On the Low-Order Partial-Fraction Fitting of Dielectric Functions at Optical Wavelengths
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Low-order partial-fraction (PF) fitting of optical dielectric functions from tabulated frequency data is investigated. Two rational function identification techniques are examined, viz., the Sanathanan-Koerner iteration and vector fitting, and it is found that these methods generate PF models of similar quality and both provide excellent starting solutions for further improvement by nonlinear optimizers. High-quality, wide-band PF models are obtained for several metals frequently encountered in plasmonic applications. These models are stable and well-suited for the finite-difference time-domain (FDTD) simulation of light interaction with nanostructures. An efficient FDTD updating scheme for PF media is also demonstrated. 2013 IEEE.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
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