Frequency-Dependent FDTD Analyses of Terahertz Plasmonic Devices

摘要

The properties of surface plasmon polaritons (SPPs) have recently been utilized even at terahertz (THz) frequencies. In this article, the frequency-dependent finite-difference time-domain (FDTD) method is applied to the analysis of terahertz plasmonic devices. We first mention the modeling of an InSb material that can support SPPs and present the FDTD equation based on the simple trapezoidal recursive convolution (TRC) technique. Next, the TRC-FDTD method is applied to investigating a waveguide-based TM-pass polarizer with InSb layers. Numerical results show that an extinction ratio of 30 dB is obtained with a device length of less than 500 µm.