Abstract
The effective chiral (isotropic, noncentrosymmetric) composite can be fabricated by embedding the helical arrangement of microstructures in a host medium. In such a composite, six independent wavenumbers can be found from the dispersion equations. Two of the wavenumbers represent the nondispersive longitudinal waves while the remaining four represent the dispersive circularly polarized shear waves. According to the dispersion equations derived in our previous research that two cut-off frequencies divide the frequency spectrum of the transverse wavenumbers into three different groups, and hence the four transverse modes can only be distinguished in a specified frequency range. In this paper, we study the longitudinal plane wave propagation at an isotropic-effective chiral boundary. Numerical results show that an additional horizontal shear wave (SH wave), due to the mode conversion in the chiral composite, is enhanced between the first and second cut-off frequencies. The embedded handed microstructures may hence be properly chosen that the resulting composite is effectively chiral in a specified frequency range.
Published Version
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