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Growth and Characterization of High-quality LiAlO2 Single Crystal

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Journal of Materials Science & Technology 2008年第2期24卷 145-148页

作者： Taohua HUANG Shengming ZHOU Hao TENG Hui LIN Jun ZOU Jianhua ZHOU Jun WANG Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Graduate School of Chinese Academy of Sciences Beijing 100039 China

γ-LiAlO2 single crystal is a promising substrate for GaN heteroepitaxy. In this paper, we present the growth of large-sized LiAlO2 crystal by modified Czochralski method. The crystal quality was characterized by high-resolution X-ray diffraction and chemical etching. The results show that the as-grown crystal has perfect quality with the full width at half maximum （FWHM） of 17.7-22.6 arcsec and etch pits density of （0.3- 2.2）×10^4 cm^-2 throughout the crystal boule. The bottom of the crystal boule shows the best quality. The optical transmission spectra from UV to IR exhibits that the crystal is transparent from 0.2 to 5.5μm and becomes completely absorbing around 6.7μm wavelength, The optical absorption edge in near UV region is about 191 nm.

关键词： γ-LiAlO2 crystal Czochralski method Chemical etching transmission spectra

Plasmon resonance coupling in strongly coupled gold nanotube arrays with structural defects

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Chinese Physics B 2012年第8期21卷 222-227页

作者：周昕方见树杨迪武廖湘萍 School of Sciences Hunan University of Technology

We theoretically investigate the transmission spectra and the field distributions with different defects in the gold nanotube arrays by using the finite-difference time-domain method. It is found that the optical properties of the nanotube arrays are strongly influenced by different defects. When there are no defects in the central nanotube, the values of peaks located at both sides of the photonic band gap have their maxima. Based on the distributions of electric field component Ex and the total energy distribution of the electric and the magnetic field, we show that mainly a dipole field distribution is exhibited for the plasmon mode at the long-wavelength edge of the band gap but higher order modes of the composite are excited at the short-wavelength edge of the band gap. The plasmon resonant modes can also be controlled by introducing defects.

关键词： structural defect transmission spectra gold nanotube array field distributions

Influence of dopant content on morphology and optical constants of ZnO:Na films by sol-gel method

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Journal of Central South University 2011年第1期18卷 42-47页

作者：吕建国曹春斌宋学萍孙兆奇 School of Physics and Material Science Anhui University Department of Physics and Electronic Engineering Hefei Normal University School of Sciences Anhui Agricultural University

Undoped and Na-doped ZnO films were deposited by sol-gel *** effects of sodium incorporation on structure,surface morphology and optical constants of the films were investigated.X-ray diffraction patterns show the hexagonal wurtzite polycrystalline structure and that the sodium incorporation leads to the change in the structural characteristics of ZnO *** SEM observations show that the surface morphology of the films is affected by the sodium *** transmission spectra show that the average transmittance of the films is above 85% in the visible *** absorption edge initially blue-shifts and then red-shifts with the increase of Na doping *** optical constants of these films were calculated using transmission *** indices of the films in the visible range decrease at first and then increase with increasing Na doping content.

关键词： Na-doped ZnO sol-gel method transmission spectra optical constants

Electron tunneling through double-electric barriers on HgTe/CdTe heterostructure interface

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Chinese Physics B 2022年第11期31卷 487-492页

作者： Liang-Zhong Lin Yi-Yun Ling Dong Zhang Zhen-Hua Wu School of Information Engineering Zhongshan PolytechnicZhongshan 528400China School of Physics and Material Sciences Guangzhou UniversityGuangzhou 510000China SKLSM Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China MEDIT Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China

We investigate theoretically the carrier transport in a two-dimensional topological insulator of(001)HgTe/CdTe quantum-well heterostructure with inverted band,and find distinct switchable features of the transmission spectra in the topological edge states by designing the double-electric modulation *** transmission spectra exhibit the significant Fabry–Pérot resonances for the double-electric transport ***,the transmission properties show rich behaviors when the Fermi energy lies in the different locations in the energy spectrum and the double-electric barrier *** opacity and transparency of the double-modulated barrier regions can be controlled by tuning the modulated potentials,Fermi energy and the length of modulated *** electrical switching behavior can be realized by tuning the voltages applied on the metal *** Fabry–Pérot resonances leads to oscillations in the transmission which can be observed in *** electric modulated-mechanism provides us a realistic way to switch the transmission in edge states which can be constructed in low-power information processing devices.

