Study of Multi-Bent-Section Nano-Antenna Structures Using the Parallelized Finite-Difference Time-Domain Method

The finite-dierence time-domain(FDTD)method has been widely used in computational electromagnetics. We construct aparallelized three-dimensional(3-D) FDTD simulator in C++ language and several computers are connected to speed-up the computations by using the message passing interface(MPI) protocol in order to reduce the simulationtime. In this research, the Multi-Bent-Section Nano-Antennas (MBSNAs) and arrays of four dierent structures are numerically studied. The single Multi-Bent-Section Nano-Antennas are first investigated by applying a broadband normally incident plane wave to obtain responses in the wavelength range from 0.3 um to 4.0 um. The electriceld enhancement in the gap of antenna and corresponding resonant wavelengths are calculated and the influence of dierent varied antenna arm widths on the enhancement spectrum is studied. Then the corresponding four different arrays are investigated and compared with the single antennas.The enhancement spectra of the arrays are found to depend critically on the array period lengths and are examined in detail. For antennas with more sections or longer arms, wide-band characteristic in the long wavelength regime is observed.