Generating Bessel beams with broad depth-of-field by using phase-only acoustic holograms.

ABSTRACT: We report zero-th and high-order acoustic Bessel beams with broad depth-of-field generated using acoustic holograms. While the transverse field distribution of Bessel beams generated using traditional passive methods is correctly described by a Bessel function, these methods present a common drawback: the axial distribution of the field is not constant, as required for ideal Bessel beams. In this work, we experimentally, numerically and theoretically report acoustic truncated Bessel beams of flat-intensity along their axis in the ultrasound regime using phase-only holograms. In particular, the beams present a uniform field distribution showing an elongated focal length of about 40 wavelengths, while the transverse width of the beam remains smaller than 0.7 wavelengths. The proposed acousti

SUBMITTER: Jimenez-Gambin S 

PROVIDER: S-EPMC6934506 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature