Design and demonstration of broadband thin planar diffractive acoustic lenses
Authors:
- 8 September 2014
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 105 (10) , 101904
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.Keywords
Funding Information
- Office of Naval Research (N00014-13-1-0631)
This publication has 22 references indexed in Scilit:
- Negative refraction of acoustic waves using a foam-like metallic structureApplied Physics Letters, 2013
- Acoustical Imaging2012
- Anisotropic Mass Density by Radially Periodic Fluid StructuresPhysical Review Letters, 2010
- Basics of Biomedical Ultrasound for Engineers2010
- Experimental demonstration of an acoustic magnifying hyperlensNature Materials, 2009
- Focusing Ultrasound with an Acoustic Metamaterial NetworkPhysical Review Letters, 2009
- Acoustic metafluidsThe Journal of the Acoustical Society of America, 2009
- Ultrasonic metamaterials with negative modulusNature Materials, 2006
- Double-negative acoustic metamaterialPhysical Review E, 2004
- Locally Resonant Sonic MaterialsScience, 2000