Periodic trapezoidal VO2 -Ge multilayer absorber for dynamic radiative cooling

Optics Express
Wen-Wen ZhangJing-Wen Shi

Abstract

Nowadays, the requirement for achieving dynamic radiative cooling is more and more intense, so a cooling system is proposed and developed to meet the demand in this paper. This cooling system is composed of a filter and a periodic trapezoidal VO2-Ge multilayer absorber (VGMA). The filter on the top enables the VGMA to reflect most of the solar irradiation at daytime and the absorptance or emittance of the VGMA is very different in the spectrum band of 8-13 μm for insulating and metallic VO2 due to the phase transition characteristic of VO2. With this cooling system, close-to-zero absorptance in the range of 0.3-2.5 μm and high (low) absorptance from 8 to 13 μm are achieved for metallic (insulating) VO2. Based on changing the temperature and absorptivity or emissivity simultaneously, radiative heat can be transferred dynamically to the outer space. When VO2 is in the insulating phase, the absorption mechanism of the absorber is magnetic resonance and surface plasmon polariton resonance, and broadband high absorptivity is achieved by exciting slowlight waveguide mode at broadband wavelengths when VO2 is in metallic phase. The spectral absorptance characteristics of the absorber in the two phase states are investigated as a functi...Continue Reading

References

Apr 2, 2010·ACS Applied Materials & Interfaces·Chetan N Suryawanshi, Chhiu-Tsu Lin
Feb 9, 2012·Nano Letters·Yanxia CuiNicholas X Fang
Mar 14, 2018·Optics Express·Huixu DengXiaodong Yang
May 18, 2018·Scientific Reports·Sheng-Rui WuChih-Ming Wang
Sep 7, 2018·Optics Express·Masashi OnoShanhui Fan

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