Free electron terahertz wave radiation source with two-section periodical waveguide structures

Liu, Weihao; Gong, Sen; Zhang, Yaxin; Zhou, Jun; Zhang, Ping; Liu, Shenggang

doi:10.1063/1.3696969

Cited by 14 publications

(5 citation statements)

References 24 publications

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“…In 1998, J. Urata et al stated that SSPR could be generated once the interaction between the direct current (DC) electron beam and the surface wave is sufficiently large, and the radiation intensity was greatly enhanced at the specific harmonics [31]. Since then, THz sources based on SSPR were extensively studied and reported [32][33][34][35][36][37][38]. In this work, an emitter based on the helical grating integrated with SSPR is proposed to generate the THz vortex beams with tunable OAM.…”

Section: Introductionmentioning

confidence: 99%

A Terahertz Vortex Beam Emitter With Tunable Topological Charge and Harmonic Excitation

Zhang

Zhu

et al. 2021

J. Lightwave Technol.

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Terahertz (THz) vortex beams carrying orbital angular momentum (OAM) with high purity and tunable topological charge (TC) will undoubtedly bring extraordinary capacities for advanced imaging or communication systems. We propose a convenient and efficient method to generate a tunable and broadband vortex beam that is excited by superradiant Smith-Purcell radiation (SSPR) on a helical grating. This scheme fully explores the advantages of natural broadband evanescent wave carried by the electron beam and the Bloch's theorem regulated helical periodic systems. An explicit relation is established between the index of the spatial harmonic wave on the grating and the topological charge of the vortex beam. The electron energy in the SSPR can be customized to ignite the specific spatial harmonics and manipulate the OAM beam, accordingly. The separated radiation region also promises the high purity of the OAM spectrum. The harmonic excitation reduces the communality between the wavelength and the device size and alleviates the difficulty of device fabrication in the THz band. The proposed vortex scheme can not only be handily scaled to microwave and mid-infrared regions, but also bring possibilities to applications based on compact tunable vortex beam sources.

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Section: Introductionmentioning

confidence: 99%

A Terahertz Vortex Beam Emitter With Tunable Topological Charge and Harmonic Excitation

Zhang

Zhu

et al. 2021

J. Lightwave Technol.

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“…[9], [10] The dispersion equations of the TM modes in the PWS, which interact with the electron beam, can be expressed as: (The coordinates and parameters are shown in Fig.1(a) and we only consider the 2-D case, in which the field variation in 'z' direction is omitted. )…”

Section: Theoretical Analysismentioning

confidence: 99%

Terahertz wave radiation source based on two-section periodical waveguide structures

Liu

Gong

Zhang

et al. 2012

2012 37th International Conference on Infrared, Millimeter, and Terahertz Waves

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A terahertz wave radiation source with two-section periodical waveguide structure (PWS) is proposed and analyzed. The first section (section-I) is used to pre-modulate the electron beam, and the second section (section-II) is for terahertz wave generation. By means of theoretical analysis and numerical simulations, we demonstrate that the starting current density of the beam-wave interaction in section-II can be significantly reduced provided the operation frequency is the harmonic of electron beam's pre-modulation frequency. This kind of source can generate relatively high power terahertz wave radiation only need the moderate beam current density. And it is a promising tabletop and relatively high power terahertz radiation source for real applications.

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“…Liu also started an all electronic THz journal-International Journal of Terahertz Science and Technology (TST), and an electronic network for bringing together THz researchers-http://www.tstnetwork.org. Professor Liu's own research continues to emphasize electron beam structures and devices [50]- [53], but is now also focused on THz effects and applications, especially on surface plasmons [54]- [56] and new material systems like graphene [57], [58].…”

Section: Sheggang Liumentioning

confidence: 99%

Terahertz Pioneer: Shenggang Liu “China's Father of Vacuum and Microwave Electronics”

Siegel¹

2014

IEEE Trans. THz Sci. Technol.

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Free electron terahertz wave radiation source with two-section periodical waveguide structures

Abstract: Simulations of table-top watt-class 1THz radiation sources with two-section periodic structure

Cited by 14 publications

References 24 publications

A Terahertz Vortex Beam Emitter With Tunable Topological Charge and Harmonic Excitation

A Terahertz Vortex Beam Emitter With Tunable Topological Charge and Harmonic Excitation

Terahertz wave radiation source based on two-section periodical waveguide structures

Terahertz Pioneer: Shenggang Liu “China's Father of Vacuum and Microwave Electronics”

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