Durable infrared optical coatings based on pulsed DC-sputtering of hydrogenated amorphous carbon (a-C:H)

Gibson, D. et al. (2020) Durable infrared optical coatings based on pulsed DC-sputtering of hydrogenated amorphous carbon (a-C:H). Applied Optics, 59(9), pp. 2731-2738. (doi: 10.1364/AO.378266)

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Abstract

Optical properties of low-temperature pulsed DC-sputter deposited (≤70°C) hydrogenated carbon are presented. Increasing hydrogen incorporation into the sputter deposited carbon significantly decreases infrared optical absorption due to a decrease in deep absorptive states associated with dangling bonds. Hydrogen flow is optimized (hydrogen flow 3 sccm), achieving the best compromise between increased infrared transmittance and hardness for durable coating performance. Optical, environmental, and durability performance of pulsed DC-sputtered carbon incorporated in multilayer (a-C:H/Ge) infrared antireflective coatings indicates suitability as a durable infrared optical coating for commonly used infrared substrates, including temperature sensitive chalcogenide glass.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sproules, Dr Stephen and Gibson, Professor Des
Authors: Gibson, D., Song, S., Fleming, L., Ahmadzadeh, S., Chu, H. O., Sproules, S., Swindell, R., Zhang, X., Navabpour, P., Clark, C., and Bailey, M.
College/School:College of Science and Engineering > School of Chemistry
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Applied Optics
Publisher:Optical Society of America
ISSN:1559-128X
ISSN (Online):2155-3165
Published Online:03 February 2020
Copyright Holders:Copyright © 2020 Optical Society of America
First Published:First published in Applied Optics 59(9): 2731-2738
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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