Spectral control of thermal emission by periodic microstructured surfaces in the near-infrared region
- 1 July 2001
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America A
- Vol. 18 (7), 1471-1476
- https://doi.org/10.1364/josaa.18.001471
Abstract
Thermal emissive properties of microstructured surfaces are measured in the near-infrared region. Two-dimensional periodic microstructured surfaces with metal coatings are fabricated with Si anisotropic etching and laser ablation techniques. The structural periods of the samples are 2.0 and 1.5 μm. Clear selective-emission bands are observed experimentally. This selective emission is attributed to the resonance effect between the emissive field and the surface microstructures. In addition, numerical calculation computed with rigorous coupled-wave analysis (RCWA) is performed on the microstructured samples. The selective-emission peaks measured through experiments can be reproduced well by RCWA, and this result suggests strongly that the thermal radiation from periodic structures may have spatial coherence. It is confirmed that the surface microstructure can be applied to the control of spectral emission from high-temperature materials.Keywords
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