![]() With this invention, by changing the modifier attached to the transducer the desired aperture can be easily attained. ![]() This is analogous to having to swap out lenses on a camera to change the lens's aperture. Currently, researchers and surgeons need to have many transducers of different sizes to produce acoustic waves with different apertures. The obstacles (steel pins) slow down the acoustic wave speed in order to bend the acoustic waves into curved rays.Īccording to post-doctoral scholar and the paper's lead author, Sz-Chin Steven Lin, while other types of acoustic metamaterials also could focus and defocus an acoustic beam to achieve beam aperture modification (although prior to this work no such beam modifier has been proposed), their device possesses the advantage of small size and high energy conservation. ![]() The acoustic beam aperture modifier is built upon gradient-index phononic crystals, in this case an array of steel pins embedded in epoxy in a particular pattern. Artificial structures are created in patterns that bend the acoustic wave onto a single point, and then refocus the acoustic wave into a wider or narrower beam, depending on the direction of travel through the proposed acoustic beam aperture modifier. ![]() The basic principles of optical metamaterials apply to acoustic metamaterials. Optical metamaterials have been widely studied in the past decade for applications such as cloaking and perfect lenses. ![]()
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