Volume 111, Number 2, July 2015
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||05 August 2015|
Cyclotron electron beam excited surface plasmon polaritons coherent radiation
1 Terahertz Research Centre, School of Physical Electronics, University of Electronic Science and Technology of China Chengdu, Sichuan 610054, China
2 Cooperative Innovation Centre of Terahertz Science - Chengdu, Sichuan 610054, China
3 School of Physics and Institute for Superconducting and Electronic Materials, University of Wollongong Wollongong, New South Wales 2522, Australia
4 Research Institute of Superconductor Electronics, Nanjing University - Nanjing 210008, China
Received: 21 May 2015
Accepted: 13 July 2015
A physical mechanism of electron beam excitation of surface plasmon polaritons (SPPs) on the circular cylindrical structure and transformation into coherent radiation is proposed. Here SPPs on the circular cylindrical structures are excited by a cyclotron electron beam (CEB) rather than by the linearly moving electron beam (LEB). This change leads to an essential consequence due to the natural periodicity of in structure and CEB, and this dual natural periodicity makes the SPPs transformation possible and brings significant excellences. HEM hybrid modes and modes SPPs can be excited and propagate along a cyclotron trajectory together with the CEB to attract energy from CEB continuously to compensate the energy loss; the phase velocity of SPPs synchronizes the CEB; the process of the excitation and transformation is longer. Therefore, the transformed power density is enhanced and reaches up to . The cyclotron frequency of the electron beam is 1 THz, but the frequency regime of the SPPs and the radiation are much higher, up to hundreds of terahertz. The mechanism presented in this letter opens the way for developing the desired room temperature, powerful and coherent light radiation sources from the infrared to the ultraviolet frequency regime.
PACS: 42.72.-g – Optical sources and standards / 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 41.60.-m – Radiation by moving charges
© EPLA, 2015
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