Germanium window with highly durable diamond-like carbon coating for infrared camera of automobile

Jung H. In; Min W. Seo; Haeng Y. Jung; Seon H. Kim; Ju H. Choi

doi:10.1117/12.2529690

9 September 2019 Germanium window with highly durable diamond-like carbon coating for infrared camera of automobile

Jung H. In, Min W. Seo, Haeng Y. Jung, Seon H. Kim, Ju H. Choi

Proceedings Volume 11129, Infrared Sensors, Devices, and Applications IX; 111290H (2019) https://doi.org/10.1117/12.2529690
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

A diamond-like carbon thin film was deposited on the outer face of the germanium (Ge) window to protect the infrared lenses from a harsh environment in automotive application. Infrared transmittance and residual stress of a tetrahedral amorphous carbon (ta-C) thin film by a filtered cathodic vacuum arc (FCVA) source were investigated to increase the lifetime of a Ge window. They were found to have a trade-off relation about the change of the substrate pulse voltage. By introducing methane gas in FCVA deposition process, a hydrogenated ta-C (ta-C:H) thin film of which both IR transmittance and residual stress was improved could be obtained. A Ge window coated with ta-C:H thin film with 1.43 μm thickness showed anti-reflective effect in long-wave infrared. The hardness of ta-C:H thin film on Ge window was higher than 30 GPa. Adhesion, severe abrasion, temperature, humidity and salt solubility tests were carried out in accordance with MIL-C-48497A.

Conference Presentation

Citation Download Citation

Jung H. In, Min W. Seo, Haeng Y. Jung, Seon H. Kim, and Ju H. Choi "Germanium window with highly durable diamond-like carbon coating for infrared camera of automobile", Proc. SPIE 11129, Infrared Sensors, Devices, and Applications IX, 111290H (9 September 2019); https://doi.org/10.1117/12.2529690

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