Emissivity of freestanding membranes with thin metal coatings
Emissivity of freestanding membranes with thin metal coatings
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DOI：
10.1063/1.4936851
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发表时间：
2015-12-07
影响因子：
3.2
通讯作者：
Bijkerk, F.
中科院分区：
文献类型：
--
作者：
van Zwol, P. J.;Vles, D. F.;Bijkerk, F.
厚度低至几十纳米的独立氮化硅膜可用作TEM窗口或软X射线光谱纯度滤光片。随着膜的厚度减小，发射率消失，这限制了辐射热发射和对热负荷的耐受性。我们表明，薄金属层的厚度在1纳米的顺序，提高薄膜的发射率由两个至三个数量级接近理论极限0.5。这大大增加了真空环境中膜的热负荷能力。我们的实验结果是符合经典理论，我们适应厚度依赖的散射项在德鲁德和洛伦兹振荡器。(C)2015 AIP Publishing LLC.
Freestanding silicon nitride membranes with thicknesses down to a few tens of nanometers find use as TEM windows or soft X-ray spectral purity filters. As the thickness of a membrane decreases, emissivity vanishes, which limits radiative heat emission and resistance to heat loads. We show that thin metal layers with thicknesses in the order of 1 nm enhance the emissivity of thin membranes by two to three orders of magnitude close to the theoretical limit of 0.5. This considerably increases thermal load capacity of membranes in vacuum environments. Our experimental results are in line with classical theory in which we adapt thickness dependent scattering terms in the Drude and Lorentz oscillators. (C) 2015 AIP Publishing LLC.