Electromagnetic funneling through a single-negative slab paired with a double-positive transformation slab

Giuseppe Castaldi; Vincenzo Galdi; Andrea Alù; Nader Engheta

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Electromagnetic funneling through a single-negative slab paired with a double-positive transformation slab

Giuseppe Castaldi ^[1] ; Vincenzo Galdi ^[1] ; Andrea Alù ^[2] ; Nader Engheta ^[3]
1. [1] University of Sannio
  
  University of Sannio
  
  Benevento, Italia
2. [2] University of Texas at Austin
  
  University of Texas at Austin
  
  Estados Unidos
3. [3] University of Pennsylvania
  
  University of Pennsylvania
  
  City of Philadelphia, Estados Unidos
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Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 32, Nº 6, 2013, págs. 1821-1833
Idioma: inglés
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Resumen
- Purpose – The work is aimed at studying the electromagnetic interaction between a homogeneous, isotropic single-negative (SNG) slab and an inhomogeneous, anisotropic double-positive (DPS) slab.
  
  Design/methodology/approach – The approach is based on the transformation optics framework, which allows systematic design and modelling of anisotropic, inhomogeneous metamaterials with inherent field-manipulation capabilities.
  
  Findings – The paper finds that a transformation-optics-based DPS slab can compensate the inherent opaqueness to the electromagnetic radiation of a SNG slab. Here, “compensation” means that the resulting bi-layer may give rise to zero-reflection for a normally-incident plane wave at a given frequency. Such phenomenon is inherently accompanied by (de)funneling effects for collimated-beam illumination, and it turns out to be quite robust to material losses as well as geometrical and constitutive-parameter truncation.
  
  Originality/value – The results provide further evidence and insight in how SNG-like responses may be emulated (within narrow parametric ranges) by suitably-engineered spatial inhomogeneity and anisotropy in DPS media. Moreover, they also show that resonant transmission phenomena through SNG materials may be engineered via the powerful framework of transformation optics.