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Open AccessArticle

Design of Polarization-Independent and Wide-Angle Broadband Absorbers for Highly Efficient Reflective Structural Color Filters

1
Department of Physics, Inha University, Incheon 22212, Korea
2
Department of Mechanical Engineering, Ajou University, San 5, Woncheon-Dong, Yeongtong-Gu, Suwon 16499, Korea
3
Department of Energy Systems Research, Ajou University, San 5, Woncheon-Dong, Yeongtong-Gu, Suwon 16499, Korea
4
Department of Electrical and Computer Engineering, Ajou University, San 5, Woncheon-Dong, Yeongtong-Gu, Suwon 16499, Korea
5
Department of Chemical Engineering, Inha University, Incheon 22212, Korea
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2019, 12(7), 1050; https://doi.org/10.3390/ma12071050
Received: 8 February 2019 / Revised: 20 March 2019 / Accepted: 25 March 2019 / Published: 30 March 2019
(This article belongs to the Special Issue Advanced/Alternative Transparent Conducting Oxides)
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Abstract

We propose a design of angle-insensitive and polarization-independent reflective color filters with high efficiency (>80%) based on broad resonance in a Fabry–Pérot cavity where asymmetric metal-dielectric-metal planar structures are employed. Broadband absorption properties allow the resonance in the visible range to remain nearly constant over a broad range of incident angles of up to 40° for both s- and p-polarizations. Effects of the angles of incidence and polarization state of incident light on the purity of the resulting colors are examined on the CIE 1931 chromaticity diagram. In addition, higher-order resonances of the proposed color filters and their electric field distributions are investigated for improved color purity. Lastly, the spectral properties of the proposed structures with different metallic layers are studied. The simple strategy described in this work could be adopted in a variety of research areas, such as color decoration devices, microscopy, and colorimetric sensors. View Full-Text
Keywords: absorbers; structural colors; resonators; Fabry–Pérot absorbers; structural colors; resonators; Fabry–Pérot
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Lee, K.-T.; Kang, D.; Park, H.J.; Park, D.H.; Han, S. Design of Polarization-Independent and Wide-Angle Broadband Absorbers for Highly Efficient Reflective Structural Color Filters. Materials 2019, 12, 1050.

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