Design and demonstration of broadband thin planar diffractive acoustic lenses
Abstract
We present here two diffractive acoustic lenses with subwavelength thickness, planar profile, and broad operation bandwidth. Tapered labyrinthine unit cells with their inherently broadband effective material properties are exploited in our design. Both the measured and the simulated results are showcased to demonstrate the lensing effect over more than 40% of the central frequency. The focusing of a propagating Gaussian modulated sinusoidal pulse is also demonstrated. This work paves the way for designing diffractive acoustic lenses and more generalized phase engineering diffractive elements with labyrinthine acoustic metamaterials.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 08, 2014
- Source ID
- 10.1063/1.4895619
Entities
People
- Adam Konneker
- Bogdan-ioan Popa
- Steven A. Cummer
- Wenqi Wang
- Yangbo Xie
Organizations
- Duke University
- Office of Naval Research