Normal Doppler Frequency Shift in Negative Refractive‐Index Systems,Laser & Photonics Reviews

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Normal Doppler Frequency Shift in Negative Refractive‐Index Systems
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2019-11-04 , DOI: 10.1002/lpor.201900081
Xiao Lin ₁ , Baile Zhang _{1,

2}

Affiliation

Besides the well‐known negative refraction, a negative refractive‐index material can exhibit another two hallmark features, which are the inverse Doppler effect and backward Cherenkov radiation. The former is known as the motion‐induced frequency shift that is contrary to the normal Doppler effect, and the latter refers to the Cherenkov radiation whose cone direction is opposite to the source's motion. Here these two features are combined and the Doppler effect inside the backward Cherenkov cone is discussed. It is revealed that the Doppler effect is not always inversed but can be normal in negative refractive‐index systems. A previously un‐reported phenomenon of normal Doppler frequency shift is proposed in a regime inside the backward Cherenkov cone, when the source's velocity is two times faster than the phase velocity of light. A realistic metal–insulator–metal structure, which supports metal plasmons with an effective negative refractive index, is adopted to demonstrate the potential realization of this phenomenon.

中文翻译：

负折射率系统中的正常多普勒频移

除了众所周知的负折射以外，负折射率材料还可以显示另外两个标志性特征，即反多普勒效应和后切伦科夫辐射。前者称为运动引起的频移，与正常的多普勒效应相反，后者是指切伦科夫辐射，其锥方向与源的运动相反。在这里，将这两个特征组合起来，并讨论了向后的Cherenkov锥内部的多普勒效应。结果表明，在负折射率系统中，多普勒效应并不总是相反的，而是正常的。当光源的速度比光的相速度快两倍时，在后切伦科夫锥内部的情况下，提出了以前未报告的正常多普勒频移现象。

更新日期：2019-11-04

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