Abstract
The steerable coherent terahertz radiation is very attractive for practical applications. To achieve this goal, we propose to use a uniformly-moving sheet electron-beam to drive two-dimensional alternated arrays of sub-wavelength holes on a conductor disc (CD). Each sub-wavelength hole has a series of radiative resonant modes. The emissions from all the sub-wavelength holes can constructively interfere at specific directions, leading to directional coherent radiations in the three-dimensional space. This radiation can be realtimely steered to any directions by simply rotating the CD. It will promisingly be developed as new types of multi-functional terahertz sources and devices.
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