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Journal of Applied Physics / Volume 102 / Issue 4 / INTERDISCIPLINARY AND GENERAL PHYSICS

J. Appl. Phys. 102, 044902 (2007); http://dx.doi.org/10.1063/1.2769141 (8 pages)

Enhanced backward wave propagation in evanescent waveguides loaded with split ring resonators

J. Carbonell1, L. J. Roglá1, V. E. Boria1, and R. Marqués2

1Instituto de Telecomunicaciones y Aplicaciones Multimedia (iTEAM), Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
2Departamento de Electrónica y Electromagnetismo, Universidad de Sevilla, Av. Reina Mercedes s/n, 41012 Sevilla, Spain

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(Received 18 January 2007; accepted 28 June 2007; published online 20 August 2007)

This paper reports on the design and experimental characterization of evanescent waveguides loaded with split ring resonators (SRRs) supporting enhanced backward wave propagation. With respect to previous negative refractive index devices based on metallic waveguides, the use of a direct coaxial probe excitation inside an evanescent waveguide drastically improves transmission and reflection characteristics of the periodic structure. Moreover, the addition of metallic windows interleaved between consecutive resonators offers an extra degree of freedom in order to control interresonator couplings, and hence, device parameters like overall transmission, reflection, and bandwidth of the backward wave pass band. A numerical and experimental analysis of different structures overcoming the high loss issue of previously published results is detailed. An experimental validation of the proposed enhancements is done for periodic structures, where no individual tuning of the resonator sections is performed. The proposed technology mainly offers the advantage of miniaturization, and it could be combined in a further step with standard design techniques to provide frequency selective devices.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. TOPOLOGIES FOR IMPROVING THE TRANSMISSION RESPONSE OF AN EVANESCENT WAVEGUIDE LOADED WITH AN SRR ARRAY
    1. Influence of a reduced height waveguide
    2. Coaxial probe excitation
    3. Inductive windows
  3. EXPERIMENTAL VALIDATION AND DISCUSSION
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

optical resonators, optical waveguides

PACS

  • 42.79.Gn

    Optical waveguides and couplers

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2769141

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    J. B. Pendry, Phys. Rev. Lett. 85, 3966 (2000).

    A. Alu and N. Engheta, Phys. Rev. E 72, 016623 (2005).

    R. Marqués, J. Martel, F. Mesa, and F. Medina, Phys. Rev. Lett. 89, 183901 (2002).

    R. Marqués, F. Medina, and R. Rafii-El-Idrissi, Phys. Rev. B 65, 144440 (2002).

    M. J. Freire, R. Marqués, F. Medina, M. A. G. Laso, and F. Martin, Appl. Phys. Lett. 85, 4439 (2004)APPLAB000085000019004439000001.


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