Browsing by Author "Scorrano, L."
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Item Open Access Enhanced transmission through a sub-wavelength aperture: resonant approaches employing metamaterials(Institute of Physics Publishing Ltd., 2009-09-17) Bilotti, F.; Scorrano, L.; Özbay, Ekmel; Vegni, L.In this paper, we propose a number of resonant metamaterial-based approaches to enhance the power transmission through sub-wavelength apertures. The extraordinary transmission beyond the diffraction limit is usually obtained using setups that rely on covers supporting proper surface plasmon polaritons or leaky waves. However, the actual implementation in real-life applications of these structures is strongly limited by their large transverse extension. After briefly reviewing the aforementioned limitations, we present in the paper new setups based on resonant approaches, characterized by covers whose transverse dimensions are of the same order of magnitude as the aperture size. The phenomenology of the enhanced transmission, the related theoretical aspects, the results of the numerical simulations and the successful experimental verification using the newly proposed setups are then presented in detail.Item Open Access Enhanced transmission through sub-wavelength apertures by using metamaterials(World Scientific Publishing Co., 2011) Bilotti, F.; Scorrano, L.; Alici, K. B.; Aydin, K.; Cakmak, O.A.; Özbay, Ekmel; Vegni, L.In this chapter, the role of complex artificial structures in enhancing the power transmission through sub-wavelength apertures is discussed. Such devices are aimed at exciting highly localized resonances in order to increase the aperture equivalent magnetic and electric dipole moments. Some examples, based on epsilon-near-zero metamaterials (ENZ), frequency selective surfaces (FSSs) and split-ring resonators (SRRs) at microwaves, and silver nano-particle pairs at terahertz scale, are presented. Such structures may find applications in different fields, such as high-resolution spatial filters, ultra-diffractive imaging systems, high-capacity optical memories, enhanced light throughput tips for near-field scanning optical microscopes, etc. © 2011 by World Scientific Publishing Co. Pte. Ltd. All rights reserved.Item Open Access FSS-based approach for the power transmission enhancement through electrically small apertures(Springer, 2011-01-20) Scorrano, L.; Bilotti, F.; Özbay, Ekmel; Vegni, L.In this paper, a novel approach, based on the employment of frequency selective surfaces, to enhance the power transmission through sub-wavelength apertures at the microwave frequencies is presented. A heuristic interpretation of the phenomenon is given, as well as an analytical model, based on the transmission line network representation. Finally, the performance of the proposed structure is validated through a set of full-wave numerical simulations.