Abstract
The threshold-less Cherenkov radiation (CR) is quite attractive due to its low-cost and compactibility. Here we proposed a new way to generate the coherent and threshold-less CR by using a sheet free-electron beam (FEB) to drive an oblique-lined subwavelength hole array (SHA). By periodically repeating the oblique-lined SHAs in the beam-moving direction, we could get a unique two-dimensional SHA (2D SHA), from which the Smith-Purcell radiation (SPR) can also be generated. The CR, combined with SPR, will become a focused directional coherent radiation with highly enhanced intensity.
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