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Sökning: WFRF:(Asenov Tatjana)

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1.
  • Dalarsson, Mariana, et al. (författare)
  • Arbitrary Loss Factors In The Wave Propagation Between RHM And LHM Media With Constant Impedance Throughout The Structure
  • 2013
  • Ingår i: Progress In Electromagnetics Research. - 1070-4698 .- 1559-8985. ; 137, s. 527-538
  • Tidskriftsartikel (refereegranskat)abstract
    • We investigate the wave propagation properties in lossy structures with graded permittivity and permeability involving left-handed metamaterials. An exact analytic solution to Helmholtz' equation for a lossy case with both real and imaginary parts of permittivity and permeability profile, changing according to a hyperbolic tangent function along the direction of propagation, is obtained. It allows for different loss factors in RHM and LHM media. Thereafter, the corresponding numerical solution for the field intensity along the composite structure is obtained by means of a dispersive numerical model of lossy metamaterials that uses a transmission line matrix method based on Z-transforms. We present the expressions and graphical results for the field intensity along the composite structure and compare the analytic and numerical solutions, showing that there is an excellent agreement between them.
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2.
  • Dalarsson, Mariana, et al. (författare)
  • Exact analytical solution for fields in gradient index metamaterials with different loss factors in negative and positive refractive index segments
  • 2013
  • Ingår i: Journal of Nanophotonics. - 1934-2608. ; 7, s. 073086-
  • Tidskriftsartikel (refereegranskat)abstract
    • Gradient refractive index metamaterials are of interest for various applications of transformation optics. Wave propagation through gradient index metamaterials using an exact analytical approach is investigated. Composite materials containing constituents with negative real and positive real indexes of refraction are considered. An exact analytical solution for the field distribution is obtained for the sinusoidal spatial variation of complex effective permittivity and permeability along a fixed direction, under the assumption that the wave impedance remains spatially uniform across the structure. Loss factors in the constituent materials can be different from each other corresponding to the realistic situations. Temporal dispersion can be arbitrary subject to the physical limitations imposed by the Kramers-Kronig relations. A numerical model based on the Z-transform is developed to verify the analytical results. The approach can be applied to arbitrary periodic refractive index profiles using the Fourier series method.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
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refereegranskat (2)
Författare/redaktör
Dalarsson, Mariana (2)
Norgren, Martin (2)
Asenov, Tatjana (2)
Doncov, Nebojsa (2)
Jaksic, Zoran (1)
Lärosäte
Kungliga Tekniska Högskolan (2)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
Teknik (1)
År
2013 (2)

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