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Negative Refractive I ndex A nd Metamaterial :Current S cientific P rogress and Applications. -Shiv Ashish Kumar. Outline. Introduction of Metamaterial and NIM. Concepts to reality Structure for NIM Application. Metamaterial. Meta means Beyond in greek

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Negative Refractive I ndex A nd Metamaterial :Current S cientific P rogress and Applications


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negative refractive i ndex a nd metamaterial current s cientific p rogress and applications

Negative Refractive Index And Metamaterial :Current Scientific Progress and Applications

-Shiv Ashish Kumar

outline
Outline
  • Introduction of Metamaterial and NIM.
  • Concepts to reality
  • Structure for NIM
  • Application

Shiv Ashish Kumar

metamaterial
Metamaterial
  • Meta means Beyond in greek
  • Meta material literally means beyond conventional material.
  • They are typically man made material .
  • Having a properties not found in nature.

Shiv Ashish Kumar

negative refractive index
Negativerefractive index

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).

Nowletsconsiderthat:

Shiv Ashish Kumar

negative refractive index5
Negativerefractive index
  • 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 ??

Shiv Ashish Kumar

snell s law
Snell`s Law

Negative Refractive index

Shiv Ashish Kumar

negative refractive index7
Negative refractive index
  • Snell`s law is still valid

Shiv Ashish Kumar

concept
Concept
  • The first theoritical study was performed by V.G VESELAGO and
  • it took nearly 30 years for experimental verification.

Shiv Ashish Kumar

concepts to reality
Concepts to reality

D.R Smith has shown for the first time simultaneously negative Permeability and Permittivity

Shiv Ashish Kumar

concepts to reality10
Concepts to reality

Sir J.B Pendry has given the concept of

perfect lens using negative refractive index.

This is one of the great break though work in the world of meta material.

Shiv Ashish Kumar

concepts to reality11
Concepts to reality

Till 2007, shortest Wavelength 725nm at which

Shiv Ashish Kumar

different structures used for designing nim
Different structures used for designingNIM.
  • The famous SRR(split ring resonator suggested by Sir Pendry)
  • First Realized by D.R Smith group in 2001.

Shiv Ashish Kumar

structure for nim
Structure for NIM

Shiv Ashish Kumar

structure for nim14
Structure for NIM

Shiv Ashish Kumar

application
Application

Shiv Ashish Kumar

applications
Applications

Cloaking

Shiv Ashish Kumar

applications18
Applications

Watching your back !!

Shiv Ashish Kumar

problems
Problems

High Dissipative losses is a big problem and limits the application .

We are still far from having a practical device.

Shiv Ashish Kumar

the famous people in the world of meta material
The famous people in the world of meta material
  • V.G Veselago
  • Sir John Brian Pendry , imperial college ,London.
  • Professor David R. Smith ,Duke University
  • Vladimir M. Shalaev , Perdue university.
  • Xiang Zhang , University of California ,Berkeley.

Shiv Ashish Kumar