The Ohio State University

Abstract:
As portable devices are increasingly developed and used, the size of their displays are getting smaller, therefore becoming harder to view. Integrated micro‐projectors are an alternative way to see a big image on any surface chosen by users. Microprojectors require red, blue, and green lasers to perform. However, unfortunately the green laser is not commercially available. In order to generate the green laser, frequency doubling technique is used, doubling a semiconductor laser of a wavelength 1060nm to 530nm green laser. The best alignment of the lenses in frequency doubling technique effects on energy efficiency and performance of the devices. To align the lenses, there are reciprocating and stick‐slip motions between the components in the devices. Therefore, nanotribological studies of adaptive optics sliding components with a lubricant in microprojectors are needed. In this study, a methodology to measure lubricant thickness and distribution is developed. Lubricant bonding techniques are identified to bond the lubricant to the surfaces with thermal, UV or plasma treatments. Friction, adhesion and wear mechanisms of lubricant on the sliding components are studied in various environments, such as different humidity and temperature.

Bio:
Dr. Hyungoo Lee is a senior scientist at Nanoprobe Laboratory for Bio‐ & Nanotechnology and Biomimetics (NLBB) in the Department of Mechanical Engineering, Ohio State University. He received his B.S. in Electrical Engineering from University of Seoul, South Korea, and his Ph.D. from Mechanical Engineering from Texas A&M University in 2009. His current research focuses on lubricants in micro/nano devices to understand nanotribological phenomena, and finally improve friction, adhesion, and wear.

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