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国家自然科学基金(61177095)

作品数:12 被引量:14H指数:2
相关作者:刘劲松胡兵汪盛烈吴四清张曼更多>>
相关机构:华中科技大学湖北科技学院湖北工业大学更多>>
发文基金:国家自然科学基金湖北省自然科学基金国家教育部博士点基金更多>>
相关领域:电子电信理学建筑科学机械工程更多>>

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12 条 记 录,以下是 1-10
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Microwave transmission properties of metamaterials with double sets of square holes被引量:8
2012年
The transmission property of microwave through a kind of metamaterial is investigated experimentally.Such metamaterials are fabricated with a structure of double sets of square holes:subwavelength ones,and small ones whose sizes and spacing are smaller at least one order of magnitude than those of the subwavelength holes.The experimental results show that the peak power of the measured transmission spectra is dependent on the structure parameters of the small holes.The physical origin to create this phenomenon is that the designer surface plasmons sustained by the small holes affect on the transmission property of the microwave passing through the subwavelength holes.The results are promising for proposing some techniques for optoelectronic devices in terahertz and microwave regime.
ZOU Si LIU JinSong WANG KeJia
关键词:传输特性表面等离激元光电子器件峰值功率
强太赫兹场下光生载流子量子产生效率与泵浦光强度关系研究
太赫兹场(THz)与半导体互作用一直是近十年来国际研究的重要方向。我们结合半经典量子模型与模特卡罗载流子传输模型计算了碲化镉(CdTe)中THz脉冲对于激光产生光载流子的效率的影响。理论结果和现有实验结果的吻合说明THz...
褚政刘劲松
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The effect of an optical pump on the absorption coefficient of magnesium-doped near-stoichiometric lithium niobate in terahertz range
2013年
The absorption coefficient of magnesium-doped near-stoichiometric lithium niobate crystal is measured by terahertz time-domain spectroscopy in a frequency range of 0.2 THz^0.9 THz at room temperature. The absorption coefficient is modulated by external optical pump fields. Experimental results show that the absorption coefficient of near-SLN:Mg crystal is approximately in a range of 22 cm- 1_35 cm- 1 in a frequency range of 0.2 THz-0.9 THz and tunable up to nearly 15%. Further theoretical analysis reveals that the variation of absorption coefficient is related to the number of light-induced carriers, domain reversal process, and OH- absorption in this crystal.
左志高凌福日马德才吴亮刘劲松姚建铨
关键词:TERAHERTZ
Influence of the amplitude ratio between two terahertz pulses on two-dimensional spectroscopy被引量:1
2014年
The influence of the amplitude ratio between the two THz pulses on two-dimension THz spectroscopy(2DTS)has been studied theoretically via a classical method in which the expressions for the second-order nonlinearity were derived using perturbation approach,and the THz pulses were not treated as a delta function.Three types of nonlinear sources i.e.,anharmonicity,nonlinear damping,and nonlinear coupling,are considered in a single mode system.The simulation results demonstrated that the amplitude ratio had a notable influence on the 2DTSs,and different sources have different influences.This study is promising for guiding future experiments.
Jiangsheng HuJinsong LiuHuquan LiKejia WangZhengang YangShenglie Wang
关键词:振幅比非线性阻尼非线性源
太赫兹随机激光
介绍了一种新的太赫兹辐射源的研究进展及主要技术方案。太赫兹辐射源是太赫兹技术是否转化为现实生产力的关键环节,然而目前仍然缺乏低造价、高功率、和便携式的低温太赫兹光源,从而限制了太赫兹技术在实际中的应用。基于此,我们提出了...
刘勇肖明刘劲松
关键词:太赫兹随机激光
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The dependence on optical energy of terahertz emission from air plasma induced by two-color femtosecond laser-pulses
2013年
The generation of terahertz (THz) emission from air plasma induced by two-color femtosecond laser pulses is studied on the basis of a transient photocurrent model. While the gas is ionized by the two-color femtosecond laser-pulses com- posed of the fundamental and its second harmonic, a non-vanishing directional photoelectron current emerges, radiating a THz electromagnetic pulse. The gas ionization processes at three different laser-pulse energies are simulated, and the corresponding THz waveforms and spectra are plotted. The results demonstrate that, by keeping the laser-pulse width and the relative phase between two pulses invariant when the laser energy is at a moderate value, the emitted THz fields are significantly enhanced with a near-linear dependence on the optical energy.
吴四清刘劲松汪盛烈胡兵
太赫兹波远程探测的最新研究进展被引量:3
2013年
太赫兹波具有许多独特的性质,在很多科学技术领域有着广泛的应用前景。然而,由于水汽对太赫兹波存在强烈的吸收,使得太赫兹波在空气中的传输距离十分有限,限制了太赫兹波的应用,如何实现太赫兹波的远程探测成为太赫兹领域的研究重点。本文介绍了最近出现的THz-REEF和TEA两种远程太赫兹波探测方法,分析了探测过程和探测系统的结构,解释了内在的物理机制,并对其应用进行了展望。
吴四清刘劲松汪盛烈胡兵
关键词:太赫兹波激光脉冲TEA
Nonlinear radiation response of n-doped indium antimonide and indium arsenide in intense terahertz field
2016年
The nonlinear radiation responses of two different n-doped bulk semiconductors: indium antimonide(In Sb) and indium arsenide(In As) in an intense terahertz(THz) field are studied by using the method of ensemble Monte Carlo(EMC)at room temperature. The results show that the radiations of two materials generate about 2-THz periodic regular spectrum distributions under a high field of 100 k V/cm at 1-THz center frequency. The center frequencies are enhanced to about 7 THz in In Sb, and only 5 THz in In As, respectively. The electron valley occupancy and the percentage of new electrons excited by impact ionization are also calculated. We find that the band nonparabolicity and impact ionization promote the generation of nonlinear high frequency radiation, while intervalley scattering has the opposite effect. Moreover, the impact ionization dominates in In Sb, while impact ionization and intervalley scattering work together in In As. These characteristics have potential applications in up-convension of THz wave and THz nonlinear frequency multiplication field.
龚姣丽刘劲松褚政杨振刚王可嘉姚建铨
关键词:NONPARABOLICITY
Influence of optical wavelength on terahertz radiation from laser-induced air plasma
2013年
Using a well-developed transient photocurrent model, we combine theoretical and numerical studies on the production of terahertz(THz) radiation in laser-induced air plasma. Air molecules are excited and then ionized by the laser-pulses mixing the fundamental and second harmonic fields. As a result, a non-vanishing directional photoelectron current emerges, radiating the THz pulse wave. We mainly discuss the influences of optical wavelength on THz radiation in five di?erent cases. Results show that the fundamental-pulse width(50 fs), energy, and relative phase between two pulses are invariant. When the laser wavelength(from 400 nm to 1.25 μm) becomes longer, the emitted THz fields are significantly enhanced, with a linear dependence on the optical wavelength.
吴四清刘劲松汪盛烈曾延安
A direct method to calculate second-order two-dimensional terahertz spectroscopy in frequency-domain based on classical theory
2018年
Feidi XIANGKejia WANGZhengang YANGJinsong LIUShenglie WANG
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