Terahertz generation from Dirac semimetals surface plasmon polaritons excited by an electron beam

Authors

Tao Zhao, Cooperative Innovation Centre Of Terahertz Science, University of Electronic Science and Technology of China
Min Hu, University of Electronic Science and Technology of China, Cooperative Innovation Centre Of Terahertz Science
Renbin Zhong, University of Electronic Science and Technology of China, Cooperative Innovation Centre Of Terahertz Science
Sen Gong, Cooperative Innovation Centre Of Terahertz Science, University of Electronic Science and Technology of China
C Zhang, University of WollongongFollow
Shenggang Liu, University of Electronic Science and Technology of China, Cooperative Innovation Centre Of Terahertz Science

RIS ID

131853

Publication Details

Zhao, T., Hu, M., Zhong, R., Gong, S., Zhang, C. & Liu, S. (2018). Terahertz generation from Dirac semimetals surface plasmon polaritons excited by an electron beam. 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) (pp. 435-436). United States: IEEE.

Abstract

A physical mechanism of coherent terahertz (THz) generation from surface plasmon polaritons (SPPs) is presented. In a structure of bulk Dirac semimetals (BDSs) film with dielectric medium loading, the excited SPPs by an electron beam can be directly transformed into THz radiation when meeting the Cherenkov radiation condition. The radiation frequency can be widely tuned by adjusting the beam energy and chemical potential. The radiation power density is enhanced over two orders, up to 10 ⁵ W/cm ² . This mechanism could provide a promising way to develop room temperature, tunable, coherent and intense THz radiation sources to cover the whole THz band.