Abstract: Spectral and directional control of infrared radiation based on excitation of confined electromagnetic resonant modes opens up a viable way for design and study of new semiconductor materials, electromagnetic and thermal analysis of micro/nano scale electronics. In this paper, we present numerical simulation results of the thermal radiative properties of a silicon carbide (SiC) thermal emitter/absorber. We illustrate different electromagnetic resonant modes which can be excited with the structure and the process of radiation spectrum optimization based on a non-linear optimization algorithm. The results show that the spectral and directional control of thermal emission/absorption can be efficiently achieved by adjusting the geometrical parameters of the structure.