Acoustic Cloaking Links

The Acoustic Cloaking Page

These numerical simulations are based on the paper Acoustic cloaking theory by Andrew Norris. They demonstrate the raypaths in a non-radially symmetric cloak. The egg-shaped region in the center is acoustically invisible.

This shows the sequence of wavefronts as a plane wave transmits through a non-radially symmetric acoustic cloak. Note the rays outside the cloak are straight, while those inside go around the cloak. At about 9 seconds the wavefront is split or torn apart on the incident side of the inner surface of the cloak, and it reattaches on the opposite soon at about 11 seconds.

The cloak is transparent no matter what the direction of incidence.

This video shows the ray paths for plane waves from all directions. Instead of rotating the plane wave I have rotated the cloak, keeping the wave incident from the left.

Acoustic cloaking in the news

  • Acoustic cloaking material 'is inevitable' Daily Telegraph 4/28/08
  • Invisibility Rules the Waves Physics World 2/29/08
  • Steps Towards Warship Invisibility Science Daily 2/28/08
  • Scientists Create the Sound of Silence Daily Telegraph 2/15/08
  • Acoustic ``Invisibility" Cloaks Possible, Study Says National Geographic 1/23/08
  • How to Make a Submarine Disappear Science/AAAS 1/14/2008
  • Acoustic metamaterials: Silence all around Nature/China 11/14/07
  • Hiding in Plain Sound ONR/NRE Navigator 10/19/07
  • How to Build an Acoustic Invisibility Cloak New Scientist 8/31/07
  • The mathematics of cloaking Physorg Dec. 2006

    EM cloaking in the news
    Google "invisibility cloak" to find plenty of articles, such as

  • Navy Battleship with a Cloaking Device /io9.com March 2008
  • Researchers Create 'Invisibility Cloak' For Colloidal Nanoparticles Physorg.com March 2008
  • Out of Sight - Physicists get serious about invisibility shields Science news July 2006
  • Vanishing Actor: Physicists unveil first invisibility cloak Science news Oct. 2006
  • Experts test cloaking technology BBC Oct. 2006

    Sites related to cloaking

  • David R. Smith at Duke lots of links to interesting stuff on cloaking and metamaterials
  • Cloaking and electromagnetic wormholes
  • Invisibility - Ulf Leonhardt
  • Is it possible to make a cloaking device? Howstuffworks.com

    Papers

  • Cloaking
  • Metamaterials
  • Loading Clusty Cloud ...

    All of this cloaking is completely different from the virtual reality 'invisibility coat' that uses a camera behind the person and a projector in front. Although you have to admit it is pretty cool.


    Click on the image to go to some videos of the same technology.











    Support from the National Scince Foundation is gratefully acknowledged