Abstract
We introduce subsonic nondiffracting waves which—unlike the ordinary supersonic nondiffracting waves—evolve periodically under propagation. Such pulse-like waves have a subsonic uniformly propagating ‘core’, which is modulated by a supersonic plane wave. The subsonic core may also be considered an envelope for a truncated Bessel beam and subsonic nondiffracting waves may be used to describe signal propagation within Bessel beams.
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