Computational analysis and full-wave optimizations of nanoantenna arrays for desired scattering and radiation characteristics

We present computationally intensive analysis and optimizations of nanoantenna arrays made of dielectric or metallic elements. Scattering and radiation characteristics of the arrays are obtained by using surface integral equations that can be used for penetrable objects, including plasmonic structures. Optimizations are performed via genetic algorithms, while the required thousands of trials are performed efficiently by using the multilevel fast multipole algorithm. Numerical results involving arrays of nanocubes with removed elements for achieving maximum scattering and radiation of electromagnetic fields at desired directions demonstrate the effectiveness of the developed simulation and optimization mechanism.