Open AccessIntensive vertical orientation Smith–Purcell radiation from the 2D well-array metasurface
Author(s) -
P Zhang,
L Wang,
Y Zhang,
Aimierding Aimidula,
MingChun Tang
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.003952
Subject(s) - optics , physics , grating , radiation , radiant intensity , intensity (physics) , coupling (piping) , electron , orientation (vector space) , radiation pattern , terahertz radiation , materials science , antenna (radio) , telecommunications , geometry , computer science , mathematics , quantum mechanics , metallurgy
We present an intensive vertical orientation Smith-Purcell radiation with the 2D well-array metasurface. It is shown that the moving electrons can induce three induced surface currents at the well-array metasurface, where a strong coupling among them takes place. The coupling significantly improves the radiated field intensity and shapes the radiation angle-distribution. The theoretical results show that the Smith-Purcell radiation's field intensity is 3 times larger than the one within a conventional grating structure with directional radiation at 90 degree. Therefore, much stronger intensity and more centralized directional radiation will provide a promising way to develop electron beam driven THz sources.