metamaterials meen 3344 christopher acosta. what are metamaterials? they are an assembly of several...
TRANSCRIPT
WHAT ARE METAMATERIALS?
They are an assembly of several individual elements
Engineered structures / split-ring resonators /LC circuits
Primary research of meta-material investigates negative refractive index
Permittivity and Permeability have to be both negative.
the meta-material used has to be smaller than the wavelength
understanding how the speed of light traveling though a refractive index can describe how light or any other radiation propagates though metamaterials.
ELECTROMAGNETIC WAVES
USES
The greatest potential of meta-materials is the possibility to create a structure with a negative refractive index
Sub wavelength imaging which is produced by having a negative refractive index, an optical property creating a Super lenses
Phased array technology that could render perfect holograms on a 2D display
Cloaking devices, microwave invisibility cloaks
HOW DO METAMATERIALS ACHIEVE INVISIBILITY• light waves can be guided by the metamaterials around the
object and back to its original course
• microwaves wavelengths are measured in centimeters scientists have the technology to create metamaterials small enough to manipulate them, moving waves around an object
LIMITATIONS
• Light wavelengths are measured in nanometers (billionths of a meter), and the metamaterials needed to block light must be even smaller than that
• don't currently have the technology to manufacture materials on the small scale required to manipulate light waves
• cloaking device would have to be arranged to manipulate light on the entire visible spectrum, because different colors exist on different wavelengths
• Cloaking devices would plunge a person on the inside into darkness
• By continuing research and funding for metamaterials, these challenges can soon be overcome
WORK SITED
• William D. Callister, Jr. David G.Rethwisch. Fundamental of Materials Science and Engineering an Intergrated Approach. third edition. Danvers: John Wiley & sons, 2008.
• Maryland, University of. Material Science and Engineeering: Metamaterial . 2006-2001. A.
• James Clark School of Engingeering. <http://www.mse.umd.edu/whatismse/metamaterials.html>.
• Overheim, R.Daniel and David L.Wagner. Light And Color. Ed. Edinboro State College. Jhon Wiley & Sons, INC., 1982.
• Pendry, J.B. superlens - wikipedia, the free encyclopedia. 1 september 2012. 3 september 2013 <http://en.wikipedia.org/wiki/superlens>.
• Rincon, Paul. "Experts test Cloaking technology." Science reporter, BBC News (2006).