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The dispersion characteristics (!-fl diagram) of a left-handed material (LHM) loaded helical guide is analytically solved and numerically computed for difierent medium properties as well as helical guide parameters. The modal behaviour of this structure has been studied with an aim to achieve ultra slow EM wave over wide bandwidth which flnds potential applications in optical switches and memories for optical processing. Signiflcant amount of phase velocity reduction has been achieved in comparison to when helix is in free space or loaded with normal dielectric medium. Other modal properties such as presence of two fundamental modes | backward and forward wave and their lower cut-ofi frequency (LCF) as well as the bandwidth spectrum is also revealed thoroughly.

ULTRA SLOW EM WAVE PROPAGATION CHARACTERISTICS OF LEFT-HANDED MATERIAL LOADED HELICAL GUIDE