Asset Details
Do you wish to reserve the book?
Soft 3D acoustic metamaterial with negative index
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
Soft 3D acoustic metamaterial with negative index
Do you wish to request the book?
Soft 3D acoustic metamaterial with negative index
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
Soft 3D acoustic metamaterial with negative index
2015
Overview
Soft acoustic metamaterials that consist of a concentrated suspension of macroporous microbeads and that show a broadband negative acoustic refractive index are now demonstrated.
Many efforts have been devoted to the design and achievement of negative-refractive-index metamaterials since the 2000s
1
,
2
,
3
,
4
,
5
,
6
,
7
,
8
. One of the challenges at present is to extend that field beyond electromagnetism by realizing three-dimensional (3D) media with negative acoustic indices
9
. We report a new class of locally resonant ultrasonic metafluids consisting of a concentrated suspension of macroporous microbeads engineered using soft-matter techniques. The propagation of Gaussian pulses within these random distributions of ‘ultra-slow’ Mie resonators is investigated through
in situ
ultrasonic experiments. The real part of the acoustic index is shown to be negative (up to almost − 1) over broad frequency bandwidths, depending on the volume fraction of the microbeads as predicted by multiple-scattering calculations. These soft 3D acoustic metamaterials open the way for key applications such as sub-wavelength imaging and transformation acoustics, which require the production of acoustic devices with negative or zero-valued indices.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
