The research of relationships between residual stress and columnar angles in oblique deposition of magnesium fluoride thin films

Cheng-Chung Jaing; Ming-Chung Liu; Wen-Hao Cho; Chien-Jen Tang; Yeuh-Yeong Liou; Jun-Yuan Wang; Cheng-Chung Lee

doi:10.1117/12.892380

21 September 2011 The research of relationships between residual stress and columnar angles in oblique deposition of magnesium fluoride thin films

Cheng-Chung Jaing, Ming-Chung Liu, Wen-Hao Cho, Chien-Jen Tang, Yeuh-Yeong Liou, Jun-Yuan Wang, Cheng-Chung Lee

Author Affiliations +

Proceedings Volume 8128, Current Developments in Lens Design and Optical Engineering XII; and Advances in Thin Film Coatings VII; 81280K (2011) https://doi.org/10.1117/12.892380
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

MgF₂ films are obliquely deposited on glass substrates using a resistive heating Mo boat at both substrate temperatures of room temperature and 220 °C. These films have obviously columnar microstructures from SEM pictures without respect to substrate temperatures. The columnar angles of the MgF₂ films increase with the deposition angles. However, the columnar angle of MgF₂ film, deposited at a substrate temperature of room temperature, is not equal to that at 220 °C when the MgF₂ films are prepared at the same deposition angle. Also, the trend of stress behavior of the MgF₂ films, deposited at a substrate temperature of room temperature, is different from that at 220 °C due to the generation of thermal stress. The behaviors associated with stress in the MgF₂ films are measured using a phase-shifting Twyman-Green interferometer with the application of a phase reduction algorithm. Anisotropic stress does not develop in the MgF2 films with tilted columns and the residual stress depends on the deposition and columnar angles in columnar microstructures of the MgF₂ films.

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Cheng-Chung Jaing, Ming-Chung Liu, Wen-Hao Cho, Chien-Jen Tang, Yeuh-Yeong Liou, Jun-Yuan Wang, and Cheng-Chung Lee "The research of relationships between residual stress and columnar angles in oblique deposition of magnesium fluoride thin films", Proc. SPIE 8128, Current Developments in Lens Design and Optical Engineering XII; and Advances in Thin Film Coatings VII, 81280K (21 September 2011); https://doi.org/10.1117/12.892380

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