Schematic diagram of the experimental setup for the generation of axially modulated plasma channels of Ref. 13.
Dispersion curves, vs , for a periodically modulated channel with normalized modulation size and , according to Eq. (21). Here, is the period of the channel.
Electron density vs frequency for channels with period and various channel widths. The index , where , gives the range of values for which the light line and dispersion curves cross.
Coupling coefficient and electron density vs frequency for channels with period , various channel widths and . Coupling minima occur for , where is an odd integer.
The ratio of power transferred to THz radiation to power transferred to plasma waves for laser pulses in channels with period , , and various channel widths. The ratio peaks for modes that satisfy , where is an even integer.
Depletion rate for modes with various widths for a laser pulse and .
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