Metamaterials are artificial materials engineered to have properties not found in nature. They are composed of periodic microscopic structures that interact with electromagnetic waves in ways that allow properties like a negative index of refraction. This presentation outlines metamaterials, how they achieve unusual properties, their timeline of development, applications like cloaking and terahertz devices, and remaining challenges in fabricating optical metamaterials.
DPS material
DNG material ( Do not depend on the chemical composition, Depend on the geometry of the structure units, Metamaterials are artificial engineered composite structures, Not commonly found in nature)
MNG material
ENG material
Metematterials are artificial structures designed to have unique properties not found in common materials such as negative refractive index, elasticity, can modify sound waves, enhance radiated power ect.
Meta materials are advance materials with negative refractive index, they show excellent applications like cloaking effect, super lens, WMD detectors also flying doughnut etc. They are very futuristic . This presentation explains the basic definition, history, scientific principle and its applications etc.
DPS material
DNG material ( Do not depend on the chemical composition, Depend on the geometry of the structure units, Metamaterials are artificial engineered composite structures, Not commonly found in nature)
MNG material
ENG material
Metematterials are artificial structures designed to have unique properties not found in common materials such as negative refractive index, elasticity, can modify sound waves, enhance radiated power ect.
Meta materials are advance materials with negative refractive index, they show excellent applications like cloaking effect, super lens, WMD detectors also flying doughnut etc. They are very futuristic . This presentation explains the basic definition, history, scientific principle and its applications etc.
This ppt give an idea about what metamaterial is? how are they formed? and introduces to the techniques to analyze them. A few applications of metamaterials are also mentioned.
Using Metamaterials as Optical Perfect AbsorberSepehr A. Benis
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
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Metamaterial is an arrangement of artificial structural elements, designed to achieve advantageous and unusual electromagnetic properties
meta = beyond (Greek)
Using Metamaterial as Optical Perfect AbsorberSepehr A. Benis
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
Presentation of PhD Thesis: "A perspective on metasurfaces, circuits, holograms and invisibility". Carlo Andrea Gonano, Politecnico di Milano, Italy, 26 January 2016.
This ppt give an idea about what metamaterial is? how are they formed? and introduces to the techniques to analyze them. A few applications of metamaterials are also mentioned.
Using Metamaterials as Optical Perfect AbsorberSepehr A. Benis
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
Metamaterial is an arrangement of artificial structural elements, designed to achieve advantageous and unusual electromagnetic properties
meta = beyond (Greek)
Using Metamaterial as Optical Perfect AbsorberSepehr A. Benis
Article review and presentation on basics of using metamaterials as optical perfect absorbers
Metamaterial Course Final Project ( Optional Graduate Course )
Dr. Leyla Yousefi
Presentation of PhD Thesis: "A perspective on metasurfaces, circuits, holograms and invisibility". Carlo Andrea Gonano, Politecnico di Milano, Italy, 26 January 2016.
Spintronics also known as spin electronics, is the study of the intrinsic spin of the electron and its associated magnetic moment, in addition to its fundamental electronic charge, in solid-state devices
A brief overview of the processes involved in nanolithography & nanopatterning. It mainly discusses the steps, mechanism & instrumentation of the electron beam lithography in detail. It also gives a small view on other technologies as well.
Introduction to nanoscience and nanotechnologyaimanmukhtar1
Introduction of nanoscience/nanotechnology ,properties/potential applications of nanomaterials and electrodeposition of metal single component and alloy nanowires in AAO template
2. Presentation Outline
Introduction to Metamaterials
Definition of Metamaterial
How Metamaterials work
Time Line
What are Negative Index Metamaterials (NIMs)?
Negative Index Metamaterial Features
Negative Refraction
Applications
Conclusion
4. Introduction to Metamaterials:
Why are they called Metamaterials?
Existing materials only exhibit a small subset of electromagnetic
properties theoretically available
Metamaterials can have their electromagnetic properties altered
to something beyond what can be found in nature.
Can achieve negative index of refraction, zero index of refraction,
magnetism at optical frequencies, etc.
6. Definition of Metamaterial:
“Metamaterial” coined in the late 1990’s
Any material composed of periodic, macroscopic
structures so as to achieve a desired electromagnetic
response can be referred to as a Metamaterial
very broad definition:
Others prefer to restrict the term Metamaterial to
materials with electromagnetic properties not found in
nature
Still some ambiguity as the exact definition
7. Veselago first studies the effect a negative permittivity and permeability has on
wave propagation 1968
Pendry proposes wire structures to realize a negative
permittivity1996
Pendry proposes Split Ring Resonators (SRR’s) to realize a
negative permeability
Pendry proposes another wire structures to realize a
negative permittivity
1999
2000
T
I
M
E
L
I
N
E
8. How Metamaterials Work
• Example: How to achieve negative index of refraction
• negative refraction can be achieved when both µr and εr are negative
• negative µr and εr occur in nature, but not simultaneously
• silver, gold, and aluminum display negative εr at optical frequencies
• resonant ferromagnetic systems display negative µr at resonance
rrn
1
))((
))((
2/2/
2/1
j
jj
jj
rr
e
ee
ee
9. Negative Refraction
n > 0 n > 0n < 0
Snell’s Law at the interface between a negative index material and a positive
index material:
ti nn sinsin 21
it
n
n
sinsin
2
11
Refracted beam will be opposite to the normal
as shown in the animation above.
10. Metamaterials beyond negative index
Low index metamaterials
Indefinite media
High index
metamaterials
Shrinkage of devices
Cloaking
Single-negative media
Parallel beam
formation
12. conclusion
Introduction of metamaterials in 1990’s opened new
possibilities in electromagnetics.
Successful implementation of metamaterial technology
in the microwave spectrum.
Inherent difficulties exist in fabricating optical
metamaterials
Most work to date related to modeling proposed designs
13. References:
• Smith, D. R., et al., Phys. Rev. Lett. (2000) 84, 4184
• Pendry, J. B., et al., IEEE Trans. Microw. Theory
Tech. (1999) 47, 2075
• Veselago, V. G., Sov. Phys. Usp. (1968) 10, 509
• www.google.com
• www.nanotechnology.bilkent.edu.tr/research%20areas
/documents/mm-waveleft-handed.htm
• http://en.wikipedia.org/wiki/Metamaterial