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2017 ; 8
(ä): 14901
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Observation of the reversed Cherenkov radiation
#MMPMID28332487
Duan Z
; Tang X
; Wang Z
; Zhang Y
; Chen X
; Chen M
; Gong Y
Nat Commun
2017[Mar]; 8
(ä): 14901
PMID28332487
show ga
Reversed Cherenkov radiation is the exotic electromagnetic radiation that is
emitted in the opposite direction of moving charged particles in a left-handed
material. Reversed Cherenkov radiation has not previously been observed, mainly
due to the absence of both suitable all-metal left-handed materials for beam
transport and suitable couplers for extracting the reversed Cherenkov radiation
signal. In this paper, we develop an all-metal metamaterial, consisting of a
square waveguide loaded with complementary electric split ring resonators. We
demonstrate that this metamaterial exhibits a left-handed behaviour, and we
directly observe the Cherenkov radiation emitted predominantly near the opposite
direction to the movement of a single sheet electron beam bunch in the
experiment. These observations confirm the reversed behaviour of Cherenkov
radiation. The reversed Cherenkov radiation has many possible applications, such
as novel vacuum electronic devices, particle detectors, accelerators and new
types of plasmonic couplers.