@article{HesmerTatartschukZhuromskyyetal., author = {Hesmer, Frank and Tatartschuk, Eugen and Zhuromskyy, Oleksandr and Radkovskaya, Anna A. and Shamonin (Chamonine), Mikhail and Hao, Tong and Stevens, Chris J. and Faulkner, Grahame and Edwards, David J. and Shamonina, Ekaterina}, title = {Coupling mechanisms for split ring resonators: Theory and experiment}, series = {Physica status solidi b}, volume = {244}, journal = {Physica status solidi b}, number = {4}, publisher = {Wiley}, doi = {10.1002/pssb.200674501}, pages = {1170 -- 1175}, abstract = {We study experimentally and theoretically coupling mechanisms between metamaterial elements of the split ring resonator (SRR) type. We show that, depending on the orientation of the elements relative to each other, the coupling may be either of magnetic or electric type or a combination of both. Experimental results on SRRs with resonances around 1.7-1.9 GHz agree quantitatively with results of simulations (CST Microwave Studio). Further simulations provide analysis for a variety of SRRs both in the GHz and in the 20 THz frequency regions. The variety of coupling mechanisms can be employed in designing near field manipulating devices based on propagation of slow waves.}, language = {en} } @article{SydorukRadkovskayaZhuromskyyetal., author = {Sydoruk, O. and Radkovskaya, Anna A. and Zhuromskyy, Oleksandr and Shamonina, Ekaterina and Shamonin (Chamonine), Mikhail and Stevens, Chris J. and Faulkner, Grahame and Edwards, David J. and Solymar, L.}, title = {Tailoring the near-field guiding properties of magnetic metamaterials with two resonant elements per unit cell}, series = {PHYSICAL REVIEW B}, volume = {73}, journal = {PHYSICAL REVIEW B}, number = {22}, publisher = {APS}, doi = {10.1103/PhysRevB.73.224406}, abstract = {A theoretical and experimental study of magnetic metamaterials with unit cells containing two resonant elements is presented. The properties of these structures, consisting of split rings, are governed by strongly anisotropic magnetic coupling between individual elements. This coupling leads to propagation of slow magnetoinductive waves in the vicinity of the resonant frequency. The wavelength of magnetoinductive waves is much smaller than the free-space wavelength of the electromagnetic radiation. This opens up the possibility of manipulating the near field on a subwavelength scale. We develop a theoretical formulation for coupled chains of metamaterial elements allowing the tailoring of their guiding properties in the near field. In a comprehensive analysis modes of coupled waveguides supporting forward and/or backward waves are identified and the corresponding hybridization mechanisms for dispersion equations of magnetoinductive waves are determined. Analytical predictions are verified both experimentally and numerically on a variety of coupled waveguides. The approach can be employed for the design of near-field manipulating devices.}, language = {en} } @article{RadkovskayaShamoninChamonineStevensetal., author = {Radkovskaya, Anna A. and Shamonin (Chamonine), Mikhail and Stevens, Chris J. and Faulkner, Grahame and Edwards, David J. and Shamonina, Ekaterina and Solymar, L.}, title = {An experimental study of the properties of magnetoinductive waves in the presence of retardation}, series = {Journal of Magnetism and Magnetic Materials}, volume = {300}, journal = {Journal of Magnetism and Magnetic Materials}, number = {1}, publisher = {Elsevier}, doi = {10.1103/physrevb.73.224406}, pages = {29 -- 32}, abstract = {Magnetoinductive (MI) waves owe their existence to the magnetic coupling between metamaterial elements. First experiments confirming the existence of MI waves were carried out on capacitively loaded loops and Swiss Rolls about three orders of magnitude smaller than the operating wavelengths (5-15 m) so that the radiation effects did not play any significant role. In the present paper MI waves are studied experimentally on various types of split ring resonators of about 1 cm diameter operating in the microwave region between 1 and 2 GHz. Our results prove that retardation has a significant effect upon the propagation of MI waves.}, language = {en} } @article{RadkovskayaShamoninChamonineStevensetal., author = {Radkovskaya, Anna A. and Shamonin (Chamonine), Mikhail and Stevens, Chris J. and Faulkner, Grahame and Edwards, David J. and Shamonina, Ekaterina and Solymar, L.}, title = {Resonant frequencies of a combination of split rings: Experimental, analytical and numerical study}, series = {Microwave and Optical Technoly Letters}, volume = {46}, journal = {Microwave and Optical Technoly Letters}, number = {5}, publisher = {Wiley}, doi = {10.1002/mop.21021}, pages = {473 -- 476}, abstract = {The resonant frequencies of five different ring resonators are measured with the aid of a network analyser within the frequency range of about 1.5 to 2.8 GHz. The resonant frequencies for those configurations are also determined from numerical calculations using the commercially available MICRO-STRIPES package. The experimental and numerical results are shown to be very close to each other. Analytical results from various authors, available for three of the configurations, are also compared with the experimental results; one of them leads to a large discrepancy, but the other analytical approximations are shown to be not too far off.}, language = {en} }