Journal
ACS PHOTONICS
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.2c01310
Keywords
near-field thermal radiation; silicon carbide nanopillars; localized surface phonons; spectral tuning; thermal near-field spectroscopy
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In this study, we experimentally demonstrate the thermal emission of transverse and longitudinal modes from 6H-SiC nanopillars in near-field distance. We show that the spectral locations of these modes can be greatly influenced by the near-field coupling between neighboring nanopillars and the intercoupling of the nanopillars and the substrate. Moreover, we find that the spectrum of near-field thermal radiation from the nanopillar arrays can be tuned by varying the dimensions of the nanopillars, enabling the design of emitters with tailored near-field thermal radiation.
Thermal emission of localized surface phonons (LSPhs) from nanostructures of polaritonic materials is a promising mechanism for tuning the spectrum of near-field thermal radiation. Previous studies have theoretically shown that thermal emission of LSPhs results in narrow-band peaks in the near-field spectra, whose spectral locations can be modulated by changing the dimensions of the nanostructure. However, near-field thermal emission of LSPhs has not been experimentally explored yet. In this study, we measure the spectrum of near-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 transverse dipole, quadrupole, and octupole as well as longitudinal monopole from 6H-SiC nanopillars at a near-field distance from the array. We show that the spectral locations of the longitudinal monopole and transverse dipole are significantly affected by the near-field coupling between neighboring nanopillars as well as the intercoupling of the nanopillars and the substrate. We also experimentally demonstrate that the spectrum of near-field thermal radiation from 6H-SiC nanopillar arrays can be tuned by varying the dimensions of the nanopillars, providing an opportunity for designing emitters with tailored near-field thermal radiation.
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