Abstract-Contribution of the optical rectification in terahertz radiation driven by two-color laser induced plasma

Hang Li, Ying Zhang, Wenfeng Sun, Xinke Wang, Shengfei Feng, Peng han, Jiasheng Ye, and Yan Zhang

Schematic diagram of the experimental setup.

https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-28-4-4810

In the terahertz (THz) generation driven by two-color laser pulses, the THz wave radiated from the BBO crystal as the effect of the optical rectification is always assumed to be less and negligible. In this paper, the contribution of the optical rectification in the THz radiation driven by two-color laser pulses has been determined quantitatively, by the crucial factors including BBO crystal rotation angle, the pump power of laser, and the numerical aperture of lens. The experimental and simulation results show that the above related factors have dramatically affected the intensity ratio of the THz waves from the plasma and BBO crystal. It is helpful for understanding the mechanism of THz generation from air plasma.

© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Abstract-Dual-wavelength Terahertz Metalens Based on Geometric Phase Metasurface

Tailei Wang, Hang Li, Rensheng Xie, Sensong An, Shouzheng Zhu, Guohua Zhai, Wei Guo, Hualiang Zhang, and Jun Ding

https://www.osapublishing.org/abstract.cfm?uri=CLEO_AT-2019-JTh2A.14

We proposed a novel dual-wavelength meta-atom, which could be used to independently modulate the geometric phase of the circularly polarized incident wave at two terahertz frequencies. A prototype dual-wavelength metalens has been designed and verified at the terahertz regime.

© 2019 The Author(s)