Manipulating Smith-Purcell Emission with Babinet Metasurfaces
Name
PhysRevLett.117.157401.pdf
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582.35 KB
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Author(s)
Wang, Zuojia
Yao, Kan
Chen, Min
Chen, Hongsheng
Liu, Yongmin
Date Issued
October 2016
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Wang, Zuojia et al. “Manipulating Smith-Purcell Emission with Babinet Metasurfaces.” Physical Review Letters 117.15 (2016): n. pag. © 2016 American Physical Society
Version
Final published version
Abstract
Swift electrons moving closely parallel to a periodic grating produce far-field radiation of light, which is known as the Smith-Purcell effect. In this letter, we demonstrate that designer Babinet metasurfaces composed of C-aperture resonators offer a powerful control over the polarization state of the Smith-Purcell emission, which can hardly be achieved via traditional gratings. By coupling the intrinsically nonradiative energy bound at the source current sheet to the out-of-plane electric dipole and in-plane magnetic dipole of the C-aperture resonator, we are able to excite cross-polarized light thanks to the bianisotropic nature of the metasurface. The polarization direction of the emitted light is aligned with the orientation of the C-aperture resonator. Furthermore, the efficiency of the Smith-Purcell emission from Babinet metasurfaces is significantly increased by 84%, in comparison with the case of conventional gratings. These findings not only open up a new way to manipulate the electron-beam-induced emission in the near-field region but also promise compact, tunable, and efficient light sources and particle detectors.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.117.157401
