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

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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  1. Negative Refractive Index And Metamaterial :Current Scientific Progress and Applications -Shiv Ashish Kumar

  2. Outline • Introduction of Metamaterial and NIM. • Concepts to reality • Structure for NIM • Application Shiv Ashish Kumar

  3. 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

  4. 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

  5. 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

  6. Snell`s Law Negative Refractive index Shiv Ashish Kumar

  7. Negative refractive index • Snell`s law is still valid Shiv Ashish Kumar

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

  9. Concepts to reality D.R Smith has shown for the first time simultaneously negative Permeability and Permittivity Shiv Ashish Kumar

  10. 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

  11. Concepts to reality Till 2007, shortest Wavelength 725nm at which Shiv Ashish Kumar

  12. 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

  13. Structure for NIM Shiv Ashish Kumar

  14. Structure for NIM Shiv Ashish Kumar

  15. Negative Refractive index in optics Shiv Ashish Kumar

  16. Application Shiv Ashish Kumar

  17. Applications Cloaking Shiv Ashish Kumar

  18. Applications Watching your back !! Shiv Ashish Kumar

  19. Problems High Dissipative losses is a big problem and limits the application . We are still far from having a practical device. Shiv Ashish Kumar

  20. 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

  21. Shiv Ashish Kumar

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