光学
太赫兹辐射
轴棱锥
激光束质量
贝塞尔光束
发电机(电路理论)
贝塞尔函数
梁(结构)
平方米
光束直径
材料科学
物理
功率(物理)
激光器
量子力学
激光束
作者
Jiusheng Li,Jian Chen,D. P. Zhang
出处
期刊:Applied Optics
[The Optical Society]
日期:2023-05-22
卷期号:62 (16): 4197-4197
被引量:1
摘要
The Bessel beam has broad application prospects in wireless energy transmission and high-speed communications. The traditional Bessel beam generation method has the problems of large volume, low efficiency, and complex manufacturing. To solve the above problems, we present a terahertz Bessel beam generator based on the reflective metasurface, which is composed of a metal pattern, dielectric layer, and bottom metal plate. Under the incidence of right circularly polarized (RCP) wave, the zero-order Bessel beam and zero-order symmetric double Bessel beam are generated. It can be found that the bottom angle of the axicon of the first-order Bessel beam is inversely proportional to the propagation distance of the Bessel beam. Comparing the electric field intensity distribution, phase distribution, and mode purity of the second-order Bessel beam and the second-order vortex beam in different observation planes, it can be seen that the energy of the higher-order Bessel beam is more concentrated and the field distribution is more stable than those of the ordinary vortex beam. The reflective terahertz Bessel beam generator has potential application value in terahertz wireless communications, measurement, radar detection, and imaging.
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