Transverse spin and surface waves in acoustic metamaterials Article Swipe
YOU?
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· 2019
· Open Access
·
· DOI: https://doi.org/10.1103/physrevb.99.020301
· OA: W2900640369
We consider spin angular momentum density in inhomogeneous acoustic fields:\nevanescent waves and surface waves at interfaces with negative-density\nmetamaterials. Despite being purely longitudinal (curl-free), acoustic waves\npossess intrinsic vector properties described by the velocity field. Motivated\nby the recent description and observation of the spin properties in elastic and\nacoustic waves, we compare these properties with their well-known\nelectromagnetic counterparts. Surprisingly, both the transverse spin of\nevanescent waves and the parameters of surface waves are very similar in\nelectromagnetism and acoustics. We also briefly analyze the important role of\ndispersion in the description of the energy and spin densities in acoustic\nmetamaterials.\n
