Rainbow Trapping and Releasing in InSb Graded Grating Strip at the Terahert: Range

In this paper, we demonstrate the feasibility of exciting surface plasmon polaritons (SPPs) using intrinsic indium antimonide (InSb) graded grating structure, which exhibits extraordinary properties of trapping and releasing electromagnetic waves in terahertz range. The dispersive properties of the gradient-corrugate InSb grating structure is characterized using the computer simulation technology (CST). Furthermore, the propagation characteristics of the InSb grating grooves are thorough analyzed by the dispersive relation curves, electron field magnitude distribution. It is proved that the graded grating grooves based on intrinsic InSb are capable of exciting SPPs. The electric field magnitude distributions of the grating waveguide in fixed frequency at different temperatures are compared, which demonstrates the InSb grating structure is an excellent candidate for trapping and releasing SPPs at terahertz (THz). The thermo-optic property of InSb gives rise to the meaningful application for future compact communication devices.