Passive thermal radiation control based on thermochromic W-doped VO2 metasurfaces

Radiative cooling becomes a popular research topic targeting an energy efficient solution for thermal management. Vanadium dioxide (VO2), as a thermochromic material, is able to switch optical property between dielectric and metallic states depending on its temperature. We present a passive thermal management solution through a VO2 based metasurface. Through a novel ALD process, the fabricated VO2 metasurface on polyimide substratehas a room-temperature transition and a high infrared emissivity of ~0.4

Metal oxide meta-optical solar reflectors for space applications

Optical solar reflectors (OSRs) play a crucial role in the spacecraft thermal management. We present novel OSRs based on planar or non-planar metal oxide metasurface. Fabricated meta-OSRs are shown to give superior emittance performance

Smart meta-optical solar reflectors based on vanadium dioxide

Optical solar reflectors (OSRs) play a crucial role in the thermal control of a spacecraft. We present novel ’smart’ metasurface-based OSRs using vanadium dioxide (VO2), which has its infrared emittance modulated by temperature. We have investigated the infrared property of the ALD VO2 films under different anneal conditions and found the anneal condition can optimize VO2 infrared response. We have demonstrated that a superior emittance tunability and lower solar absorption for meta-OSRs than the planar film device