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Super black and ultrathin amorphous carbon film inspired by anti-reflection architecture in butterfly wing
- Zhao, Qibin, Fan, Tongxiang, Ding, Jian, Zhang, Di, Guo, Qixin, Kamada, Masao
- Carbon 2011 v.49 no.3 pp. 877-883
- absorption, biomimetics, butterflies, carbon, reflectance, refractive index, wings
- An ultrathin and super black amorphous carbon (a-C) film has been fabricated by borrowing the inverse V-type anti-reflection nano-architecture from the black wings of butterfly Ornithoptera goliath through vacuum sintering process. The biomimetic a-C film shows good optical absorption (99%) at low reflectance (<1%) in visible light (380–795nm), which is comparable to the previously fabricated darkest materials, while with a thickness (5μm) of only 15% of those materials. Experimental results as well as theoretical simulation which is based on finite difference time domain method (FDTD) show that reflection of the fabricated inverse V-type structured a-C film is merely 1/13 of that of the flat surface a-C film, and 1/8 of that of glassy carbon. Complex refractive index of the derived a-C for visible light (380–795nm) has also been calculated.