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(Color online) (a) Schematic of the pristine AAO film and the carbon-coated one. (b) AAO film thickness estimated from the curve (inset) recorded during the anodic oxidation as a function of time. Alternatively, the thickness can be calculated from the interference spectra and the refractive indices in Fig. 4(b) according to Eq. (1). The calculated values are plotted together with the result from the curve, indicating a good agreement between these two different calculation methods.
(Color) (a) UV-vis diffuse reflectance spectra of the pristine AAO films (the upper two patterns) and the carbon-coated AAO films. The film thickness of each sample is indicated. (b) A photograph of the pristine patterned AAO film (left) and its carbon-coated one (right). The pattern consists of three partly overlapped circles. The surface of each circle was separately subjected to the anodic oxidation for a different period (32, 57, or ) so that the part where the three circles are overlapped has the longest oxidation period .
(Color online) UV-vis diffuse reflectance spectra of the carbon-coated AAO films with seven different thicknesses. The films show interference colors varying from blue to red. The AAO film thickness varies from .
(Color online) (a) UV-vis diffuse reflectance spectra of the carbon-coated AAO film (the anodic oxidation: ) and those subjected to the oxygen plasma treatment for various accumulated times . The indicated number corresponds to the order of interference. (b) Dependence of the refractive index on wavelength for the original carbon-coated AAO film and the oxygen plasma-treated ones.
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