B13-117 SPECTRAL CONTROL OF THERMAL RADIATION BY TWO-DIMENSIONAL SURFACE GRATING STRUCTURES

概要

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Spectral control of thermal radiation has been investigated for high efficiency energy conversion systems. This technique has been applied for selective emitters of thermophotovoltaic (TPV) power generation systems. In this study, the spectral absorptance and emittance of W surface gratings with short periodicity corresponding to the VIS to NIR wavelengths has been investigated to develop spectrally selective devices. Numerical calculations based on rigorous coupled-wave analysis have been performed to evaluate the grating parameters. Two kinds of W surface gratings composed by microcavities have been fabricated by fast atom beam etching with two different lithography techniques. These gratings have shown strong absorption of emission due to the surface microstructures in the VIS to NIR region, whereas their reflectance in the IR region is kept at a high level. Their high thermal stability is confirmed from heating tests under vacuum or reduced atmospheres. Physical aspect of the interaction of electromagnetic wave with lossy gratings has been also discussed briefly.
一般社団法人日本機械学会の論文
2003-11-30