Absorption and scattering in perfect thermal radiation absorber-emitter metasurfaces
Absorption and scattering in perfect thermal radiation absorber-emitter metasurfaces
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DOI：
10.1364/oe.447885
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发表时间：
2022-01-31
期刊：
影响因子：
3.8
通讯作者：
Juodkazis, Saulius
中科院分区：
文献类型：
--
作者：
Nishijima, Yoshiaki;To, Naoki;Juodkazis, Saulius
通过时域有限差分（FDTD）光子学模拟，对超颖表面的辐射吸收和散射行为进行了详细的光谱分析。结果表明，对于典型的金属-绝缘体-金属（MIM）纳米盘超颖表面，吸收和散射截面在吸收峰光谱位置处表现出σ（abs）/σ（sca）= 1的比率。同样发现这种关系限制了实验和应用环境中可获得的光热转换效率。通过增加由于光学材料（例如通常用作粘附层的Cr金属纳米膜）引起的吸收，可以控制总吸收效率eta = sigma（abs）/sigma（sca）并使其成为主要的消光机制。这指导了MIM超颖表面的设计，这些超颖表面被定制为近乎完美的热辐射吸收和发射。我们提出的制造以及数值和实验光谱表征的光学表面。(c)2022 Optica出版集团根据Optica开放获取出版协议的条款
Detailed spectral analysis of radiation absorption and scattering behaviors of metasurfaces was carried out via finite-difference time-domain (FDTD) photonic simulations. It revealed that, for typical metal-insulator-metal (MIM) nanodisc metasurfaces, absorbance and scattering cross-sections exhibit a ratio of sigma(abs)/sigma(sca) = 1 at the absorption peak spectral position. This relationship was likewise found to limit the attainable photo-thermal conversion efficiency in experimental and application contexts. By increasing the absorption due to optical materials, such as Cr metal nano-films typically used as an adhesion layer, it is possible to control the total absorption efficiency eta = sigma(abs)/sigma(sca) and to make it the dominant extinction mechanism. This guided the design of MIM metasurfaces tailored for near-perfect-absorption and emission of thermal radiation. We present the fabrication as well as the numerical and experimental spectral characterisation of such optical surfaces. (c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement