研究目的
Investigating the near-field radiative heat transfer between dissimilar materials mediated by coupled surface phonon- and plasmon-polaritons.
研究成果
The study successfully demonstrated the modulation of NFRHT via surface polariton coupling between dissimilar materials. The SiC-Si sample showed a more pronounced monochromatic behavior with a resonant flux significantly larger than the Si-Si sample, indicating the potential for controlling NFRHT in applications such as photonic thermal rectification and near-field thermophotovoltaics.
研究不足
The study is limited by the spectral mismatch of SiC and Si light lines, and SPhP and SPP resonances, which affects the near-field enhancement. The vacuum gap spacing of 150 nm, while small, may still not be optimal for maximizing NFRHT effects.
1：Experimental Design and Method Selection:
The experiment involved measuring NFRHT between millimeter-size surfaces made of 6H-SiC and doped Si, separated by a 150-nm-thick vacuum gap spacing maintained via SiO2 nanopillars. The methodology included fluctuational electrodynamics predictions and blackbody comparisons.
2：Sample Selection and Data Sources:
The samples consisted of a high-temperature emitter and a low-temperature receiver, both characterized by surface areas of 5 × 5 mm2. The emitter was made of a 315-μm-thick 6H-SiC substrate, and the receiver was made of Si with boron doping of ~ 4.6 × 1019 cm-
3：The emitter was made of a 315-μm-thick 6H-SiC substrate, and the receiver was made of Si with boron doping of ~ 6 × 1019 cm-List of Experimental Equipment and Materials:
3.
3. List of Experimental Equipment and Materials: The setup included thermoelectric modules for maintaining temperature differences, a heat flux meter for measuring the heat rate, and thermistors for temperature measurements. The vacuum gap spacing was characterized using a Tencor P-20H profilometer.
4：Experimental Procedures and Operational Workflow:
The temperature difference between the emitter and receiver was maintained via two thermoelectric modules. The total heat rate flowing in the sample was measured, including NFRHT and conduction heat transfer through the SiO2 nanopillars.
5：Data Analysis Methods:
The radiative flux was analyzed in transverse magnetic (TM) and transverse electric (TE) polarizations per unit angular frequency and per unit parallel wavevector. The contributions of propagating, frustrated, and surface polariton modes to the total radiative flux were calculated.
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