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The infrared normal spectral emissivity of microstructured silicon prepared by femtosecond laser irradiation in SF 6 was measured for the wavelength range 2.5μm to 25μm. Greatly enhanced emissivity compared to that of flat silicon was observed over the entire wavelength range. For a sample with 13–14μm high spikes, the emissivity at a temperature of 100°C is approximately 0.96. The emissivity...
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