Byeong-Hee Kim

A Study on Manufacturing Method of Nano-Micro Hybrid Pattern Using Indentation Machining Method and AAO Process

Micro/nano patterns for optical concentration and diffusion have been studied in the various fields such as displays, optics, and sensors. Conventional micro patterns were continuous and linear shapes due to using linear-type light sources, however, recently non-continuous patterns have been applied as point sources are used for dot-type light sources such as LEDs and OLEDs. In this study, a hybrid machining technology combining an indentation machining method and an AAO process was developed for manufacturing the non-continuous micro patterns having nano patterns. First, mirror-like surfaces (R a <20nm) of pure Aluminum substrates were obtained by optimizing cutting conditions. Then, The letter of ‘K’ consisting of the arrays of the micro patterns was manufactured by the indentation machining method which has a similar principle to indentation hardness testing. Finally, nano patterns were machined by AAO process on the micro patterns. Conclusively, a specific letter having nano-micro hybrid patterns was manufactured in this study.

Straightening Process of Micro Wires

This paper deals with the effect of the direct heating method(DHM) for straightening the micro wire. Straightened micro wires have been widely used in the fields of the medicine and the semi-conductor. We have developed a micro wire straightening system by using the direct wire heating method. To controling the tension of the micro wire during the heating and straightening process, a precision tension sensor was set up. In order to avoid the surface oxidation during the heating process, the argon inert gas was supplied to the vicinity of the wire. And, this paper shows the correlation between the tension and the current when arson gas supplied to the tungsten wire. Through several experiments, the optimal tension and current were found. Also, higher straightness and roundness

Micro/nano patterning characteristics in hot embossing process

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Chemical-assisted ultrasonic machining of glass

The hot embossing process has been known as one of major nano replication techniques. This is due to its simple process, low cost, high replication fidelity and relatively high throughput. As the initial step of quantitating the hot embossing process, simple parametric studies for the embossing time have been carried out using high‐resolution masters which patterned by DRIE process and laser machining. Under different embossing times, the viscous flow of thin PMMA films into micro cavities under the compression force has been investigated. Also, the viscous flow during the embossing process was simulated by the continuum based FDM analysis considering micro/nano effect, such as surface tension and contact angle.