Abstract
The fundamental properties for the spin and orbital angular momentum are analyzed using acoustic evanescent Bessel beams. The calculations reveal that the transversal spin, the canonical momentum, and the orbital angular momentum are proportional to the ratio l/ω where l is the topological charge and ω the angular frequency. This analysis shows that the complex acoustic Poynting vector and spin density exhibits interesting features related to the electromagnetic case.
Highlights
The wave propagation spin using an evanescent wave has been extensively explored [1, 2, 3, 4, 5]; currently, there are many applications where the manipulation of light have an important role, such as topological photonics [6], chiral quantum optics [7]
A qualitative description for the dynamical quantities between the acoustic field and the electromagnetic case [27, 28]; The results shows that an evanescent wave, the traversal acoustic spin vector and canonical momentum are proportional to the factor l/ω, as predicted in acoustics vortex propagation in free space [15, 16, 17, 29]
This work presented fundamental local properties for the acoustic field: energy, canonical momentum, spin angular momentum densities, and the complex acoustic Poynting vector for evanescent Bessel beam, which resulted in an agreement
Summary
The wave propagation spin using an evanescent wave has been extensively explored [1, 2, 3, 4, 5]; currently, there are many applications where the manipulation of light have an important role, such as topological photonics [6], chiral quantum optics [7]. An overview of the analytical strategies that employ evanescent-wave optical biosensors to deal with the complexities and challenges of effective Nucleic Acids, DNA, and RNA detection was presented by [26] In this direction, our contribution in this work is to study evanescent wave following the approach presented in [11, 12], which allows describing the arbitrary acoustic field and deriving quantities such as the time average energy density, the Poynting vector, the canonical momentum, the spin, and orbital angular momentum.
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