In article number 1900081, Xiao Lin and Baile Zhang reveal a previously unreported phenomenon of normal Doppler frequency shifts in photonic systems with a negative refractive index. Such a counterintuitive phenomenon is intrinsically connected with the backward Cherenkov cone, and it further intrigues the exploration of potential connection between Doppler effects and other motion‐induced physical phenomena, e.g., transition radiation.

中文翻译：

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多普勒效应：负折射率系统中的正常多普勒频移（Laser Photonics Rev. 13（12）/ 2019）

在文章1900081中，Xiao Lin和Zhang Baile揭示了折射率为负的光子系统中以前未报告的正常多普勒频移现象。这种与直觉相反的现象本质上与后向的Cherenkov锥有关，并且进一步激发了对多普勒效应与其他运动引起的物理现象（例如过渡辐射）之间的潜在联系的探索。