Group velocity matching in terahertz-driven dielectric-lined waveguides for electron acceleration

Group velocity matching in terahertz-driven dielectric-lined waveguides for electron acceleration
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用于电子加速的太赫兹驱动介电衬里波导中的群速度匹配

DOI:
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发表时间:
2017
期刊:
UK, Europe, China Millimeter Waves and THz Technology Workshop
影响因子:
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通讯作者:
S. Jamison
S. Jamison
中科院分区:
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文献类型:
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作者:
A. Healy;G. Burt;S. Jamison

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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。通过一个由不同时间长度的太赫兹脉冲激发的结构的例子,证明了对净加速度的影响。
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. The effect on net acceleration is demonstrated via an example of a structure excited by a THz pulse of different temporal lengths.
DOI: 10.1038/ncomms9486
发表时间: 2015-10-06
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