Spectral control of thermal radiation emitted from micro-cavities made on a mirror-like-polished Ni metal surface was investigated through numerical simulation and experiment. In simulation, thermal radiation from solid surface was dealt as hemispherical emission from point sources, and Maxwell’s equations were solved using CIP (Cubic Interpolated Propagation) method. It was demonstrated that the emittance could be increased around the wavelength corresponding to the standard mode of cavity resonance, while the emittance at wavelengths corresponding to the higher modes was much the same as that of smooth flat surface. Furthermore, in experiment using rectangular micro-cavities (0.5×0.5×0.5μm3) made periodically on Ni smooth surface, spectral emittance was measured in the near-infrared region. The experimental results disclosed that the emissive power only in the range of shorter wavelength than 1.2μm was increased by the micro-cavities that played a role of a wave guide to produce cutoff effect clearly.

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