Conference Paper

Hybrid surface-bulk mode in periodic gratings

Moscow Steel & Alloys Inst.
DOI: 10.1109/ULTSYM.2001.991618 Conference: Ultrasonics Symposium, 2001 IEEE, Volume: 1
Source: IEEE Xplore

ABSTRACT We report on a SAW/BAW hybrid mode (SBH), which arises from
surface skimming bulk wave due to the trapping of its energy by a
counter-propagating surface wave (SAW) or leaky surface wave (LSAW), in
periodic grating structures. The SBH is the result of an interaction
between surface and bulk waves and exists within limited frequency
region, outside which it is decomposed into counterpropagating SAW and
BAW. Different examples of SBH mode illustrate interactions of BAW with
pure SAW, leaky and high-velocity leaky waves. The behavior of the SBH
mode was numerically investigated using the harmonic admittance
function. Calculation of velocity dispersion revealed the existence of
an additional branch of the dispersion curve, which refers to the SBH
mode. A stopband occurs due to SAW/BAW interaction and manifests itself
by a resonance of harmonic admittance at its lower edge, which can be
considered as the cut-off frequency of bulk wave radiation

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