Regulation of Thermal Radiation Characteristics in Isotope Batteries Based on Fishnet Metamaterials

With the deepening of deep space exploration, traditional photovoltaic cells are difficult to satisfy the needs of day and night alternation and deep space exploration. The development of isotope battery is becoming increasingly important. In this paper, a fishnet metamaterial is applied in the isotope battery to regulate the radiant energy of the heat source, achieving high transmission in the near-infrared bands, and high reflection in the far-infrared band. The radiation process with spectral regulation is simulated by FLUENT commercial software. The results indicate that the temperature distribution of the isotope battery can be effectively changed by the spectral regulation of the fishnet metamaterial. The regulated radiant energy can increase the temperature of the heat source and reduce the temperature of the infrared photovoltaic cell. The results of this paper can provide potential application in the field of military and aerospace.