Abstract-Multicolor Terahertz Frequency Mixer Using Multibunching of Free-Electron Beams

Weihao Liu, Linbo Liang, Qika Jia, Lin Wang, and Yalin Lu

https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.10.034031

We propose a free-electron-beam (FEB)-driven frequency mixer for generating terahertz-wave radiation. It employs an initial steady-current FEB to drive two cascaded gratings. On the first grating, the FEB is macrobunched by interacting with the self-stimulated backward slow waves. On the second grating, which operates at high harmonics of the first grating, it is further microbunched at high frequencies, producing mixed bunching components within the FEB. The multibunched FEB then generates a series of superradiant Smith-Purcell radiations from the second grating, achieving multicolor radiations in the terahertz region. The radiation can be tuned by adjusting the beam energy, covering the frequency range from 0.8 to 1.8 THz. It is a promising broad-tunable and multicolor terahertz source.

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Abstract-Two-dimensional reversed Cherenkov radiation on plasmonic thin-film

Weihao Liu, Linbo Liang, and Qika Jia

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-15-18216&origin=search

The reversed Cherenkov radiation is one of the most attractive research topics because of its unique characteristics and promising applications. It was generally believed that reversed Cherenkov radiations exist only in left-handed metamaterials (double negative mediums). In the present paper, we demonstrated that they can also be generated on plasmonic thin-films. Reversed Cherenkov radiations in the terahertz region and in the visible light region were achieved on the metamaterial thin-film and the metal thin-film, respectively. Their radiation frequencies and directions, which are interdependent with each other, are controllable. For the normal Cherenkov radiation, the wavelength on the thin-film increases with the frequency; whereas for the reversed Cherenkov radiation, the opposite is true. Theoretical analyses and simulations revealed that the normal or reversed Cherenkov radiation is generated depending on whether the forward or backward surface modes are excited on the plasmonic thin-film. Requirements of these reversed Cherenkov radiations were found out.

© 2017 Optical Society of America

Abstract-High-harmonic terahertz Smith-Purcell free-electron-laser with two tandem cylindrical-gratings

Linbo Liang, Weihao Liu, Qika Jia, Lin Wang, and Yalin Lu

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-3-2960

A modified Smith-Purcell free-electron-laser based on two tandem cylindrical-gratings is proposed. The preset grating with larger size, operating in the slow-wave condition, is to prebunch the initial continuous electron-beam, and the postpositive grating with smaller size, operating in the fast-wave condition, is used as the main radiator. Compared with traditional Smith-Purcell free-electron-lasers operating at the second harmonic of the bunched-beam, the present scheme operates at much higher harmonics, fifth and sixth harmonics have been achieved, and the radiation frequency is greatly increased consequently. And also the radiation power is enhanced by tens of times. Thus it could be developed as an efficient terahertz source with frequency being over 0.5 THz in practice.

© 2017 Optical Society of America

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