  Passive radiative cooling drawing the heat energy of objects to the cold
outer space through the atmospheric transparent window (8 um - 13 um) is
significant for reducing the energy consumption of buildings. Daytime and
nighttime radiative cooling have been extensively investigated in the past.
However, radiative cooling which can continuously regulate its cooling
temperature, like a valve, according to human need is rarely reported. In this
study, we present a concept of reconfigurable photonic structure for the
adaptive radiative cooling by continuously varying the emission spectra in the
atmospheric window region. This is realized by the deformation of the
one-dimensional PDMS grating and the nanoparticles embedded PDMS thin film when
subjected to mechanical strain. The proposed structure reaches different
stagnation temperatures under certain strains. A dynamic exchange between two
different strains results in the fluctuation of the photonic structure's
temperature around a set temperature.
