Verification of a metamaterial with gradient particles and its near-field radiative heat transfer property

Near-field radiative heat transfer (NFRHT) between electronic components has become an important factor in the development of high-performance optoelectronic devices. Here, a metamaterial containing graded particles is proposed and measured. Two NFRHT peaks are excited by the local surface plasmon mode and surface plasmon mode. The results show that the filling factor and gradient factor have important effects on the NFRHT properties of the metamaterial. These measurement results provide the experimental basis for the application of gradient metamaterials in optoelectronic devices.