Polarization Shaping of Free‐Electron Radiation by Gradient Bianisotropic Metasurfaces,Laser & Photonics Reviews

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Polarization Shaping of Free‐Electron Radiation by Gradient Bianisotropic Metasurfaces
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-02-25 , DOI: 10.1002/lpor.202000426
Liqiao Jing _{1,

2,

3} , Xiao Lin _{1,

3} , Zuojia Wang _{1,

3} , Ido Kaminer ₄ , Hao Hu ₅ , Erping Li ₃ , Yongmin Liu ₆ , Min Chen ₂ , Baile Zhang _{7,

8} , Hongsheng Chen _{1,

3}

Affiliation

Free‐electron radiation phenomena facilitate enticing potential to create light emission with highly tunable spectra, covering hard‐to‐reach frequencies ranging from microwave to X‐ray. Consequently, they take part in many applications such as on‐chip light sources, particle accelerators, and medical imaging. While their spectral tunability is extremely high, their polarizability is usually much harder to control. Such limitations are especially apparent in all free electron based spontaneous radiation sources, such as the Smith−Purcell (SP) radiation. Here, anomalous free‐electron radiation phenomenon is demonstrated at the microwave regime from gradient bianisotropic metasurfaces, by using a phased dipole array to mimics moving charged particles. The phase gradient and the bianisotropy in metasurfaces provide new degrees of freedom for the polarization shaping of free‐electron radiation, going beyond the common spectral and angular shaping. Remarkably, the observed anomalous free‐electron radiation obeys a generalized SP formula derived from Fermat's principle.

中文翻译：

梯度双各向异性亚表面对自由电子辐射的极化整形

自由电子辐射现象促进了诱人的潜力，从而产生了具有高度可调光谱的光发射，涵盖了从微波到X射线等难以到达的频率。因此，它们参与了许多应用，例如片上光源，粒子加速器和医学成像。尽管它们的光谱可调性极高，但其偏振性通常更难控制。这种限制在所有基于自由电子的自发辐射源（例如史密斯-珀塞尔（SP）辐射）中尤为明显。在这里，通过使用相控偶极子阵列模拟运动的带电粒子，在梯度双各向异性超表面上的微波状态下证明了异常的自由电子辐射现象。超表面的相位梯度和各向异性为自由电子辐射的极化成形提供了新的自由度，超越了常见的光谱和角度成形。值得注意的是，观察到的异常自由电子辐射服从于费马原理的广义SP公式。

更新日期：2021-04-11

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