Direct Generation of Radially Polarized X-Shape Terahertz Pulse via Focusing Cherenkov Radiation

被引：0

作者：

Liu, Weihao ^{[1
]}

Liu, Minghao ^{[1
]}

Tao, Zhi ^{[1
]}

Cheng, Ying ^{[1
]}

Lu, Yalin ^{[2
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Elect & Informat Engn, Nanjing 211106, Jiangsu, Peoples R China

[2] Univ Sci & Technol China, Hefei Natl Res Ctr Phys Sci Microscale, Hefei 230029, Anhui, Peoples R China

来源：

IEEE TRANSACTIONS ON ELECTRON DEVICES | 2024年 / 71卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Terahertz radiation; Terahertz communications; Electrons; Focusing; Laser beams; Dielectrics; Mathematical models; Cherenkov radiation (CR); terahertz (THz) pulse; X-wave; BESSEL BEAMS; DYNAMICS; FIELD;

D O I：

10.1109/TED.2024.3403537

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Radially polarized X-shaped terahertz (THz) pulses (RPXTPs) have unique properties such as spatio-temporal localization, self-reconstruction, nondispersion, and superluminality, making them attractive for various applications. However, the direct generation of RPXTPs is a challenging task that has not yet been achieved. We propose a set of easily implementable schemes to directly generate RPXTPs using either a pencil beam or a ring beam of electrons to drive a modified axicon. Cherenkov radiation is excited in the modified axicon in the THz region and then focused in the forward region, allowing direct generation of RPXTPs. We demonstrate the generation of single-cycle broadband RPXTPs with tunable spectral range, focusing depth, and pulse intensity. The field strength reaches tens of MV/m, much higher than that obtained by most available indirect methods. This high-intensity RPXTP has potential applications in THz spectroscopy, THz imaging, light-matter interactions, and THz-driven particle accelerators.

引用

页码：4329 / 4335

页数：7