The local electric field enhancements around various nanoshell structures are investigated using the Finite Difference Time Domain (FDTD) method. The method provides a convenient and systematic approach for calculating several physical properties of nanostructures, including the optical absorption and scattering cross sections as well as the local electromagnetic fields. The method is applied to single uniform nanoshells as well as nanoshells with surface defects and structural distortions. The results show that, while defects can significantly affect local electric field enhancements, far field results such as extinction spectra can be remarkably insensitive to defects and distortions.
The optical properties of metallic nanoshell systems are investigated using the Finite Difference Time Domain (FDTD) method. The method provides a convenient approach for calculating several physical properties of nanoshells based structures including the optical absorption and scattering cross sections as well as the local
electromagnetic fields near the nanoshell surfaces. The method is applied to silver and gold nanoshells and nanoshell dimers. Comparisons with classical Mie scattering are presented.
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