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国家重点基础研究发展计划(2013CB328702)

作品数:10 被引量:19H指数:2
相关作者:张心正夏峰许京军李文华刘建基更多>>
相关机构:南开大学青岛大学天津财经大学更多>>
发文基金:国家重点基础研究发展计划国家自然科学基金高等学校学科创新引智计划更多>>
相关领域:理学机械工程电子电信一般工业技术更多>>

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10 条 记 录,以下是 1-10
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基于量子存储机制实现光学信息卷积操作的研究被引量:2
2017年
提出了一种利用量子存储机制进行相干光学信息处理的技术,在4f成像系统的像面上可以实现信号光和读取光之间的卷积运算。实验证明了通过基于电磁感应透明(EIT)效应的光脉冲存储和读取过程实现光学信息卷积操作的可行性。该研究结果为基于量子存储机制进行相干光学信息处理提供了理论和实验依据。
李志向刘建基范洪鸣张国权
关键词:光信号处理电磁感应透明
激光超衍射加工机理与研究进展被引量:8
2017年
随着纳米科技和微纳电子器件的发展,制造业对微纳加工技术的要求越来越高.激光加工技术是一种绿色先进制造技术,具有巨大的发展潜力,己广泛应用于不同的制造领域.为实现低成本、高效率、大面积尤其是高精度的激光微纳加工制造,研究和发展激光超衍射加工技术具有十分重要的科学意义和应用价值.本文首先阐述了基于非线性效应的远场激光直写超衍射加工技术的原理与国内外发展状况,包括激光烧蚀加工技术、激光诱导改性加工技术和多光子光聚合加工技术等;然后介绍了几种基于倏逝波的近场激光超衍射加工技术,包括扫描近场光刻技术、表面等离子激元光刻技术等新型超衍射激光近场光刻技术的机理与研究进展;最后对激光超衍射加工中存在的问题及未来发展方向进行了讨论.
张心正夏峰许京军
关键词:激光直写
Enhanced Kerr nonlinearity in a left-handed three-level atomic system driven by a bichromatic field
2013年
China) Enhanced Kerr nonlinearity in a left-handed atomic system consisting of three levels driven by a bichromatic field is presented in this paper. Based on bichromatic field coherence, the real parts of the permittivity and permeability can obtain negative values simultaneously in the same detuning frequency region. By adjusting the frequency difference and the Rabi frequencies of the bichromatic field, the multi-band left-handed behavior of the presented atomic metamaterial is exhibited. Meanwhile, the enhanced Kerr nonlinearity can be realized in this multi-band left-handed three-level atomic system. It is shown that the third-order susceptibility possesses focusing or defocusing properties in the same frequency band.
杨晓雨姜永远
关键词:LEFT-HANDEDMULTI-BAND
Electrically tunable generation of vectorial vortex beams with micro-patterned liquid crystal structures被引量:1
2017年
We develop a new method for smooth and continuous space-variant alignment of the liquid crystal medium in micro-patterned structures, which is based on a radial micro-structured pattern of polymeric ribbons exhibiting out-of-plane orientation with respect to the ITO-coated glass plates. Thanks to the broad range of electrical tunability of the optical retardation for the micro-patterned liquid crystal structures, transformation of the fundamental Gaussian beam into different types of specific beams, including generalized cylindrical vector beams, vortex beams, and vectorial vortex beams, is efficiently demonstrated.
冀志超张心正张玉娇王振华Irena Drevensek-OlenikRomano Rupp李威吴强许京军The MOE Key Laboratory of Weak-Light Nonlinear Photonicsand TEDA Institute of Applied Physics and School of PhysicsNankai University
A compact frequency selective stop-band splitter by using Fabry Perot nanocavity in a T-shaped waveguide
2013年
By utilizing a Fabry–Perot (FP) nanocavity adjacent to T-shaped gap waveguide ports, spectrally selective filtering is realized. When the wavelength of incident light corresponds to the resonance wavelength of the FP nanocavity, the surface plasmons are captured inside the nanocavity, and light is highly reflected from this port. The resonance wavelength is determined by using Fabry–Perot resonance condition for the nanocavity. For any desired filtering frequency the dimension of the nanocavity can be tailored. The numerical results are based on the two-dimensional finite difference time domain simulation under a perfectly matched layer absorbing boundary condition. The analytical and simulation results indicate that the proposed structure can be utilized for filtering and splitting applications.
M Afshari Bavil孙秀冬
Mode characteristics of silver-coated inverted-wedge silica microdisks被引量:2
2015年
The characteristics of whispering gallery modes(WGM) in silver-coated inverted-wedge silica microdisks are theoretically investigated by using finite element method. Dielectric TE mode always exists in silver-coated inverted-wedge resonators; dielectric TM mode tends to couple with SPP modes; only pure interior surface plasmonic polariton(SPP) mode but not pure exterior SPP mode is observed in contrast to the metal-coated cylindrical and toroidal resonators. The dependence of quality factor of different kinds of WGMs on the radius of the resonator and the thickness of the coated silver layer are systematically analyzed. We find that the quality factors of the hybrid WGMs associated with SPP mode can reach 104. The maximum light intensity enhancement in ambient for a hybrid mode consisting of a dielectric TM mode and an exterior SPP mode can be obtained when a silver film of thickness ~40 nm is deposited. The silver-coated inverted-wedge silica resonators may be widely applied in sensing and surface enhanced Raman scattering.
