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国家自然科学基金(60908028)

作品数:11 被引量:13H指数:2
相关作者:刘玉敏俞重远韩利红闫海峰田宏达更多>>
相关机构:北京邮电大学更多>>
发文基金:国家自然科学基金国家高技术研究发展计划中央高校基本科研业务费专项资金更多>>
相关领域:理学电子电信机械工程更多>>

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11 条 记 录,以下是 1-10
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Influence of disorder and deformation on the optical properties of a two-dimensional photonic crystal waveguide被引量:1
2013年
We investigate the effect of disorder and mechanical deformation on a two-dimensional photonic crystal waveguide. The dispersion characteristics and transmittance of the waveguide are studied using the finite element method. Results show that the geometric change of the dielectric material perpendicular to the light propagation direction has a larger influence on the waveguide characteristics than that parallel to the light propagation direction. Mechanical deformation has an obvious influence on the performance of the waveguide. In particular, longitudinal deformed structure exhibits distinct optical characteristics from the ideal one. Studies on this work will provide useful guideline to the fabrication and practical applications based on photonic crystal waveguides.
孙文倩刘玉敏王东林韩利红郭璇俞重远
关键词:DEFORMATIONDISORDERTRANSMITTANCE
The mechanism of producing energy-polarization entangled photon pairs in the cavity-quantum electrodynamics scheme
2012年
We investigate theoretically two photon entanglement processes in a photonic-crystal cavity embedding a quantum dot in tile strong-coupling regime. The model proposed by Johne et al. (Johne R, Gippius N A, Pavlovic G, Solnyshkov D D, Shelykh I A and Malpuech G 2008 Phys. Rev. Lett. 100 240404), and by Robert et al. (Robert J, Gippius N A and Malpuech G 2009 Phys. Rev. B 79 155317) is modified by considering irreversible dissipation and incoherent continuous pumping for the quantum dot, which is necessary to connect the realistic experiment. The dynamics of tile system is analysed by employing the Born Markov master equation, through which the spectra for the system are computed as a fnnction of various parameters. By means of this analysis the photon-reabsorption process in the strong- coupling regime is first observed and analysed from the perspective of radiation spectrum and the optimal parameters for observing energy-entangled photon pairs are identified.
束长干辛霞刘玉敏俞重远姚文杰王东林曹贵
Calculation of valence band structures of InAs/GaAs quantum ring and quantum dot:using numerical Fourier transform method
2010年
This article puts forward a new method in calculating the band structures of low-dimensional semiconductor structures. In this study, the valence band structures of InAs/GaAs quantum ring and lens-shaped quantum dot are calculated with four-band model, in the framework of effective-mass envelope function theory. To determine the Hamiltonian matrix elements, this article develops the numerical Fourier transform method instead of the widely used analytical integral method. The valence band mixing is considered. The hole energy levels change dramatically with the geometrical parameters of the quantum ring and quantum dot. It is demonstrated that numerical Fourier transform method can be adopted in low-dimensional structures with any shape. The results of Fourier transform method are consistent with the ones of analytical integral in literature; and they are helpful for studying and fabricating optoelectronic devices.
JIA Bo-yong,YU Zhong-yuan,LIU Yu-min,TIAN Hong-da Key Laboratory of Information Photonics and Optical Communications,Ministry of Education,Beijing University of Posts and Telecommunications,Beijing 100876,China
Influence of nanomechanical force on the electronic structure of InAs/GaAs quantum dots
2013年
We show nanomechanical force is useful to dynamically control the optical response of self-assembled quantum dots, giving a method to shift electron and heavy hole levels, interval of electron and heavy hole energy levels, and the emission wavelength of quantum dots (QDs). The strain, the electron energy levels, and heavy hole energy levels of InAs/GaAs(001) quantum dots with vertical nanomechanical force are investigated. Both the lattice mismatch and nanomechanical force are considered at the same time. The results show that the hydrostatic and the biaxial strains inside the QDs subjected to nanomechanical force vary with nanomechanical force. That gives the control for tailoring band gaps and optical response. Moreover, due to strain-modified energy, the band edge is also influenced by nanomechanical force. The nanomechanical force is shown to influence the band edge. As is well known, the band offset affects the electronic structure, which shows that the nanomechanical force is proven to be useful to tailor the emission wavelength of QDs. Our research helps to better understand how the nanomechanical force can be used to dynamically control the optics of quantum dots.
