Metamaterial one-dimensional periodic
structures are composed of split-ring resonators, which can display electric permittivity and magnetic permeability simultaneously negative, are studied experimentally. In the present study, each
resonator is made up of two concentric circular copper rings patterned on a substrate of kapton, with slits diametrically opposite
each other and with the line of the splits along the longitudinal direction of the periodic array containing seven split rings evenly spaced. The
experiments consist in inserting the metamaterial slab into a square waveguide
of side length 6 mm,
corresponding to a cutoff frequency of 25 GHz. Transmission bands due to
magnetic and electrical responses are identified for slits with
aperture widths of 1 mm and 2 mm, centered at 5.67 and 6.12 GHz
frequencies, respectively, values well below the 25 GHz frequency cutoff, so
characterizing a medium with negative permeability and
J. J. Barroso, P. J. Castro and J. P. Leite Neto, “Experiments on Wave Propagation at 6.0 GHz in a Left-Handed Waveguide,” Microwave and Optical Technology Letters, Vol. 52, No. 10, 2010, pp. 2175-2178.
R. Marqués, J. Martel, F. Mesa and F. Medina, “Left-Handed-Media Simulation and Transmission of EM Waves in Subwavelength Split-Ring-Resonator-Loaded Metallic Waveguides”, Physical Review Letters, Vol. 89, No. 18, 2002, pp. 183901-183904.
H. O. Moser, B. D. F. Case, O. Wilhelm and B. T. Saw, “Terahertz Response of a Microfabricated Rod-Split-Split-Ring-Resonator Electromagnetic Material,” Physical Review Letters, Vol. 94, No. 6, 2005, pp. 063901063904. doi:10.1103/PhysRevLett.94.063901
J. B. Pendry, A. J. Holden, D. J. Robbins and W. J. Stewart, “Magnetism from Conductors and Enhanced Nonlinear Phenomena,” IEEE Transactions on Microwave Theory and Tecnique, Vol. 47, No. 11, 1999, pp. 2075-2084.
E. Ozbay, K. Guven and K. Aydin, “Metamaterials with Negative Permeability and Negative Refractive Index: Experiments and Simulations,” Journal of Optics A: Pure and Applied Optics, Vol. 9, No. 9, 2007, pp. S301-S307.
D. R. Smith, W. J. Padilla, D. C. Vier, S. C. Nemat-Nasser and S. Schultz, “Composite Medium with Simultaneously Negative Permeability and Permittivity,” Physical Review Letters, Vol. 84, No. 18, 2000, pp. 4184-4187.
K. Aydin, I. Bulu, K. Guven, M. Kafesaki, C. M. Soukoulis and E. Ozbay. “Investigation of Magnetic Resonances for Different Split-Ring Resonators Parameters and Designs,” New Journal of Physics, Vol. 7, No. 168, 2005, pp. 1-15. doi:10.1088/1367-2630/7/1/168
N. Katsarakis, T. Koschny, M. Kafesaki, E. N. Economou and C. M. Soukoulis, “Electric Coupling to the Magnetic Resonance of Split Ring Resonators,” Applied Physics Letters, Vol. 84, No. 15, 2004, pp. 2943-2945.
K. Aydin, K. Guven, M. Kafesaki, L. Zhang, C. Soukoulis, E. Ozbay, “Experimental Observation of True Left-Handed Transmission Peaks in Metamaterials,” Optics Letters, Vol. 29, No. 22, 2004, pp. 2623-2625.
J. J. Barroso, P. J. Castro and J. P. Leite Neto, “Microwave Propagation Experiments on a Waveguide Loaded by an Array of Split-Ring Resonators,” Proceedings of SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, Natal, 29 October-1 November 2011, pp. 527-532. doi:10.1109/IMOC.2011.6169326