BO FangWANG XiaoOuLI YingGAO FengZHANG GuoQuanXU JingJun
关键词:MICROCAVITY
Reconfigurable metasurfaces that enable light polarization control by light被引量:1
2016年
Plasmonic metasurfaces have recently attracted much attention because of their novel characteristics with respect to light polarization and wave front control on deep-subwavelength scales.The development of metasurfaces with reconfigurable optical responses is opening new opportunities in high-capacity communications,real-time holograms and adaptive optics.Such tunable devices have been developed in the mid-infrared spectral range and operated in light intensity modulation schemes.Here we present a novel optically reconfigurable hybrid metasurface that enables polarization tuning at optical frequencies.The functionality of tuning is realized by switching the coupling conditions between the plasmonic modes and the binary isomeric states of an ethyl red switching layer upon light stimulation.We achieved more than 20°nonlinear changes in the transmitted polarization azimuth using just 4 mW of switching light power.Such design schemes and principles could be easily applied to dynamically adjust the functionalities of other metasurfaces.
Meng-Xin RenWei WuWei CaiBiao PiXin-Zheng ZhangJing-Jun Xu
关键词:PHOTOISOMERIZATIONRECONFIGURABLE
Terahertz phonon polariton imaging被引量:3
2013年
In this article, we primarily review the time-resolved imaging of THz phonon polariton, which is generated by femtosecond laser in ferroelectric crystal. We pay more attention to the imaging in thin crystal, which can be used as an integration platform for terahertz-optics or terahertz-electrics. The imaging techniques, which can get quantitatively in-focus time-resolved images, are introduced in more detail. They have made enormous progress in recent years, and are powerful tools for the research of phonon polariton, optics, and THz wave. We also briefly introduce the generation principle and general propagation properties of THz phonon polariton.
Qiang Wu Qing-Quan Chen Bin Zhang Jing-Jun Xu
分子构型对有机半导体分子TPD,DDB和NPB激射性能的影响
2013年
N,N′-二苯基-N,N′-二(3-甲苯基)-1,1′-联苯-4,4′-二胺(TPD)分子已证明能够在掺杂和非掺杂平面波导结构中产生受激发射,然而对于该分子激射特性的机理却很模糊.为了得到其激射特性的微观解释,我们通过实验和量化理论研究TPD分子的吸收、光致发光、受激发射以及与TPD分子结构类似的两个分子:1,4-二(二苯胺基)联苯(DDB)和N,N′-二苯基-N,N′-二(1-萘基)-1,1′-联苯-4,4′-二胺(NPB).我们发现,DDB分子具有与TPD分子相似的自发辐射放大(ASE)特性,然而NPB分子却没有ASE特性,尽管其斯托克斯位移较大,约0.754eV.量子化学计算分析中,我们利用密度泛函理论(DFT)和弗朗克-康登(Franck-Condon)原理研究分子在电子基态和激发态的分子构型以及电子基态的振动能级.理论分析表明,对于TPD和DDB分子,一些苯环中的较强高频拉伸模式(1199~1664cm-1)对PL谱中的第一振动带(0-1跃迁)有显著贡献,该振动带有利于形成激光的四能级系统.而对于NPB分子,相对大的萘基基团取代了TPD和DDB分子外围的甲基与苯环,会产生一些较强的分子低频振动模式(11~689cm-1),这些低频振动模式则会破坏激光四能级系统.研究结果有助于深刻理解有机分子的激射特性,为新型激射材料的设计和应用提供了理论基础.
马琳马琳刘鹏吴朝新赵翔侯洵
关键词:自发辐射放大四能级系统
基于瞬态光克尔效应的超快光学快门技术被引量:2
2016年
系统介绍了几种基于瞬态光克尔效应的超快光学快门技术,包括传统的光克尔双折射快门技术,瞬态光栅快门技术,以及利用瞬态克尔透镜效应的光学快门技术。这些技术都是在泵浦-探测的实验配置基础上,利用门控光对克尔介质折射率的瞬态调制导致的信号光的相位(偏振态)、传播方向或光束发散角等光学特性的改变实现对信号光的超快时间分辨测量。对比讨论了这些超快快门技术的工作原理和实验配置,结果表明瞬态光束偏折快门技术相比其他快门技术具有无偏振配置要求、无相位匹配条件、超宽带光谱响应范围的特点,在光与物质相互作用的超快动力学研究中具有更为广阔的应用前景。
李文华王振华吴玉娥张心正
关键词:光开关
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