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An ultra-compact blackbody using electrophoretic deposited carbon nanotube films
RSC Advances ( IF 3.9 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1039/c7ra12113j
Albert Lin,Chien-Chih Yang,Parag Parashar,Chien-Yung Lin,Ding Rung Jian,Wei-Ming Huang,Yi-Wen Huang,Sze Ming Fu,Yan Kai Zhong,Tseung Yuen Tseng

Carbon nanotubes (CNTs) possesses decent optical properties and thus can be considered as a candidate for perfect absorbers due to their close-to-air refractive index and minimal extinction. However, weak absorption in porous materials, due to the low extinction coefficients, requires an inevitably thick absorption layer (∼100 μm) for the perfect opaque absorbers. Thus, the requirement of large thicknesses of CNTs prohibits them from being used as miniaturized integrated photonic devices. Here, we propose an electrophoretic deposited (EPD) CNT resonant cavity structure on tantalum (Ta) to enhance optical absorption. Efficient random light scattering along with the resonant cavity structure using Ti/SiO2 stacking enhances the absorption in our proposed EPD-CNT film while maintaining the total device thickness to <1 μm. The experiment results reveal that the absorption band covers the entire UV-VIS-NIR spectrum (λ = 0.3–2.6 μm), using resonant-cavity EPD-CNT design. The EPD deposition process is done at relatively low temperature < 120 °C. We believe that this proposal is very promising for sensing, antenna, and thermophotovoltaics (TPV), in terms of bandwidth, compactness and cost.

中文翻译:

使用电泳沉积碳纳米管薄膜的超致密黑体

碳纳米管 (CNTs) 具有良好的光学特性,因此由于其接近空气的折射率和最小的消光,可以被认为是完美吸收体的候选者。然而,由于消光系数低,多孔材料中的弱吸收需要一个不可避免的厚吸收层(~100 μm)才能形成完美的不透明吸收体。因此,对大厚度 CNT 的要求阻碍了它们用作小型化集成光子器件。在这里,我们提出了一种在钽 (Ta) 上电泳沉积 (EPD) CNT 谐振腔结构以增强光吸收。高效的随机光散射以及使用 Ti/SiO 2的谐振腔结构堆叠增强了我们提出的EPD-CNT薄膜的吸收,同时将总器件厚度保持在<1μm。实验结果表明,采用共振腔 EPD-CNT 设计,吸收带覆盖了整个 UV-VIS-NIR 光谱( λ = 0.3–2.6 μm)。EPD 沉积过程是在 < 120 °C 的相对低温下完成的。我们认为,就带宽、紧凑性和成本而言,该提议对于传感、天线和热光伏 (TPV) 非常有前景。
更新日期:2018-01-17
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