宋鑫冯昊刘玉敏俞重远
Band structure and absorption coefficient in GaN/AlGaN quantum wires
2010年
The band structures of rectangular GaN/AlGaN quantum wires are modeled by using a parabolic effective-mass theory. The absorption coefficients are calculated in a contact-density matrix approach based on the band structure. The results obtained indicate that the peak absorption coefficients augment with the increase of the injected carrier density, and the optical gain caused by interband transition is polarization anisotropic. For the photon energy near 1.55 eV, we can obtain relatively large peak gain. The calculations support the previous results published in the recent literature.
姚文杰俞重远刘玉敏
关键词:GAIN
The equilibrium composition in Ge_xSi_1-_x/Si self-assembled alloy quantum dot
2010年
The equilibrium composition in strained quantum dot is the result of both elastic relaxation and chemical mixing effects, which have a direct relationship to the optical and electronic properties of the quantum-dot-based device. Using the method of moving asymptotes and finite element tools, an efficient technique has been developed to compute the composition profile by minimising the Gibbs free energy in self-assembled alloy quantum dot. In this paper, the composition of dome-shaped CexSi1-x/Si quantum dot is optimized, and the contribution of the different energy to equilibrium composition is discussed. The effect of composition on the critical size for shape transition of pyramid-shaped GeSi quantum dot is also studied.
王东林俞重远刘玉敏叶寒芦鹏飞赵龙郭晓涛
长波长QD-VCSELs中的应变补偿理论被引量:3
2010年
从理论角度定量地研究了量子点垂直腔表面发射激光器(QD-VCSELs)中GaNAs应变补偿层对InAs/GaAs量子点阵列生长质量的改善作用,得出了不同补偿浓度和补偿位置对补偿效果影响的规律,得到了确定最佳补偿参数的途径.为长波长(1.2~1.6μm)QD-VCSELs中量子点有源区的制备提供了理论指导.
冯昊俞重远刘玉敏
关键词:量子点垂直腔面发射激光器
Hybrid plasmon waveguides with metamaterial substrate and dielectric substrate:A contrastive study
2014年
Hybrid plasmon waveguides, respectively, with metamaterial substrate and dielectric substrate are investigated and analyzed contrastively with a numerical finite element method. Basic properties, including propagation length Lp, effective mode area Aeff, and energy distribution, are obtained and compared with waveguide geometric parameters at 1.55 gin. For the waveguide with metamaterial substrate, propagation length Lp increases to several tens of microns and effective mode area Aeff is reduced by more than 3 times. Moreover, the near field region is expanded, leading to potential applications in nanophotonics. Therefore, it could be very helpful for improving the integration density in optical chips and developing functional components on a nanometer scale for all optical integrated circuits.
宫慧刘玉敏俞重远吴秀尹昊智
关键词:METAMATERIAL
Impact of GaNAs strain compensation layer on the electronic structure of InAs/GaAs quantum dots
2013年
The strain and electron energy levels of InAs/GaAs(001) quantum dots (QDs) with a GaNAs strain compensation layer (SCL) are investigated. The results show that both the hydrostatic and biaxiai strain inside the QDs with a GaNAs SCL are reduced compared with those with GaAs capping layers. Moreover, most of the compressive strain in the growth surface is compensated by the tensile strain of the GaNAs SCL, which implies that the influence of the strain environment of underlying QDs upon the next-layer QDs' growth surface is weak and suggests that the homogeneity and density of QDs can be improved. Our results are consistent with the published experimental literature. A GaNAs SCL is shown to influence the strain and band edge. As is known, the strain and the band offset affect the electronic structure, which shows that the SCL is proved to be useful to tailor the emission wavelength of QDs. Our research helps to better understand how the strain compensation technology can be applied to the growth of stacked QDs, which are useful in solar cells and laser devices.
宋鑫冯淏刘玉敏俞重远刘建涛
八角光子晶体光纤传输特性与非线性特性研究被引量:9
2010年
基于有限元法对一种全内反射型八角光子晶体光纤的传输特性和非线性特性进行了研究,并改变该光子晶体光纤空气孔结构参数得出了其特性与光波长的曲线关系图.最终得到一种新结构光子晶体光纤,在入射光波长为1.55μm低损耗窗口处具有非常优越的传输特性和较平坦非线性特性.
闫海峰俞重远田宏达刘玉敏韩利红
关键词:光子晶体光纤色散损耗
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