Electron Energy Loss Spectroscopy of Singular Plasmonic Metasurfaces,Laser & Photonics Reviews

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Electron Energy Loss Spectroscopy of Singular Plasmonic Metasurfaces
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-06-15 , DOI: 10.1002/lpor.202000055
Fan Yang ₁ , Paloma Arroyo Huidobro ₂ , J. B. Pendry ₁

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Singular plasmonic metasurfaces, which feature sharp edges or ultra‐small gaps, are characterized by a continuous excitation spectrum that results in broadband light‐harvesting properties. In this paper, an analytical study of the electron energy loss spectroscopy (EELS) of this kind of metasurfaces is presented. Making use of transformation optics, the response of singular metasurfaces is studied when interacting with a moving electron both in the frequency and time domains. This allows gaining a deeper understanding of the surface plasmon compression at the singularities, which is responsible for the broadband spectra, as well as of the effect of blunt singularities and nonlocality in the metal. Two instances of singular metasurfaces are considered: one with sharp singularities in the form of sharp angle grooves, and one with smooth singularities in the form of two nearly touching surfaces.

中文翻译：

奇异等离振子表面的电子能量损失谱

具有尖锐边缘或超小间隙的奇异等离子超表面的特征在于连续的激发光谱，从而产生宽带的光收集特性。在本文中，对这种亚表面的电子能量损失谱（EELS）进行了分析研究。利用变换光学，研究了奇异的超表面在频域和时域中与移动电子相互作用时的响应。这样可以更深入地了解奇异点处的表面等离子体激元压缩，这是宽带光谱的原因，还包括钝性奇异点和金属中非局部性的影响。考虑了两个奇异的超表面实例：一个具有锐角槽形式的尖锐奇异点，

更新日期：2020-06-15

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