Experimental Verification of Reversed Cherenkov Radiation in Left-Handed Metamaterial

By using a phased electromagnetic dipole array to model a moving charged particle, we experimentally verified a reversed Cherenkov radiation in the left-handed media in the frequency range from 8.1 to 9.5 GHz. Our results demonstrate the feasibility of new types of particle detectors and radiation generators.

Figure 1

Configuration of the TM-LHM for experiment. In the top view, the dark (light) gray trips represent the copper printed on the top (bottom) of the substrate.

Figure 2

(a) The refractive index of the TM-LHM calculated from the measured results. The periodicity along the $y$ axis is $h=1.64\mathrm{mm}$. (b) The normalized far-field pattern of the prism experiment at 8.5 and 12 GHz, respectively.

Figure 3

The radiation of (a) a moving charged particle and (b) a phased dipole array composed of an infinite number of dipoles along the $z$ axis.

Figure 4

The normalized radiation pattern of the slot waveguide at 8.5 GHz. The inset shows a moving particle with radiation angle ${\theta }_c=58°$.

Figure 5

(a) Radiation passing through a slab of LHM (solid line) and RHM (dotted line). (b) Radiation passing through a prism of LHM (solid line) and RHM (dotted line). (c) Reversed CR is observed at 8.5 GHz. The inset illustrates the experimental setup. The source is plugged in port 1. (d) Sum of the radiation power in each angle in the negative band (solid line) and positive band (dashed line).