Characterization of Optical Emission Mechanism UtilizingTraveling Electron Beam on a Waveguide
Characterization of Optical Emission Mechanism UtilizingTraveling Electron Beam on a Waveguide
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利用波导上行进电子束的光学发射机制的表征
DOI：
10.1109/jqe.2010.2042032
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Kuwamura,Y.(他2名)
中科院分区：
文献类型：
--
作者：
Fares,H.;Yamada,M.;Kuwamura,Y.(他2名)
对电子束在高折射率波导中的光发射机制进行了定量研究。在约40kV的电子加速电压下，光发射的波长为1.5m。这种光发射被理解为一种切伦科夫辐射。然而，每个电子的动力学是基于量子力学处理来分析的，其中电子被表示为空间扩展波而不是空间局域点粒子。在这个分析模型中，几个关键参数，如系数，包括自发辐射，电子束和光场之间的耦合系数，电子波的相干长度，和电子波的弛豫时间已被引入。这些参数的数值进行了系统的评价，通过比较的光功率，光谱和电子密度的空间分布的实验测量数据的理论分析结果。
The mechanism of optical emission from a high-refractive-index waveguide excited by a traveling electron beam was quantitatively investigated. The wavelength of optical emission was 1.5m at an electron acceleration voltage of approximately 40kV. This optical emission is understood to be a type of Cherenkov radiation. However, the dynamics of each electron were analyzed on the basis of quantum mechanical treatment, where an electron is expressed as a spatially spreading wave not as a spatially localized point particle. In this analytical model, several key parameters have been introduced such as coefficient to include the spontaneous emission, a coupling coefficient between the electron beam and the optical field, the coherent length of the electron wave, and the relaxation time of the electron wave. Numerical values of these parameters were evaluated systematically by comparing the results of theoretical analyses with experimentally measured data of the optical power, the optical spectrum, and the spatial distribution of electron density.