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Optimization Design of Superluminescent Diodes with RWG Structure for High efficiency coupling with SMFs

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Journal of Semiconductors 2006年第4期27卷 683-687页

作者：钟馨黄翊东赵涵张巍彭江得清华大学电子工程系集成光电子学国家重点实验室北京100084

With the aim of achieving high coupling power of RWG SLDs into SMFs,the structure dependences of the output power and the near field pattern are investigated. The thicknesses of the layers between the active region and the ridge waveguide are optimized by taking into account the injected carrier distribution and local material gain in the SLD cross section.

关键词： superluminescent diode coupling efficiency injection efficiency

Synthesis of Star-like Polybutadienes by a Combination of Living Anionic Polymerization and “Click” coupling Method

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Chinese Journal of Polymer Science 2014年第6期32卷 731-742页

作者： Guang-chun Zhang Jun Zheng Feng Liu Zhi-jie Zhang 马丽唐涛 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences

Three-arm and four-arm star-like polybutadienes （PBds） were synthesized via the combination of living anionic polymerization and the click coupling method. Kinetic study showed that the click reaction between the azido group terminated PBd-t-N3 and the alkyne-containing multifunctional linking reagent was fast and highly efficient. All coupling reactions were fully accomplished within 40 min at 50 ℃ in toluene in the presence of the reducing agent Cu（0）, proven by 1H-NMR, FTIR and GPC measurements. For the coupling reactions between the PBd-t-N3 polymer and dialkyne-containing compound, the final conversion of the coupled PBd-PBd polymer was ca. 97.0%. When a PBd-t-N3 polymer was reacted with trialkyne-containing or tetraalkyne-containing compound, the conversion of three-arm or four-arm PBd was around 95.5% or 87.0%, respectively. Several factors influencing the coupling efficiency were studied, including the molecular weight of the initial PBd-t-N3, arm numbers and the molar ratio of the azido group to the alkynyl group. The results indicated that the conversion of the target products would be promoted when the molecular weight of the PBd-t-N3 was low and the molar ratio of the azido to alkynyl groups was close to 1.

关键词： Polybutadiene Living anionic polymerization Click chemistry Kinetic study coupling efficiency Star-like.

Apodized grating coupler using fully-etched nanostructures

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Chinese Physics B 2016年第8期25卷 211-215页

作者：武华李冲李智勇郭霞 Photonic Device Research Laboratory College of Electronic Information and Control Engineering Beijing University of Technology College of Physics and Electronic Information Gan Nan Normal University State Key Laboratory for Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences School of Science Minzu University of China

A two-dimensional apodized grating coupler for interfacing between single-mode fiber and photonic circuit is demonstrated in order to bridge the mode gap between the grating coupler and optical fiber. The grating grooves of the grating couplers are realized by columns of fully etched nanostructures, which are utilized to digitally tailor the effective refractive index of each groove in order to obtain the Gaussian-like output diffractive mode and then enhance the coupling *** with that of the uniform grating coupler, the coupling efficiency of the apodized grating coupler is increased by 4.3% and 5.7%, respectively, for the nanoholes and nanorectangles as refractive index tunes layer.

关键词： grating couplers equivalent refractive index mode matching coupling efficiency

High-sensitivity methane monitoring based on quasi-fundamental mode matched continuous-wave cavity ring-down spectroscopy

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Chinese Physics B 2022年第9期31卷 326-332页

作者： Zhe Li Shuang Yang Zhirong Zhang Hua Xia Tao Pang Bian Wu Pengshuai Sun Huadong Wang Runqing Yu Anhui Provincial Key Laboratory of Photonic Devices and Materials Anhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China Advanced Laser Technology Laboratory of Anhui Province Hefei 230037China

Continuous-wave cavity ring-down spectroscopy(CW-CRDS)is an important technical means to monitor greenhouse gases in atmospheric *** this paper,a CW-CRDS system is built to meet the needs of atmospheric methane *** problem of mode matching is explained from the perspective of transverse mode and longitudinal mode,and the influence of laser injection efficiency on measurement precision is further *** results of cavity ring-down time measurement show that the measurement precision is higher when the laser is coupled with the fundamental *** the experiment,DFB laser is used to calibrate the system with standard methane concentration,and the measurement residual is less than±4×10^(-4)μs^(-1).The methane concentration in the air is monitored in real time for two *** results show the consistency of the concentration changes over the two days,which further demonstrates the reliability of the system for the measurement of trace *** analyzing the influence of mode matching,it not only assists the adjustment of the optical path,but also further improves the sensitivity of the system measurement.

关键词： continuous-wave cavity ring-down spectroscopy(CW-CRDS) cavity modes coupling efficiency mode matching greenhouse gas

Compact and high-efficient wavelength demultiplexing coupler based on high-index dielectric nanoantennas

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Chinese Physics B 2018年第9期27卷 327-332页

作者： Jingfeng Tan Hua Pang Fengkai Meng and Jin Jiang State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBeijing 100871China

Wavelength demultiplexing waveguide couplers have important applications in integrated nanophotonic devices. Two of the most important indicators of the quality of a wavelength demultiplexing coupler are coupling efficiency and splitting ratio. In this study, we utilize two asymmetric high-index dielectric nanoantennas directly positioned on top of a silicon-on insulator waveguide to realize a compact wavelength demultiplexing coupler in a communication band, which is based on the interference of the waveguide modes coupled by the two nanoantennas. We add a Au substrate for further increasing the coupling efficiency. This has constructive and destructive influences on the antenna＇s in-coupling efficiency owing to the Fabry-Perot（FP） resonance in the SiO2 layer. Therefore, we can realize a wavelength demultiplexing coupler with compact size and high coupling efficiency. This coupler has widespread applications in the areas of wavelength filters,on-chip signal processing, and integrated nanophotonic circuits.

