Algorithm of Micro-Grooving and Imaging Processing for the Generation of High-Resolution Structural Color Images
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ORIGINAL ARTICLE
Algorithm of Micro‑Grooving and Imaging Processing for the Generation of High‑Resolution Structural Color Images Tianfeng Zhou1 · Yupeng He1 · Tianxing Wang1 · Xiaobin Dong1 · Peng Liu1 · Wenxiang Zhao1 · Yao Hu2 · Jiwang Yan3 Received: 14 March 2020 / Revised: 9 June 2020 / Accepted: 23 June 2020 © International Society for Nanomanufacturing and Tianjin University and Springer Nature Singapore Pte Ltd. 2020
Abstract The use of submicron structures for structural coloration of surfaces has broad applications for color filters, projection displays, virtual reality, and anti-counterfeiting. Currently, structural color images lack high resolution due to low manufacturing accuracy. In this study, the axial-feed fly cutting (AFC) method is proposed to fabricate submicron grooves for the diffraction of visible light to create structural color images. We establish the relationship between the color information in the pixels of the original image and the parameters of the array units corresponding to the pixels. An algorithm to determine groove spacing and the tool path is established, and array units with the desired groove spacing are machined to reproduce the structural color images. The submicron grooves fabricated by AFC have high quality and good consistency. Due to the excellent diffraction performance of the machined grooves, images with high saturation and resolution can be reproduced. It is verified that images with various colors can be efficiently fabricated using the proposed method and algorithm. Keywords Submicron structure · Microgroove · Structural coloration · Structural-color image · Fly cutting · Micromachining
1 Introduction Structural coloration has the advantages of high brightness, no fading, and no pollution, and the method has a range of applications for color filters, displays, virtual reality, and anti-counterfeiting [1–4]. Structural coloration is not caused by chemical pigments but instead by complex interactions between visible light and the workpiece surface. The photonic mechanisms underlying structural coloration include the plasma effect, as well as diffraction, scattering, and interference [4, 5]. Diffraction-grating-induced structural * Tianfeng Zhou [email protected] 1
Key Laboratory of Fundamental Science for Advanced Machining, Beijing Institute of Technology, Beijing 100081, China
2
Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, Beijing Institute of Technology, Beijing 100081, China
3
Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, Yokohama 223‑8522, Japan
coloration is a method to generate high-resolution structural color images by manufacturing submicron structures and provides a pronounced iridescent effect [6–8], causing apparent changes in the color at different viewing angles. Submicron structure manufacturing requires high efficiency and high quality. Lithography is a traditional method for grating manufacturing and is highly efficient but limited by the
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