Fig. 3: Optical properties of the nanophotonic structure.
From: Continuously variable emission for mechanical deformation induced radiative cooling
a Spectral emissivity of the reconfigurable nanophotonic structure at the original state (the blue solid curve) and under a maximum strain of 120% (the black solid curve) displayed with the normalized ASTM G173 solar spectrum (AM 1.5, the green shading area), the infrared atmospheric transparent window (the blue shading area) and the normalized blackbody spectrum (the red solid curve) at 300 K. b The overall solar reflectivity Rsolar and emissivity εIR of the proposed structure embedded with only a single species of SiC, Si3N4, or BN and the three mixed nanoparticles. The nanophotonic structure’s solar reflectivity Rsolar(θ) (c) and emissivity εIR (θ) (d) across various angle of incident (AOI) result in high hemispherical solar reflectivity Rsolar and emissivity εIR at original state (“ON” mode). The high solar reflectivity Rsolar(θ) (e), and the low emissivity εIR (θ) (f) across angles shows the “OFF” mode with a low hemispherical emissivity εIR under 120% strain.
