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Influence of local environment on the intensity of the localized surface plasmon polariton of Ag nanoparticles
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A combined Ag nanoparticle with an insulating or conductive
layer structure has been designed for molecular detection using
surface enhanced Raman scattering microscopy. Optical absorption
studies revealed localized surface plasmon resonance, which shows
regular red shift with increasing environmental dielectric
constant. With the combined structure of surface enhanced Raman
scattering substrates and rhodamine 6G as a test molecule, the
results in this paper show that the absorption has a linear
relationship with the local electromagnetic field for insulating
substrates, and the electrical property of the substrate has a
non-negligible effect on the intensity of the local electromagnetic
field and hence the Raman enhancement. 相似文献
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Frequency-selective surface (FSS) is a two-dimensional periodic structure consisting of a dielectric substrate and the metal units (or apertures) arranged periodically on it. When manufacturing the substrate, its thickness and dielectric constant suffer process tolerances. This may induce the center frequency of the FSS to shift, and consequently influence its characteristics. In this paper, a bandpass FSS structure is designed. The units are the Jerusalem crosses arranged squarely. The mode-matching technique is used for simulation. The influence of the tolerances of the substrate's thickness and dielectric constant on the center frequency is analyzed. Results show that the tolerances of thickness and dielectric constant have different influences on the center frequency of the FSS. It is necessary to ensure the process tolerance of the dielectric constant in the design and manufacturing of the substrate in order to stabilize the center frequency. 相似文献
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Analysis of heating effect on the process of high deposition rate microcrystalline silicon
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A possible heating effect on the process of high deposition rate microcrystalline silicon has been studied.It includes the discharge time-accumulating heating effect,discharge power,inter-electrode distance,and total gas flow rate induced heating effect.It is found that the heating effects mentioned above are in some ways quite similar to and in other ways very different from each other.However,all of them will directly or indirectly cause the increase of the substrate surface temperature during the process of depositing microcrystalline silicon thin films,which will affect the properties of the materials with increasing time.This phenomenon is very serious for the high deposition rate of microcrystalline silicon thin films because of the high input power and the relatively small inter-electrode distance needed.Through analysis of the heating effects occurring in the process of depositing microcrystalline silicon,it is proposed that the discharge power and the heating temperature should be as low as possible,and the total gas flow rate and the inter-electrode distance should be suitable so that device-grade high quality deposition rate microcrystalline silicon thin films can be fabricated. 相似文献
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资本具有逐利性,但现有研究针对中国资本投资回报率现值的估算及其变动趋势的结论并不一致,而且也没能回答中国的资本红利对经济增长的贡献将在何时结束。事实上,从固定资本存量积累路径的特征及其规律入手,利用理论分析和结合生产函数的数理推导都可以证明:可积累的固定资本存量存在条件最大值,并在C-D生产函数和永续存盘法下可以计算出该极值。通过对中国1986—2013年经济数据的实证分析,发现当其他条件不变时,就中国当前生产水平和投资比例下,最大固定资本存量为1119531万亿元,对应的最大产出为94236万亿元(近19万亿美元)。在中国新常态的增长速度下,单纯依赖资本投资的红利效果,积累到该最大资本存量仍可保证中国经济持续增长8—10年的时间。 相似文献
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测量了线偏振飞秒激光脉冲在空气中成丝产生的氮荧光发射的空间分布.通过改变激光的偏振方向研究成丝过程中氮荧光发射的径向角分布,发现N2+荧光发射在垂直于激光偏振方向上更强,而在平行于激光偏振方向上较弱;N2荧光发射在所有方向上具有近乎相同的强度.原子和分子的激发、电离等动力学过程受激光强度的影响.在飞秒激光成丝过程中沿着激光传播方向,强度呈现先增强后减弱的分布,从而影响这些过程的产物的空间分布及其荧光发射的空间分布.沿着激光传播方向,发现N2荧光先于N2+荧光出现且在N2+荧光消失之后消失.激光强度分布和激光偏振方向均会影响氮荧光的空间分布.基于实验分析,在短焦距情况下,系间窜越过程能很好的解释N2(C3Πu+)的形成,这项研究有助于理解飞秒激光成丝过程中氮荧光发射的产生机制. 相似文献