Numerical and experimental study on the optical performance of micro-pyramid functional surfaces
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TECHNICAL PAPER
Numerical and experimental study on the optical performance of micro-pyramid functional surfaces Haitao Wang1 • Wei Chen1 • Wei Zhao1 • Huiming Wu1 Received: 6 August 2020 / Accepted: 10 October 2020 Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Micro-pyramid functional surfaces are currently widely used in various advanced scientific, technological, industrial, and engineering fields with their excellent performances of compactness, light weight and higher heat transfer performance. Many recent studies have introduced micro cutting as a method to achieve high-quality micro pyramid surfaces. This paper concerns a micro-pyramid with a height and slope of 60 lm and 30. Firstly, numerical simulation of the optical effect related to micro-pyramid surfaces was carried out to reveal the mechanism of functional surface imaging and its typical and potential applications. The simulated optical effect shows that the micro-pyramid can form four virtual images on the same side of an object. Next, a novel and simple fabrication method for micro-pyramidal structures was developed by using cross cutting with a 120 V-tip diamond tool by ultra-precision raster milling (UPRM), which can obtain good surface quality, high form accuracy and efficient productivity in contrast to grinding, laser machining and etching. Finally, precision injection molding was employed to replicate a micro-pyramid on the PMMA for optical testing. Although the quality of molded micro pyramid pattern decreased, optical testing showed that clear images were obtained, and the experimental results were consistent with the simulation results.
1 Introduction In the last few decades, micro-structured surfaces have been widely used in scientific research and modern industry for the possibility of many predominant performances in optics, biology, etc. (Zhang et al. 2019; Wang et al. 2015). For example, the cooling performance of the heater surface can be significantly improved by micropyramid structure surface (Sodtke and Stephan 2007). In order to improve the superhydrophobicity of the Si surface, the effects of micro-pyramid and nanoneedle structures were investigated (Lee et al. 2016). A micro-pyramid as a reflective structure has outstanding reflective performance (theoretically up to 66.7%), and has therefore been broadly applied in many aspects of our lives such as flexible displays, e-paper, greenhouse temperature control, warning signs, and so on (Wu et al. 2017; Li et al. 2016). Micro-structured functional surfaces are very different in size, orientation and distribution to control their & Haitao Wang [email protected] 1
School of Mechanical and Electrical Engineering, Shenzhen Polytechnic, Shenzhen 518055, China
functions (Zhang et al. 2019). Currently, many manufacturing methods have been developed to achieve these functional micron-sized structured surfaces. They are mainly divided into three categories: material addition, material migration, and material re
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