Abstract
Coherent terahertz radiation from multiple electron beams excitation within a plasmonic crystal-like structure (a three-dimensional holes array) which is composed of multiple stacked layers with 3 × 3 subwavelength holes array has been proposed in this paper. It has been found that in the structure the electromagnetic fields in each hole can be coupled with one another to construct a composite mode with strong field intensity. Therefore, the multiple electron beams injection can excite and efficiently interact with such mode. Meanwhile, the coupling among the electron beams is taken place during the interaction so that a very strong coherent terahertz radiation with high electron conversion efficiency can be generated. Furthermore, due to the coupling, the starting current density of this mechanism is much lower than that of traditional electron beam-driven terahertz sources. This multi-beam radiation system may provide a favorable way to combine photonics structure with electronics excitation to generate middle, high power terahertz radiation.
Highlights
Terahertz (THz) frequency band has been demonstrated of great interest for applications in biomedical imaging, communication, and security checking as the electromagnetic (EM) waves have various physical properties merging photonics and electronics[1,2,3]
Such as refs 24–27 suggested two sheet e-beams interaction with mimicking surface plasmons (MSPs); ref. proposed two sheet e-beams interaction within a composite sandwich structure; ref. reported three- and six-beam folded waveguide traveling-wave tube (TWT) operating at fundamental mode; refs 30–34 presented two and three e-beams interaction with higher order mode; and ref. 35 theoretically investigated wave coupling in multi-beam TWTs
In ref. 16, we have proposed the interaction between a square-shaped e-beam with guiding wave mode in multiple stacked layers with single sub-wavelength holes (MSLS)
Summary
Multiple Electron Beams Excitation within a Plasmonic Crystal-like received: 21 June 2016 accepted: 15 December 2016. Due to the coupling, the starting current density of this mechanism is much lower than that of traditional electron beam-driven terahertz sources This multi-beam radiation system may provide a favorable way to combine photonics structure with electronics excitation to generate middle, high power terahertz radiation. Among the VEDs, the linear electron beam (e-beam)-driven sources have been actively investigated in the THz region[13,14,15,16,17,18,19] For these radiation sources, with increased working frequency, higher starting current density is required and lower radiated power obtained[17]. In this paper, we have proposed an efficient way to generate THz wave from the multi-beam interaction in such plasmonic crystal-like structure. The results show that such radiation source system leads to a significant improvement with higher efficiency and lower starting current density than traditional e-beam-driven sources
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