Thermal management broadband emitting device based on VO2 applied in the mid infrared band

Abstract

Mid infrared thermal radiation has attracted attention due to its wide range of applications. Compared to the static process of thermal emission, the dynamic control of it is more suitable for practical applications. Based on phase change materials, this article designs a controllable thermal emitter. When the temperature changes from low to high, VO2 transitions from a dielectric state to a metallic state, and its imaginary part of dielectric constant significantly increases, leading to differences in emission characteristics. At low temperatures, the device is in a low dielectric state and has weak resonance with incident light. The main emission comes from the bottom of the grating structure, with an emissivity of 0.21. At high temperatures, the structure is in a high dielectric state, and multiple resonance modes are excited within the structure, such as cavity resonance and surface plasmon resonance, which increases the emissivity to 0.95 and achieves effective heat dissipation. To sum up, by utilizing the phase change material VO2, this structure possesses thermal management capability and thermal stability, and has broad application prospects.