Effective-medium properties of a free-space transmission-line metamaterial superlens

This work discusses the validity of the effective-medium interpretation of the multilayer negative-refractive-index transmission-line (NRI-TL) metamaterial superlens using supporting simulation and experimental data. The uniqueness of its extracted effective permittivity and permeability is verified through a comparison of simulation data for lenses of different thicknesses, and simulations of negative refraction for various angles of incidence illustrate that an effective-medium perspective is justified. Experimental results for subdiffraction imaging are corroborated by the theory governing the relationship between loss, resolution, and bandwidth.

[1]  George V. Eleftheriades,et al.  Mechanisms of subdiffraction free-space imaging using a transmission-line metamaterial superlens: An experimental verification , 2008 .

[2]  G. Eleftheriades,et al.  A Multilayer Negative-Refractive-Index Transmission-Line (NRI-TL) Metamaterial Free-Space Lens at X-Band , 2007, IEEE Transactions on Antennas and Propagation.

[3]  Sergei A. Tretyakov,et al.  Local constitutive parameters of metamaterials from an effective-medium perspective , 2007 .

[4]  R. Gonzalo,et al.  On the definition of effective permittivity and permeability for thin composite layers , 2007, physics/0703119.

[5]  G. Eleftheriades,et al.  Volumetric layered transmission-line metamaterial exhibiting a negative refractive index , 2006 .

[6]  A. Grbic,et al.  Practical limitations of subwavelength resolution using negative-refractive-index transmission-line lenses , 2005, IEEE Transactions on Antennas and Propagation.

[7]  M. Rosenbluth,et al.  Limitations on subdiffraction imaging with a negative refractive index slab , 2002, cond-mat/0206568.

[8]  D. Smith,et al.  Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients , 2001, physics/0111203.

[9]  J. Pendry,et al.  Negative refraction makes a perfect lens , 2000, Physical review letters.

[10]  V. Veselago.  The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ , 1968 .

[11]  Steve C. Cripps.  Metamaterialism , 2006, IEEE Microwave Magazine.

[12]  E. Wolf,et al.  Principles of Optics (7th Ed) , 1999 .