The main goal of this paper is to present thorough investigations for the metallic nanoshelled structures with rigorous
electromagnetic analysis. Two metallic nanoshelled structures are investigated; namely, single nano-shelled cylinder, and
nano-shelled photonic crystals. A rigorous Maxwell's equations solver is used to get insights into the optical properties of
the structures. Our numerical simulations show that it is difficult to shift the plasmon resonance to long wavelength (e.g.
towards ten micrometers) in such a structure. Flat bands are found in the metallic nanoshelled photonic crystals when the
lattice constants are much smaller than the operating wavelength. This would become interesting especially for realizing
ultra-compact slow wave structures such as plasmonic devices with low group velocity. Several applications using
nano-shelled particles as sensors, as substrates for surface enhanced Raman spectroscopy are also discussed in the paper.
A Model-Based Parameter Estimation (MBPE) technique is described to accelerate numerical simulations of
electromagnetic structures. The adaptive MBPE algorithm is based on Cauchy's formula and operates in the frequency
domain to extrapolate or interpolate from a narrowband set of data to a broadband set of data. The data can be either
computed or measured over a specified frequency range. For computed data the sampled values of the function and a few
low order derivatives are calculated from a Maxwell solver and are then used to reconstruct the function. For measured
data, only measured values of the parameter set are used to create broadband information. In this case derivatives are
avoided as they are too noisy. Adaptive MBPE belongs to the class of auxiliary techniques and can be added to any field
solver. In this paper the technique is combined with two semi-analytic field solvers working in the frequency domain, the
Method of Auxiliary Sources (MAS) and the Multiple Multipole Program (MMP). A dielectric waveguide, metallic and
metallo-dielectric Photonic Crystals (PhCs) as well as Channel Plasmon-Polariton (CPP) structures are analyzed to
demonstrate the efficiency of adaptive MBPE.
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