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Thermal emission of localized surface phonons (LSPhs) from nanostructures ofpolaritonic materials is a promising mechanism for tuning the spectrum ofnear-field thermal radiation. Previous studies have theoretically shown thatthermal emission of LSPhs results in narrow-band peaks in the near-fieldspectra, whose spectral locations can be modulated by changing the dimensionsof the nanostructure. However, near-field thermal emission of LSPhs has notbeen experimentally explored yet. In this study, we measure the spectrum ofnear-field thermal radiation from arrays of 6H-silicon carbide (6H-SiC)nanopillars using an internal-reflection-element based spectroscopy technique.We present an experimental demonstration of thermal emission of the transversedipole, quadrupole, and octupole, as well as longitudinal monopole from 6H-SiCnanopillars at a near-field distance from the array. We show that the spectrallocation of the longitudinal monopole and transverse dipole are significantlyaffected by the near-field coupling between neighboring nanopillars as well asthe intercoupling of the nanopillars and the substrate. We also experimentallydemonstrate that the spectrum of near-field thermal radiation from 6H-SiCnanopillar arrays can be tuned by varying the dimensions of the nanopillars,providing an opportunity for designing emitters with tailored near-fieldthermal radiation.

Probing Near-Field Thermal Emission of Localized Surface Phonons from Silicon Carbide Nanopillars