIntegratedOptoelectronics InstituteofSemiconductorsChineseAcademyofSciencesBeijing100083China

SOI (silicon-on-insulator) is a new material with a lot of important perform- ances such as large index difference, low transmission loss. Fabrication processes for SOI based optoelectronic devices are compatible with conventional IC processes. Having the potential of OEIC monolithic integration, SOI based optoelectronic devices have shown many good characteristics and become more and more attractive recently. In this paper, the recent progresses of SOI waveguide devices in our research group are presented. By highly effective numerical simulation, the single mode conditions for SOI rib waveguides with rectangular and trapezoidal cross-section were accurately investigated. Using both chemical anisotropic wet etching and plasma dry etching techniques, SOI single mode rib waveguide, MMI coupler, VOA (variable optical attenuator), 2×2 thermal-optical switch were successfully designed and fabricated. Based on these, 4×4 and 8×8 SOI optical waveguide integrated switch matrixes are demonstrated for the first time.

关键词： SOI (silicon-on-insulator) optical waveguide single mode condition MMI (multi-mode interfer- ence) VOA (variable optical attenuator) integrated optical switch matrix.

Flexible Förster resonance energy transfer-assisted optical waveguide based on elastic mixed molecular crystals

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Aggregate 2023年第6期4卷 95-100页

作者： Takumi Matsuo Koki Ikeda Shotaro Hayashi School of Engineering Science Kochi University of TechnologyKochiJapan

Flexible molecular crystal waveguides based on elastic molecular crystals(EMCs)are essential inﬂexible and compact optical *** increased loss coefﬁ-cientαdue to self-absorption is often a problem in optical waveguides(OWGs)ofﬂuorescent chemical materials waveguiding photons in active ***,the development of anthracene-based elastic mixed molecular crystals(EMMCs)is reported for Förster Resonance Energy Transfer(FRET)-assisted *** yield a FRET crystal system based on elastic molecular crystals,1%–5%accep-tor doping forﬂuorescent molecular crystals of 9,10-dibromoanthracene 1 was successful by selecting the same regioisomer having electron-withdrawing group,9,10-diformylanthracene 2,as a *** addition to conversion to the mixed system,there is a difference in the elastic modulus and hardness in EMC C1 and EMMC C2@***,the elastic behaviour was also shown in a few percent doping of the ***αvalue of this EMMC,composed of 1 including 1%of 2(0.0077 dB/μm),is much lower than that of EMC composed of 1(0.1258 dB/μm)because of reducing self-absorption in the FRET *** efﬁcient andﬂexible OWG was successfully developed by selecting an appropriate acceptor molecule and its low doping rate for mixed crystal *** method is a practical approach in various functional andﬂexible crystal systems.

关键词： anthracene elastic mixed molecular crystals ﬂexible Förster resonance energy transfer optical waveguide

optical waveguide Property of Nd-doped Laser Materials Nd_xY_(1-x)Al_3(BO_3) _4 and Nd∶MgO∶LiNbO_3

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Semiconductor Photonics and Technology 2001年第4期7卷 205-208页

作者： FANYun－zheng MENGMing－qi CollegeofPhysicsandMicroeletronics ShandongUniversityJinan250061CHN ShandongLunengInformation＆CommunicationCo.Lted. Jinan250001CHN

Lanthanide has attracted much attention in the field of optical communications in recent years. Some property analyses on optical waveguide of Nd doped crystal Nd x Y 1-x A1 3(BO 3) 4 and Nd∶MgO∶LiNbO 3 are made in this paper, followed by introduction of the methods of experimentation and theoretical calculation for the planar optical waveguides. The refractive index profiles of the optical waveguides are analyzed. The above work offers useful information for study on new type materials for optical communications.

关键词： Laser material optical waveguide Ion implantation Refractive index Integrated optics

Studies on the optical waveguide Modulator With the Configuration of Unilateral Fin Line

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The Journal of China Universities of Posts and Telecommunications 1994年第1期1卷 7-10页

作者： Chen Shuqiang Ye Peida (Lab. of optical Fiber Communication, Beijing University of Posts and Telecommunications, Beijing 100088, P. R. China)

in this paper, unilateral fin line configuration is considered as a new type of lithium niobate (LiNb03) optical waveguide modulator. Base on the spectral domain method and the spectral do- main immittance approach, the concrete method to caculate the unilateral fin line on the substrate of anisotropic LiNb03 Crystal is put frond. The caculation of the dispersion and characteristic impedance of the fin line on the substrate of Z-cut LiNb03 crystal in 3 centimeters waveband shows that this configuration is practical. If the crystal is made smaller and thiner, a modulator at higher wave band may well be realized.

关键词： Fin line LiNb03 optical waveguide Modulator