Metamaterials are artificial materials engineered to provide properties not found in nature. They derive their properties from their structure rather than composition. Metamaterials can create negative indexes of refraction and guide waves in desired directions. They have applications in antennas, invisibility cloaking, and frequency selective surfaces. The document discusses the history and types of metamaterials, including electromagnetic and acoustic varieties. It outlines previous work on cubic metamaterials and the presenter's objectives to further explore their properties and applications through modeling and simulation.

1. METAMATERIALS
©Kostiantyn Denysenko 2012
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2. Scope
What are Metamaterials?
How they work?
Types
Limitations
FSS
My work
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3. What are Metamaterials?
Metamaterials are artificial materials engineered to provide
properties which may not be readily available in nature. These
materials usually gain their properties from structure rather
than composition, using the inclusion of small inhomogeneities
to enact effective macroscopic behavior.
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4. History
– Theoretical design by Victor Veselago in 1968
– Predicted possibility of opposite
properties for artificial materials
V.G.Veselago
– Dr. John Pendry showed practical method
of making metamaterials in 1999
Sir J.Pendry
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5. How they work
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6. Normally, waves propagate and interact
with different media according to Snell’s law
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7. Metamaterials can :
– create negative index of refraction
– guide wave in desired direction
Note: units of the cell must be small
with respect to wavelength
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8. Types
Electromagnetic
Acoustic
Seismic
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9. Electromagnetic
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10. Negative Refractive Index
Positive Refractive Index Negative Refractive Index
Refractive
Index Magnetic
Electric
permittivity permeability
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11. Antenna Design
– Negative index of refraction means more wave bending which means smaller antenna
– Manipulate radiation pattern
– Can double frequency range
– Increase radiated power
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12. Invisibility
No cloak Cloaked
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13. Limitations
– Small wavelengths require very small units
– Production technologies
– Different wavelength requires new structure
– Frequency selective surfaces
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14. FSS
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15. What is FSS?
– FSS is any surface construction
designed as a filter for plane waves
– Angular/Frequency dependance
– Band pass/Band stop behavior
– FSS degrees of freedom
– Element type
– Element shape, size, loading
– Element spacing and orientation
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16. Abstractions
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17. My Work
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18. What I started with
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19. Objectives
– Explore properties of the cube
– Explore areas of application
– Create algorithm to build structure
for specific applications
– More?
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20. They did it before me
– Created the cube
– Planarised unit cell
– Simulated an array
of 24X24X6 cells
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21. What they didn’t do
– Never finished the planarised model
– Didn’t explore tuning properties
– Didn’t apply reconfiguring paradigm
– More?
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22. What we model now
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23. And we have some results
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24. Questions?
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25. Thank You!
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