...or how to make an invisibility cloak (without photoshop).
...or how to make an invisibility cloak (without photoshop).
...artificial materials engineered to have properties that may not be found in nature - Metamaterials - Wikipedia
...any inhomogeneous material. - Milton, 2007
When waves interact with metamaterials new phenomena appear that do not exist in homogenous materials.
Example: Air with suspended droplets of water and light waves:
Vibration of the electromagnetic field = 'light'.
Typical wavelength: 100s of nm ($10^{-7}$ m).
Vibrations in matter = sound / acoustic / earthquake / elastic / water waves.
Typical wavelengths of mm to 100s of km ($10^{-2}$ m).
Seismic s-wave
[L. Braile, 2004]
Sound wave / seismic p-wave
Inhomogeneous: materials with different resistances to wave deformation.
Designed and fabricated an elastic cloak from an engineered lucite sheet:
Results:
