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Realization of High-Q Fano Resonances in Ceramic Dielectric Metamaterials for Sensing, Cloaking, and Lossless Energy Transfer Applications
Keywords: metamaterials, ceramic resonators, Fano resonance
Recent studies of multi-resonance structures have revealed an opportunity to realize high-Q Fano Resonances and Electromagnetically Induced Transparency - the phenomena known previously to exist only in the quantum world - in macro-systems. These advances opened up new perspectives for the development of optical components, in particular, those based on plasmonic effects. However, the ways toward incorporating these unusual phenomena in microwave and mm-range techniques still have to be explored. The possibility to realize Fano resonances is based on providing interference between two wave processes that should differ by the time constant and by coupling with the passing waves. We have recently found that Fano resonances could be excited in dielectric metamaterials composed of periodic arrays of cylindrical ceramic resonators. In difference from plasmonic and photonic resonance systems, where realization of Fano resonances required complicated sets of resonators of different shapes and dimensions, ceramic arrays could be composed from identical resonators. As the result, the structure formed by ordinary ceramic resonators with relatively low Q-factor, for instance, of about 10, could be used to provide Fano resonances with Q-factor of about 3000 or 5000. The frequency of Fano resonances could be tuned at small changes of the array lattice parameter or the permittivity of the host material. High Q factor makes the component with Fano resonances extremely attractive for sensing and filtering. The other feature of Fano resonances is that they respond coherently and thus support lossless wave transfer through otherwise nontransparent material. Therefore, materials with Fano resonances can be used for filling waveguide bends to organize wave transport across these parts without phase changes. In addition, Fano resonances are accompanied by a close to zero refractive index of the medium that makes materials with Fano resonances being perspective for cloaking of arbitrary shaped objects.
Elena Semouchkina, Associate Professor
Michigan Technological University
Houghton, MI

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