Smith-Purcell radiation from a grating of negative-index material

• DOI: 10.1016/j.nima.2011.02.022
• Publication Date: 2011-02-17T11:30:23Z
• Authors: D. Li; M. Hangyo; Z. Yang; M.R. Asakawa; S. Miyamoto; Y. Tsunawaki; K. Takano; K. Imasaki
• Keywords: Perfect conductor; Ultrasonic grating

Abstract Smith-Purcell radiation from an electric line charge that moves, at constant speed, parallel to a grating made of metamaterial with negative index is analyzed. Through theoretical analysis and computations, we show that the Smith-Purcell radiation is stronger from a grating of negative-index material, than that from a positive-index material and perfect conductor. Also, we found that the radiation strongly depends on the values of permeability and permittivity. Calculations on grating with saw-like profile and rectangular profile are also carried out and demonstrated.