41 research outputs found
Analysis and design of directional couplers based on metal-insulator-metal (MIM) plasmonic waveguide
No full textMetal-Insulator-Metal (MIM) plasmonic waveguide based directional couplers operating at telecom wavelengths
No full textThe study and analysis of two types of 2D plasmonic directional couplers based on the Metal-Insulator-Metal (MIM) waveguide operating at 1.55 μm are presented in this paper. We make use of transmission-line theory for the design and optimization of a branch-line coupler and a rat-race coupler. © 2013 IEEE
A study on the fundamental mode characteristics sustained by the plasmonic slot waveguide
No full textHierarchical in silico validation procedure for biomass estimation techniques based on dielectric spectroscopy
No full textAbstract In order to obtain an accurate estimation of the biomass as a function of the permittivity of the suspension, a simple in silico hierarchical procedure is proposed. The procedure is designed to perform the homogenization from the micro-scale to the macro-scale exploiting very simple analytical models and simulation setups under the hypothesis of diluted suspension (biomass less than 0.2). Results obtained show that it is possible to overcome some difficulties concerning the analytical treatment of the cellular shape by considering a sphere with the same dielectric behavior in the quantitative analysis of the biomass. The entire study is based on simulations performed in order to verify the correctness of the procedure. Obtained data are used in a biomass estimation scenario to show the efficacy of the procedure
Multicarrier digital fractional fourier transform for coherent optical communications
No full textA new coherent optical transmission system is proposed that makes use of the digital multicarrier fractional Fourier transform to obtain serial optical Nyquist pulses at the receiver side in the time domain by adopting the time-lens effect. Theoretical time-lens effect is derived based on fractional Fourier transform (FrFT) and chromatic dispersion effect. A fundamental study to explore the limits of the proposed system is performed and detailed results have been presented. System performance evaluation confirms reduced complexity at the receiver side
Single layer cylindrical frequency selective structures for radome applications
No full textAn analysis method is proposed for Cylindrical Frequency Selective Surfaces (CFSS), at microwave wavelength, particularly useful for antenna radome applications. The structures are made by conducting rectangular patches or slots, conformed to a cylindrical surface. Appropriate relations are employed to analyze, in particular, structures with many elements. The opacity or transparency of the surfaces for a suitable frequency range in terms of transmission/reflection coefficients is computed. Comparisons with previous results given in the literature and with data obtained through Electromagnetic Simulators have been performed
Numerical Study of the Electromagnetic Scattering by a Biological Cell Nucleus during the Different Major Phases of Mitosis
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