Efficient treatment of dispersive electric permittivity in finite-difference time-domain simulations of advanced photonic devices

In this talk we demonstrate that when using the finite-difference time-domain simulations to study an interested photonic device, the dispersive electric permittivity of an involved medium can be modeled with the complex-conjugate pole-residue pairs very effectively. The theoretical foundation of the method is presented first, followed by a recent application example of simulating the single-molecule fluorescence enhancement by a gold bowtie nanoantenna.