关键词： HgTe/CdTe quantum well double-electric modulations transmission spectra Fabry-Pérot resonances

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

Electronic Transport Properties of Transition-Metal Terminated Trigonal Graphene Nanoribbons

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Journal of Modern Physics 2016年第11期7卷 1359-1363页

作者： Fanhua Meng Minghua Zhang Wen Liu Physics and Information Engineering Department Jining University Qufu China

With the non-equilibrium Green’s function method and density functional theory, we have studied the electronic properties of trigonal graphene nanoribbons, with Fe terminal and H terminal, coupled to gold electrodes. Rectification behavior can be observed when the electrode-molecule contact distance is larger than 2.2 Å. The electronic transport is greatly improved in case of Fe terminal which is analyzed in terms of transmission spectra and density of states.

关键词： Trigonal Graphene Nanoribbons Electronic Transport Fe Terminal transmission spectra

Dispersiveness and thickness dependence of the photonic band gap of silica colloidal crystals

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Dispersiveness and thickness dependence of the photonic band...

Design of multi-channel mechanically induced long period fiber gratings module

CCAST“光子晶体”研讨会

作者： Y.J.He, H.M.Su, J.W.Diao, Z.C.Wei, S.J.Jiang, H.Z.WangState Key Laboratory of Ultrafast Laser Spectroscopy, Zhongshan University, Guangzhou 510275,ChinaF.Q.Tang Institute of Photographic Chemistry, Chinese Academy of Sciences, Beijing 100101, ChinaP.Dong State Key Laboratory of Heavy Oil, University of Petroleum, Beijing 102200, China

＜正＞Experimental results demonstrate that the band gap of colloidal crystal changes with boththe thickness of the crystal and the dispersiveness of the spheres. As the thickness decreasesfrom 1 mm, a red shift of band gap with a maximum proportional to the standard deviation ofspheres appears. Such maximum red shifts of 17 nm, 24 nm, 35 nm and more than 106 nmcorrespond to standard deviations of 3.2%, 3.6%, 4.5%, and 8.4% respectively Theseresults imply that in a thin cell, the spaces between the spheres are broad and bring about theappearance of rigorous face-centered-cubic single crystal, while in a thick cell, the narrowinner spaces can not compensate for the deviation of the spheres and makes the bonds of theface-centered-cubic crystal not the same. Especially when the colloidal crystal is assembled byspheres with a standard deviation of 8.4% in a thick cell, the novel phenomenon of a quasi-complete photonic band gap can be observed, which can be explained as an amorphous crystalin the continuous network model. The quasi-complete photonic band gap results from thedecrease of the symmetry of the lattice in the amorphous colloidal crystal.

关键词： photonic band gap amorphous crystal colloidal crystal transmission spectra

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Design of multi-channel mechanically induced long period fib...

Glass Coating Removal by Atmospheric Oxygen Plasma

2008 International Conference on Optical Instruments and Technology

作者： Dejun FENG~(1*),Xia GAO~1,Mingshuang LV~1,Mingshun JIANG~2,Qingmei SUI~2 1 School of Information Science and Engineering,Shandong University,Jinan 250100,China 2 School of Control Science and Engineering,Shandong University,Jinan 250061,China

A multi-channel tunable mechanically induced long-period fiber gratings(LPFGs)scheme is presented,which can induce several LPFGs with different resonance wavelengths *** spectra characteristics are simulated to find the influence of these parameters such as grating length,tilt angle and the pressure on the *** simulation results show that the transmission loss peak mainly depends on both the grating length and the pressure,while tilt angle factor dominates the resonant *** infuence of the pressure and tilt angles on the transmission spectra is experimentally *** multi-channel LPFGs module will have great potential applications in the fiber sensing field and flexible filter design region.

关键词： Long-period fiber gratings blazed grating mechanically induced method transmission spectra photoelastic effect

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Glass Coating Removal by Atmospheric Oxygen Plasma