Abstract
In this paper, a tunable mid-infrared metasurface based on VO2 phase change material is proposed for temperature control. The proposed structure consisting of a VO2/SiO2/VO2 cavity supports a thermally switchable Fabry-Perot-like resonance mode at the transparency window of the atmosphere. Theoretically, the radiative cooling power density of the proposed metasurface can be switched to four-fold as the device temperature is below/above the phase change temperature of VO2. Besides radiative cooling, a passive temperature control application based on this huge cooling power switching ability is theoretically demonstrated. We believe the proposed device can be applied for small radiative cooling and temperature control applications.
Highlights
Plasmonic metamaterials and metasurfaces have been demonstrated for their ability to manipulate almost the entire range of properties of incident electromagnetic waves, for example, manipulating the amplitude, polarization, propagation direction, frequency and phase and so on[1]
The absorption spectrum of the designed structure shows the absorption at the transparency window of the atmosphere regime dramatically changed as the insulator phase VO2 phase changes to be a metal phase one
We believe the proposed structure can be used as a tunable radiative cooling and passive temperature control device
Summary
A tunable mid-infrared metasurface based on VO2 phase change material is proposed for temperature control. A passive temperature control application based on this huge cooling power switching ability is theoretically demonstrated. Additional energy and resources to carry heat away are not needed during the radiative cooling process Alongside these experiments, a lot of theoretical works aimed at designing various photonic and plasmonic structures for radiative cooling applications have been proposed[8,9,10,11]. The resonant frequency of a metamaterial can be thermally tuned based on VO2 phase transition[13] This means one can tune the emission peak at the transparency window of the atmosphere by tuning the geometric parameters of the metamaterial and by tuning the temperature of a phase change material. We believe the proposed structure can be used as a tunable radiative cooling and passive temperature control device
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