Copper-based etalon filter using antioxidant graphene layer

Copper is a low-cost material compared to silver and gold, having high reflectivity in the near infrared spectral range as well as good electrical and thermal conductivity. Its properties make it a good candidate for metal-based low-cost multilayer thin-film devices and optical components. However,...

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Bibliographic Details
Published in:Nanotechnology 2020-10, Vol.31 (44), p.445206-445206
Main Authors: Nam, Kiin, Lee, Youjin, Kim, SeongYeon, Kim, Sunghwan, Hong, Sung Ju, Choi, Wonjong, Lee, Jinhee, Kim, Hyelin, Kim, Dai-Sik, Kim, JunHo, Choi, Soobong, Bahk, Young-Mi
Format: Article
Language:English
Subjects:
copper
etalon
graphene
optical filter
oxidation
thin film
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Summary:Copper is a low-cost material compared to silver and gold, having high reflectivity in the near infrared spectral range as well as good electrical and thermal conductivity. Its properties make it a good candidate for metal-based low-cost multilayer thin-film devices and optical components. However, its high reflectance in the devices is reduced because copper is easily oxidized. Here, we suggest a copper-based Fabry-Perot optical filter consisting of a thin dielectric layer stacked between two copper films, which can realize low-cost production compared to a conventional silver-based etalon filter. The reduced performance due to the inherent oxidation of the copper surface can be overcome by passivating the copper films with monolayer graphene. The anti-oxidation of copper film is investigated by optical microscopy, x-ray photoelectron spectroscopy, and transmission measurement in UV-vi spectral ranges. Our results show that the graphene coating can be expanded for various metal-based optical devices in terms of anti-corrosion.
ISSN:0957-4484
1361-6528
DOI:10.1088/1361-6528/aba3dc