Plasmonics

, Volume 9, Issue 6, pp 1257–1263 | Cite as

Optical Propagation Through Graded-Index Metamaterials in the Presence of Gain

Article

Abstract

We present a comparative theoretical study of electromagnetic wave propagation through randomly structured isotropic and stratified anisotropic active metamaterial slabs, whose refractive indices vary smoothly from positive values on one end of the slabs to negative values on the other. The chief advantage of our two configurations over recent hypothetical structures is that they can be made from real materials using common fabrication techniques. We find that even a small excess of gain (loss) in the randomly structured slab can result in a strong resonant amplification (absorption) of incident field on the length scale of an optical wavelength. This collective effect—somewhat similar to Landau amplification (damping) in a collisionless plasma—may prove useful in making compact optical amplifiers and perfect light absorbers.

Keywords

Metamaterials Electromagnetic optics Subwavelength structures Effective medium theory All-optical devices 

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Monash UniversityMelbourneAustralia
  2. 2.ITMO UniversitySaint PetersburgRussia

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