Assumptions: long-wavelength, isotropy, u = 0 for optical modes. This chapter considers a slab of polar material bounded in the z direction at z = ±L/2 and unbounded otherwise. It covers: triple hybrid model for optical modes; energy normalization; reduced boundary conditions; barrier modes; dispersion and wave patterns; acoustic hybrids; sTA and p modes; families of guided p modes; and interface acoustic waves.
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