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

✍ Scribed by D. Li; M. Hangyo; Z. Yang; M.R. Asakawa; S. Miyamoto; Y. Tsunawaki; K. Takano; K. Imasaki

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
298 KB
Volume
637
Category
Article
ISSN
0168-9002

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✦ Synopsis

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.

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The radiation problem of the Smith᎐Purcell type is considered for the case where a line charge mo¨es, at a constant speed, parallel to a periodic strip grating o¨er a grounded dielectric slab. Numerical results pertaining to the radiation intensities and magnitudes of space harmonics for ¨arious cas