Abstract

We demonstrate that when a charged particle moves on top of a metal-slot metasurface consisting of metallic slot resonators, strong Smith–Purcell electromagnetic (EM) radiation can be produced at resonant frequency. By adjusting the period of the metasurface, the resonant (or working) frequency can be tuned from gigahertz to terahertz and infrared regions. Since the EM field is localized in the slots rather than at the metal surface, the metasurfaces are found to exhibit a very low absorption loss ratio ($<1\%$) in low working frequencies ($<1\mathrm{THz}$). Although it becomes larger in high frequencies ($>1\mathrm{THz}$), the loss ratio remains relatively low ($<12\%$). In addition, a nonlinear relationship is also uncovered between the resonant frequency and the reciprocal of the period. Our results could benefit the construction of efficient, compact terahertz, and infrared free-electron light sources.

© 2018 Optical Society of America

THz Smith–Purcell and grating transition radiation from metasurface: experiment and theory

D. Yu. Sergeeva, A. S. Aryshev, A. A. Tishchenko, K. E. Popov, N. Terunuma, and J. Urakawa
Opt. Lett. 46(3) 544-547 (2021)

Polarized vortex Smith–Purcell radiation with cascaded metasurfaces

Wenxia Xu, Wenjia Li, Yehan Wang, Chunhua Qin, Botian Sun, Chunying Guan, Jianlong Liu, and Jinhui Shi
Opt. Lett. 49(7) 1840-1843 (2024)

Upper bound of efficiency for Smith-Purcell emission and evanescent-to-propagating wave conversion in metal-groove metasurfaces

Ningxiao Jiang, Yanan Song, Jiayuan Du, Xinyu Zhao, Xiaodong Sun, and Xinhua Hu
OSA Continuum 3(6) 1608-1615 (2020)

Generation of Airy beams in Smith–Purcell radiation

Liqiao Jing, Dashuang Liao, Jie Tao, Hongsheng Chen, and Zuojia Wang
Opt. Lett. 47(11) 2790-2793 (2022)

Tuning Smith–Purcell radiation by rotating a metallic nanodisk array

Fei Chen, Ren-Hao Fan, Jun-Xuan Chen, Yu Liu, Ben-Qi Hou, Ru-Wen Peng, and Mu Wang
Opt. Lett. 48(8) 2002-2005 (2023)