Spidell Matthew T, Conklin Davis R, Yung Christopher S, Theocharous Evangelos, Lehman John H
Appl Opt. 2019 Jan 10;58(2):257-263. doi: 10.1364/AO.58.000257.
We demonstrate improved manufacturability of spectrally flat detectors for visible to mid-infrared wavelengths by characterizing a carbon nanotube spray coating compatible with lithium tantalate and other thermal sensors. Compared against previous spray coatings, it demonstrated the highest responsivity yet attained due to both higher absorptivity and thermal diffusivity, while also being matured to a commercially available product. It demonstrated spectral nonuniformity from 300 nm to 12 μm less than 1% with uncertainty (k=2) under 0.4%. The spatial nonuniformity of the assembled sensor was less than 0.5% over the central half (4 mm) of the absorber. As with previous developments employing isotropic carbon nanotube coatings, the absorber surface was sufficiently robust to withstand cleaning by compressed air blast and survived repeated vacuum cycling without measurable impact upon responsivity.
通过对与钽酸锂和其他热传感器兼容的碳纳米管喷涂涂层进行表征，我们展示了用于可见光到中红外波长的光谱平坦探测器的可制造性得到了改善。与之前的喷涂涂层相比，由于更高的吸收率和热扩散率，它展现出了迄今所达到的最高响应度，同时也已成熟为一种商业产品。在0.4%的不确定度（k=2）下，它在300纳米至12微米的光谱不均匀性小于1%。组装好的传感器在吸收体中心一半（4毫米）区域的空间不均匀性小于0.5%。与之前采用各向同性碳纳米管涂层的研发情况一样，吸收体表面足够坚固，能够承受压缩空气喷射清洁，并且在反复的真空循环中幸存下来，对响应度没有可测量的影响。
