Session: 01-02-02: Acoustic Metamaterials

Paper Number: 150398

150398 - Acoustic Lens-Based Underwater Double Vortex Generation via Field Multiplexing and 3d-Printed Technology 

In recent years, a considerable amount of research effort has been devoted to the study of acoustic vortices, driven by their potential applications across different disciplines. These applications range from non-contact biological cell manipulation to underwater communication, and ultrasound imaging that overcome the typical bounds set by wave diffraction. Acoustic vortices share similar characteristics with their optical counterparts, including a distinctive helical wavefront configuration and an intrinsic orbital angular momentum. This momentum can be imparted to various materials or objects via wave-matter interactions, highlighting the significance of these phenomena. Commonly, the application of such systems incorporates diverse methodologies, such as an array of transducers or Fresnel lenses, to produce a single vortex beam. However, this process is frequently linked with constraints in efficiency or output. Moreover, the process of expanding a single vortex beam into a three-dimensional form, as well as merging several vortex beams into a cohesive and integrated structure, presents notable difficulties that must be overcome to achieve enhanced efficiency and increased vortex energy output. In this research, an innovative approach that overcomes the limitations of conventional techniques, which often depend on intricate arrays of transducers and are restricted by the complexity of the system and the limitations of the operating environment is proposed. The proposed method involves the use of a 3D printed acoustic lens, designed based on field multiplexing, that can produce a double vortex pattern in water, with the added flexibility of an optional focusing profile. The performance of the proposed system was evaluated using finite element analysis using COMSOL 6.1 software and confirmed using underwater experimental measurements using a 3D scan stage equipped with a hydrophone needle. The numerical simulation confirmed that the performance of the suggested lens design, along with its different variations, was consistent with the anticipations drawn from theoretical insights and the existing literature regarding the single acoustic vortex as well as its counterpart double optical vortices. Experimental observations further supported the findings, demonstrating consonance with the theoretical and simulation outcomes in terms of phase variation as well as pressure field. Furthermore, results suggest that precise management of the pressurized area's strength and placement can be achieved by methodically modifying the location of the vortex axes. This novel approach offers considerable potential in improving the performance and flexibility of diverse applications by enabling the combination of a larger number of vortices with possible customization for a focalized behavior all within a single lens. Ultimately, the proposed system expands the functional applications of acoustic vortex technology, paving the way for a vast array of novel and creative uses.

Presenting Author: Chadi Ellouzi Rowan University

Presenting Author Biography: Chadi Ellouzi is currently a Ph.D. student in Mechanical Engineering at Rowan University, New Jersey. His research in the Functional Materials and Structures Laboratory at Rowan University focuses on two areas: (1) Acoustofluidics and its application in cell manipulation using bulk and surface acoustic waves; (2) Acoustic Metamaterials and Metasurfaces and their applications in the manipulation and control of acoustic waves. Chadi earned his B.S. in Aerospace Engineering from the University of Aviation and Technology, Tunisia in 2016, and his M.S. in Mechanical Engineering from Rowan University, New Jersey in 2021.

Authors:

Chadi Ellouzi Rowan University
Ali Zabihi Rowan University
Farhood Aghdasi Rowan University
Aidan Kayes Rowan University
Milton Rivera Rowan University
Chen Shen Rowan University