Tuning of the thermal radiation spectrum in the near-infrared region by metallic surface microstructures
Tuning of the thermal radiation spectrum in the near-infrared region by metallic surface microstructures
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DOI：
10.1088/0960-1317/15/9/s12
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发表时间：
2005-09-01
影响因子：
2.3
通讯作者：
Yugami, H
中科院分区：
文献类型：
--
作者：
Sai, H;Kanamori, Y;Yugami, H
本文综述了近年来从金属表面微结构的热辐射来开发热光伏发电的选择性辐射体的研究进展。数值模拟表明，金属光栅的发射率光谱出现两个不同的峰。一种是由表面等离子体激元产生的，它与光栅周期和角度有关。另一个峰是由光栅表面每个微腔产生的微腔效应来解释的。随着光栅的加深，微腔效应成为主导，并显示出适合用于热光伏发电的选择性辐射体的特性：在可见光和近红外区域具有高发射率，并且与角度无关。我们研制了两种周期为1.0 ~ 2.0 μ m的基于Si和W的二维金属光栅，由矩形微腔组成的W光栅在近红外区域显示出较高的发射率，与计算结果一致。实验证实了W选择辐射体在大功率、高效率的热光伏系统中具有优势。
This paper reviews our recent research on thermal radiation from metallic surface microstructures to develop selective radiators for thermophotovoltaic generation. Numerical simulation showed that two different peaks appeared on the emissivity spectra of metallic gratings. One was originated from surface plasmon polaritons, which was dependent on the grating period and angle. The other peak was explained by the microcavity effect which arose from each microcavity on a grating surface. The microcavity effect became dominant with deepening gratings, and showed suitable properties for selective radiators in thermophotovoltaic generation: a high emissivity within the visible and near-infrared regions, and angle independence. We developed two kinds of two-dimensional metallic gratings based on Si and W with the period of 1.0-2.0 mu m. The W gratings composed of rectangular microcavities displayed a high emissivity in the near-infrared region as expected from the calculation results. It was confirmed experimentally that the W selective radiators have advantages for high-power and high-efficiency thermophotovoltaic systems.