Metamaterials
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Metamaterial is an arrangement of artificial structural elements, designed to achieve advantageous and unusual electromagnetic properties meta = beyond (Greek)
![L.I. Mandelshtam described negative refraction and
backward propagation of waves in his textbook published
in 1944.[7]
Left handed materials , characterized by negative effective
value of refractive index. These materials were theoretically
predicted in 1967 by Veselago [7]
Pendry group, In 1999, they open the door to design
Metamaterial by there design array of split ring resonator
and mesh wire.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Metamaterials
- 1. Khalid Saeed Lateef Al Badri
- 2. L.I. Mandelshtam described negative refraction and backward propagation of waves in his textbook published in 1944.[7] Left handed materials , characterized by negative effective value of refractive index. These materials were theoretically predicted in 1967 by Veselago [7] Pendry group, In 1999, they open the door to design Metamaterial by there design array of split ring resonator and mesh wire.
- 3. The electromagnetic response of a material is defined by its electromagnetic properties: permittivity and
- 5. Normal water = 1.7, = 1 NIM water* = -1.3, = -1.3 *Gunnar Dolling, et. al., Opt. Exp.14, 1842 (2006)Perfect Lens (Pendry, 2000) Light deflection n > 0 n < 0 Light focusing Metamaterials: artificially engineered materials possessing electro-magnetic properties that do not exist in naturally occurring materials.
- 6. •Left-hand media •Media with negative refraction index •Backward-wave media •Double-negative (DNG) metamaterials
- 9. In naturally exiting substances permittivity and permiability are positve (except the cases of noble metals like gold silver etc where permitivitty is negative for certain range of frequency). 0 0 Now lets consider that : ( )( )effn n
- 10. • So we see that a negative refractive index can be obtained in principle if both permittivity and permeability are negative simultaneously. • This makes the left hand material. • Why we want negative refractive index
- 14. • The famous SRR(split ring resonator suggested by Sir Pendry) • First Realized by D.R Smith group in 2001.
- 15. • Motivation: metallic behavior at GHz frequencies • Problem: the dielectric response is negatively (close to) infinite • Solution: “dilute” the metal 2 2 a r nn eneff m ene p 0 2 2 eff eff effp m en 0 2 2 ,
- 16. • Periodicity or inclusions much smaller than wavelength • 2+1D or 1+2D (dimensions of variations) • Effective dielectric response determined by filling fraction f
- 17. λa