Opto-acoustic technique to evaluate adhesion strength of thin-film systems

S. Yoshida (1) , S. Adhikari (1) , K. Gomi (2) , R. Shrestha (1) , D. Huggett (1) , C. Miyasaka (3) , I. Park (4)

1 Southeastern Louisiana University
2 Department of Mechanical Engineering, Tokio Denki University
3 Penn State - Pennsylvania State University
4 Seoul National University of Science and Technology, Seoul, Republic of Korea

An opto-acoustic technique is proposed to evaluate the adhesion strength of thin film systems at the film-substrate interface. The thin-film system to be examined is configured as an end-mirror of a Michelson interferometer, and driven from the rear with an acoustic transducer at audible frequencies. The amplitude of the resultant oscillation of the film is quantified as the variation in the contrast of the interferometric fringe pattern observed with a digital camera at 30 frames/s. As a proof of concept, experiment has been conducted with the use of a pair of strongly and weakly adhered Au-coated Si-wafer specimens. The technique successfully differentiates the adhesion strength of the specimens.

Domaines: Physique [physics]

S. Yoshida, S. Adhikari, K. Gomi, R. Shrestha, D. Huggett, et al.. Opto-acoustic technique to evaluate adhesion strength of thin-film systems. AIP Advances, 2012, 12, pp.02226-1 - 02226-7. ⟨hal-01128248⟩