Near-field radiative heat transfer (NFRHT), primarily caused by evanescent wave tunneling in the near-field region, between a doped silicon metasurface (${\mathrm{M}}_{\mathrm{Si}}$) and a ${\mathrm{Si}\mathrm{O}}_2$ slab was investigated, employing rigorous coupled-wave analysis (RCWA) with the scattering matrix formalism. It was found that NFRHT is significantly enhanced in the frequency bands, owing to the hybrid modes coexcited by the surface plasmon polaritons of the ${\mathrm{M}}_{\mathrm{Si}}$ and the surface phonon polaritons of ${\mathrm{Si}\mathrm{O}}_2$. A transient all-optical method was proposed for NFRHT, based on focused ion beam (FIB) deposition, to measure the heat flux between patterned surfaces. It was experimentally demonstrated that, in a small near-field region, such as 100 nm, compared with RCWA, the effective medium theory (EMT) exhibits large deviations and cannot explain the physical mechanism of NFRHT well in artificial structures of a micrometer-scale period. In addition, the NFRHT mechanism was clarified by comparing the patterned ${\mathrm{M}}_{\mathrm{Si}}$ and unpatterned ${\mathrm{Si}\mathrm{O}}_2$, paving the way for the physical research and applications of NFRHT.

Close

PrevNext

View figure in article

• Heat transfer
• Near-field optics
• Photonics
• Plasmonics
• Dielectrics
• Metasurfaces
• Photonic crystals
• Thermal photovoltaics