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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 12 — Jun. 11, 2007
  • pp: 7720–7729

Towards -1 effective index with one-dimensional metal-dielectric metamaterial: a quantitative analysis of the role of absorption losses

Jinlong Zhang, Haitao Jiang, Boris Gralak, Stefan Enoch, Gérard Tayeb, and Michel Lequime  »View Author Affiliations


Optics Express, Vol. 15, Issue 12, pp. 7720-7729 (2007)
http://dx.doi.org/10.1364/OE.15.007720


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Abstract

We propose a theoretical study of the optimization of one dimensional metal-dielectric metamaterials in order to approach -1 effective optical index. Taking into account actual values of dielectric constants of metal (silver) and dielectrics (HfO2, GaP), and taking advantage of the dispersion relation of Bloch modes, we get a silver/HfO2 metamaterial with suitable parameters that possesses a near −1 effective optical index for all angles of incidence at a visible wavelength for H-polarized light (i.e. the magnetic field is parallel to the interfaces). The absorption losses of materials appear to be a crucial factor that affects the effective properties of the metamaterial. We show that the losses not only decrease the transmission of the stack, but also change the negative refraction effect. Then, we propose another silver/GaP structure design that is less sensitive to losses. When considering finite thickness structures, and with adequate thickness for the terminating layers, it is possible to achieve a high transmittance of the structure. A near −1 effective index and high transmittance metal-dielectric metamaterial may pave the way to the realization of negative refraction in the visible or ultraviolet wavelength range.

© 2007 Optical Society of America

OCIS Codes
(260.2110) Physical optics : Electromagnetic optics
(310.6860) Thin films : Thin films, optical properties

ToC Category:
Metamaterials

History
Original Manuscript: April 20, 2007
Revised Manuscript: May 18, 2007
Manuscript Accepted: May 28, 2007
Published: June 7, 2007

Citation
Jinlong Zhang, Haitao Jiang, Boris Gralak, Stefan Enoch, Gérard Tayeb, and Michel Lequime, "Towards -1 effective index with one-dimensional metal-dielectric metamaterial: a quantitative analysis of the role of absorption losses," Opt. Express 15, 7720-7729 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-12-7720


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