Phononic crystals bring sound to a focus
Sep 21, 2004
Three years ago researchers at the University
of California at San Diego created a
storm in the world of optics when they
announced that they had made a material
that exhibited negative refraction. Light
rays entering such a "negative index" material
are not bent towards the normal -- as
happens in all known materials in nature --
but beyond the normal. Now physicists in
China and Canada have demonstrated the
equivalent phenomenon with sound waves
in a material known as a "phononic crystal".
Please sign in
To continue reading this article please sign in below.
Not registered with physicsworld.com?
Register now
for FREE access to all In depth articles plus many other benefits. Just complete the quick and simple form.
Register now It's free!
Already registered? Then there's no need to do a thing, just sign in below.
![[IOP]](http://images.iop.org/cws/icons/themes/phw/colophon-small.png){kind=icon}
