High-temperature resistive surface grating for spectral control of thermal radiation
Abstract
Spectral emittance and thermal stability of two-dimensional W gratings are investigated to obtain high-temperature resistive selective emitters. Numerical calculations based on rigorous coupled-wave analysis are performed to determine the structural profile of gratings with good spectral selectivity. According to the determined parameters, two-dimensional W gratings composed of rectangular microcavities with the period of 1.0 μm are fabricated on single crystalline and polycrystalline W substrates. The grating shows a strong emission peak which can be explained by the confined modes inside the cavities. The grating with 200 nm wall thickness made from a single crystalline W shows very high thermal stability over 1400 K, while the polycrystalline grating is deformed at a high temperature because of the grain growth.
- Publication:
-
Applied Physics Letters
- Pub Date:
- March 2003
- DOI:
- 10.1063/1.1560867
- Bibcode:
- 2003ApPhL..82.1685S
- Keywords:
-
- 42.79.Dj;
- 44.40.+a;
- Gratings;
- Thermal radiation