Transverse spin and surface waves in acoustic metamaterials

Konstantin Y. Bliokh, Franco Nori

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    67 Citations (Scopus)

    Abstract

    We consider spin angular momentum density in inhomogeneous acoustic fields: evanescent waves and surface waves at interfaces with negative-density metamaterials. Despite being purely longitudinal (curl-free), acoustic waves possess intrinsic vector properties described by the velocity field. Motivated by the recent description and observation of the spin properties in elastic and acoustic waves, we compare these properties with their well-known electromagnetic counterparts. Surprisingly, both the transverse spin of evanescent waves and the parameters of surface waves are very similar in electromagnetism and acoustics. We also briefly analyze the important role of dispersion in the description of the energy and spin densities in acoustic metamaterials.

    Original languageEnglish
    Article number020301
    JournalPhysical Review B
    Volume99
    Issue number2
    DOIs
    Publication statusPublished - 3 Jan 2019

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