Abstract-Electron-Beam-Driven Enhanced Terahertz Coherent Smith-Purcell Radiation Within a Cylindrical Quasi-Optical Cavity

Zhou, Y. ;  ; Zhang, Y. ; Liu, S.,
Terahertz Science and Technology Research Center, University of Electronic Science and Technology of China, Chengdu, China

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7404045&filter%3DAND%28p_IS_Number%3A5741778%29

In this paper, an electron-beam-driven enhanced terahertz (THz) coherent Smith-Purcell radiation (SPR) from the interaction between cylindrical surface wave and annular electron beam within a cylindrical quasi-optical cavity is presented. The results show that the quasi-optical cavity plays a very important role in the coherent SPR resonance and energy feedback which leads to an enhanced coherent SPR with relatively high efficiency and low current density. Moreover, it is found that the radiated field intensity and field energy of the coherent SPR with the quasi-optical cavity has been improved five times and almost one order of magnitude, respectively, compared with those without the cavity. This system provides an alternative way for high-performance THz sources.

Abstract-Freely Tunable Broadband Polarization Rotator for Terahertz Waves

Fan, R.-H., Zhou, Y., Ren, X.-P., Peng, R.-W., Jiang, S.-C., Xu, D.-H., Xiong, X., Huang, X.-R. and Wang, M. (2014), Freely Tunable Broadband Polarization Rotator for Terahertz Waves. Adv. Mater.. doi: 10.1002/adma.201404981

Author Information

1. 1
   National Laboratory of Solid State Microstructures and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China
2. 2
   Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, USA

^*E-mail: rwpeng@nju.edu.cn, xiahuang@aps.anl.gov, muwang@nju.edu.cn

Publication History

1. Article first published online: 28 DEC 2014
2. Manuscript Revised: 21 NOV 2014
3. Manuscript Received: 31 OCT 2014

http://onlinelibrary.wiley.com/doi/10.1002/adma.201404981/abstract

For the first time a freely tunable polarization rotator for broadband terahertz waves is demonstrated using a three-rotating-layer metallic grating structure, which can conveniently rotate the polarization of a linearly polarized terahertz wave to any desired direction with nearly perfect conversion efficiency. This low-cost, high-efficiency, and freely tunable device has potential applications as material analysis, wireless communication, and THz imaging.

Abstract-Terahertz free electron superradiation from mimicking surface plasmons-two electron beams interaction within a 3-mirror quasi-optical cavity

Ya-Xin Zhang, Y. Zhou, L. Dong, and Sheng-Gang Liu

Terahertz Science and Technology Research Center, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China 

http://apl.aip.org/resource/1/applab/v102/i21/p211104_s1?isAuthorized=no

Interaction between mimicking surface plasmons and electron beams provides a good opportunity to develop terahertz (THz) radiation sources. In this paper, such an interaction in a special 3-mirror quasi-optical cavity is presented and explored. The 3-mirror quasi-optical cavity acts as a resonant tunable system, the resonance frequency of which can be tuned by adjusting the distance between mirrors. The study demonstrated THz free electron superradiation from the interaction of mimicking surface plasmons and two electron beams that formed a resonance within the structure, with the 3-mirror cavity enhancing the intensity of superradiation. Moreover, this system can work in the high-harmonic superradiation region with relatively high efficiency and low current density. This concept thus shows the application potential for electron-beam-driven terahertz sources.

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