Surface-coupling of Cerenkov radiation from a modified metallic metamaterial slab via Brillouin-band folding

Bera A., Barik R.K., Sattorov M., Kwon O., Min S.-H., Baek I.-K., Kim S., So J.-K., Park G.-S.
Optics Express, 22(3), 3039(2014)
DOI: 10.1364/OE.22.003039

Abstract

metallic metamaterials with positive dielectric responses are promising as an alternative to dielectrics for the generation of Cerenkov radiation [J.-K. So et al., Appl. Phys. Lett. 97(15), 151107 (2010)]. We propose here by theoretical analysis a mechanism to couple out Cerenkov radiation from the slab surfaces in the transverse direction. The proposed method based on Brillouin-zone folding is to periodically modify the thickness of the metamaterial slab in the axial direction. Moreover, the intensity of the surface-coupled radiation by this mechanism shows an order-of-magnitude enhancement compared to that of ordinary Smith- Purcell radiation. © 2014 Optical Society of America.