Photonics Research, Volume. 8, Issue 8, 1309(2020)
Vortex Smith–Purcell radiation generation with holographic grating On the Cover
Fig. 1. Schematic diagram of generating vortex Smith–Purcell radiation (with a TC of
Fig. 2. Simulation of a THz OAM wave with TCs of (a) 0 (traditional SPR from periodic grating), (b) 1, (c) 2, (d) 3, (e) 4, and (f) 10. Left: Top view of the gratings (gray part represents PEC, white part represents vacuum), in which the teeth of the fork structures are marked. Middle: Side view of the
Fig. 3. Simulation of THz VSPR with mixed mode of
Fig. 4. OAM wave at
Fig. 5. OAM wave generated by free electrons with bunching frequency of (a) 0.68 THz, (b) 0.6 THz, and (c) 0.43 THz. Left,
Fig. 6. (a) Schematic of the Huygens construction for conventional SPR with a radiation angle of
Fig. 7. OAM wave generated in different frequency regions. The field plotted in each figure is normalized individually. The holographic gratings for different frequencies have similar profile to the left figure in Fig.
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Mengxuan Wang, Fang Liu, Yuechai Lin, Kaiyu Cui, Xue Feng, Wei Zhang, Yidong Huang. Vortex Smith–Purcell radiation generation with holographic grating[J]. Photonics Research, 2020, 8(8): 1309
Category: Optoelectronics
Received: Apr. 13, 2020
Accepted: Jun. 5, 2020
Published Online: Jul. 14, 2020
The Author Email: Fang Liu (liu_fang@tsinghua.edu.cn)