title: Control and Manipulation of Nano Cracks Mimicking Optical Wave.
abstract: Generally, a fracture is considered as an uncontrollable thus useless phenomenon due to its highly random nature. The aim of this study is to investigate highly ordered cracks such as oscillatory cracks and to manipulate via elaborate control of mechanical properties of the cracking medium including thickness, geometry, and elastic mismatch. Specific thin film with micro-sized notches was fabricated on a silicon based substrate in order to controllably generate self-propagating cracks in large area. Interestingly, various nano-cracks behaved similar to optical wave including refraction, total internal reflection and evanescent wave. This novel phenomena of controlled cracking was used to fabricate sophisticated nano/micro patterns in large area which cannot be obtained even with conventional nanofabrication methods. We also have showed that the cracks are directly implementable into a nano/micro-channel application since the cracks naturally have a form of channel-like shape.
authors.affiliation: Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea (R.O.K).
authors.forename: Young D
authors.initials: YD
authors.lastname: Suh
authors.affiliation: Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea (R.O.K).|Department of Mechanical Engineering, University of California, Berkeley, CA 94720-1740, USA.
authors.forename: Junyeob
authors.initials: J
authors.lastname: Yeo
authors.affiliation: Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea (R.O.K).
authors.forename: Habeom
authors.initials: H
authors.lastname: Lee
authors.affiliation: Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea (R.O.K).
authors.forename: Sukjoon
authors.initials: S
authors.lastname: Hong
authors.affiliation: Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea (R.O.K).
authors.forename: Jinhyeong
authors.initials: J
authors.lastname: Kwon
authors.affiliation: Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea (R.O.K).
authors.forename: Kyunkyu
authors.initials: K
authors.lastname: Kim
authors.affiliation: Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea (R.O.K).
authors.forename: Seung Hwan
authors.initials: SH
authors.lastname: Ko