关键词： wavelength demultiplexing coupler high-index dielectric nanoantenna coupling efficiency Fabry-Perot(FP) resonance

Radiation Temperature Scaling Law for Gold Hohlraum Heated with Lasers at 0.35 mm Wavelength

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Chinese Physics Letters 2005年第9期22卷 2328-2331页

作者：江少恩孙可煦丁永坤黄天晅崔延莉陈久森 Laser Fusion Research Center China Academy of Physics Engineering PO Box 919-986 Mianyang 621900

We have carried out the hohlraum experiments about radiation temperature scaling on the Shenguang-Ⅱ （SG- Ⅱ） laser facility with eight laser beams of 0.35#m, pulse duration of about 1.0ns and total energy of 2000J. The reradiated x-ray flux through the laser entrance hole was measured using a soft x-ray spectrometer. The measured peak radiation temperature was 170eV for the standard hohlraum and 150 eV for the 1.5-scaled one. We have derived the radiation temperature scaling law, in which the laser hohlraum coupling efficiency is included. With an appropriate coupling efficiency, the coincidences between experimental and scaling hohlraum radiation temperatures are rather good.

关键词： INERTIAL CONFINEMENT FUSION INDIRECT-DRIVE TARGETS X-RAY CONFINEMENT coupling efficiency PHYSICS BASIS ENERGY-LOSS NOVA LASER FACILITY LIGHT IGNITION

Coupled resonator-induced transparency on a three-ring resonator

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Chinese Physics B 2018年第7期27卷 371-375页

作者： Xinquan Jiao Haobo Yu Miao Yu Chenyang Xue Yongfeng Ren Science and Technology on Electronic Test and Measurement Laboratory North University of ChinaTaiyuan 030051China Key Laboratory of Instrumentation Science ＆ Dynamic Measurement（Ministry of Education） North University of ChinaTaiyuan 030051China

The coupled resonator-induced transparency （CRIT） phenomenon, which is analogous to electromagnetically induced transparency in atomic systems, can occur in an original integrated optical resonator system due to the coherent interference of the coupled optical resonators. The system was composed of three ring resonators on silicon, each with the same cavity size, and the optical coupling to the input and output ports was achieved using grating with a power coupling efficiency of 36%. A CRIT resonance whose spectrum shows a narrow transparency peak with a low group velocity was demonstrated. The quality factor of the ring resonator can attain a value up to 6x 104, and the harmonic wavelength can be controlled by adjusting the temperature. The through and drop transmission spectra of the resonator are reconciled well with each other and also consistent well with the theoretical analysis.

关键词： coupled resonator-induced transparency three-ring resonator coupling efficiency transmission spectra quality factor

High efficiency and broad bandwidth grating coupler between nanophotonic waveguide and fibre

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Chinese Physics B 2010年第1期19卷 393-397页

作者：朱宇徐学俊李智勇周亮韩伟华樊中朝俞育德余金中 State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences Engineering Research Center for Semiconductor Integrated Technology Institute of SemiconductorsChinese Academy of Sciences

A high efficiency and broad bandwidth grating coupler between a silicon-on-insulator （SOI） nanophotonic waveguide and fibre is designed and fabricated. coupling efficiencies of 46% and 25% at a wavelength of 1.55um are achieved by simulation and experiment, respectively. An optical 3 dB bandwidth of 45 mn from 1530 nm to 1575 nm is also obtained in experin, ent. Numerical calculation shows that a tolerance to fabrication error of 10 nm in etch depth is achievable. The measurement results indicate that the alignment error of 112 um results in less than 1 dB additional coupling loss.

关键词： grating coupler silicon-on-insulator coupling efficiency bandwidth

In situ Synthesis of Oligonucleotides on Plasma Treated Polypropylene Microporous Membrane

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Chinese Chemical Letters 2005年第3期16卷 397-400页

作者： NongYueHE JianXinTANG SongLI HongCHEN AnCunZHOU LaboratoryofNanotechnology BiomedicineandDevicesZhuzhouInstituteofTechnologyZhuzhou412008 LaboratoryofNanotechnology BiomedicineandDevicesZhuzhouInstituteofTechnologyZhuzhou412008／／Chien-ShiungWuLaboratorySoutheastUniversityNanjing210096 LaboratoryofNanotechnology BiomedicineandDevicesZhuzhouInstituteofTechnologyZhuzhou412008／／LifeScienceandTechnologyDepartmentofCentralSouthForestryUniversityChangsha410004 CollegeofHunanTraditionalChineseMedicine Zhuzhou412000

Polypropylene microporous membranes were treated with plasma in a mixture of N2 and H2 (1:2 in volume). Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FT1R), X-ray photoelectron spectroscopy (XPS) and ultra-violet (UV) spectra demonstrated the success of grafting amino groups. The density of the polar amino groups on the membrane surface is about 0.59 μmol/cm2. The as-treated membranes were successively applied to the in situ synthesis of oligonucleotides and an average coupling yield was more than 98%. The surface feature of the treated membrane is suggested to be responsible for its advantage over a glass slide.

关键词： Plasma grafting. amino group in situ synthesis of oligonucleotides coupling efficiency polypropylene microporous membrane.