GROUP VELOCITY MATCHING IN DIELECTRIC-LINEDWAVEGUIDES AND ITS ROLE IN ELECTRON-TERAHERTZ INTERACTION
GROUP VELOCITY MATCHING IN DIELECTRIC-LINEDWAVEGUIDES AND ITS ROLE IN ELECTRON-TERAHERTZ INTERACTION
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电介质波导中的群速度匹配及其在电子-太赫兹相互作用中的作用
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. Jamison
中科院分区：
文献类型：
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作者：
A. Healy;G. Burt;S. Jamison
太赫兹（THz）驱动的介质衬里波导在电子操纵方面有应用，特别是在加速方面，因为介质的使用允许相速度低于光速。然而，将单一频率与正确的速度相匹配并不能最大限度地提高电子-太赫兹相互作用；波导色散通常会导致不匹配的群速度，因此短太赫兹脉冲的脉冲包络线会沿着结构的长度变化。当包络层以不同的速度向电子传播时，这会减小场振幅，从而加速梯度。本文分析了波导色散对太赫兹电子相互作用的影响及其对太赫兹脉冲产生的结构尺寸和选择的影响。通过一个由单周期太赫兹脉冲激发的结构，优化为高场强但短相互作用长度，以及一个专注于高相互作用长度的结构的例子，证明了这种对净加速度的影响。这与多周期、低强度太赫兹脉冲对净加速度的比较相结合。
Terahertz(THz)-driven dielectric-lined waveguides have applications in electron manipulation, particularly acceleration, as the use of dielectric allows for phase velocities below the speed of light. However matching a single frequency to the correct velocity does not maximise electron-THz interaction; waveguide dispersion typically results in an unmatched group velocity and so the pulse envelope of a short THz pulse changes along the length of the structure. This reduces field amplitude and therefore accelerating gradient as the envelope propagates at a different velocity to the electron. Presented here is an analysis of the effect of waveguide dispersion on THz-electron interaction and its influence on structure dimensions and choice of THz pulse generation. This effect on net acceleration is demonstrated via an example of a structure excited by a single-cycle THz pulse, optimised for high field strength but short interaction length, and a structure with a focus on high interaction length. This is combined with a comparison of multi-cycle, lower intensity THz pulses on net acceleration.
影响因子：
16.6
作者：
Nanni EA;Huang WR;Hong KH;Ravi K;Fallahi A;Moriena G;Miller RJ;Kärtner FX
通讯作者：
Kärtner FX