Abstract
This paper presents a cost-effective method to fabricate tapered sub-wavelength structures (SWSs) on the polycarbonate (PC) film using gas-assisted hot embossing with anodic aluminum oxide (AAO) template. The AAO template with array of high-aspect-ratio submicron holes was fabricated using a two-step anodization process. The soften polymer is then pressurized by gas to fill deep into the nano-holes, tapered SWSs could be generated by directly separating the PC film from AAO template during the de-molding process. The heights were up to about 260 nm. The fabricated PC film reduces the reflectivity from 8.9% in a bare film to 2% with tapered SWSs at the wavelength of 550 nm. The AAO template can be used repeatedly.
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