In bulk LN, polaritons at low wave vectors move forward at an angle of approximately 26°. As the polariton
wave vector increases, the phase velocity is reduced and so is the forward propagation angle.Thus, in bulk crystals the forward component must be accounted for in order to obtain the complete polariton wave vector. Meanwhile, in films whose thickness d is on the order of or less than the polariton wavelength, polaritons are guided within the film plane and travel in the direction of the waveguide propagation constant.
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