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Updated: Jun 27, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
To realize a variety of structural color adjustments via lossy-dielectric-based Fabry-Perot cavity structure
Md Abdur Rahman1, Dong Kyu Kim1, Jong-Kwon Lee2
1Extreme Materials Research Center, Korea Institute of Science & Technology, 5, Hwarang-Ro 14-Gil, Seongbuk-Gu, Seoul 02792, Republic of Korea.
Abstract:
Structural colors with tunable properties have extensive applications in surface decoration, arts, absorbers, and optical filters. Planar structures have more advantages over other forms studied to date due to their easy manufacturability. Metal-insulator-metal-based structures are one of the known methods to fabricate structural colors where colors can be tuned mainly by the thickness of the intermediate lossless insulator layer. However, generating colors by MIM structure requires a thin metallic layer on top, and the top metals' abrasiveness and/or oxidation may degrade the colors quickly. Thus, we propose a lossy dielectric layer to replace the top metallic layer as a solution to ensure the structure's durability by preventing scratches and oxidation. Herein, CrON/Si3N4/Metal structures have been studied where theoretical investigations suggest that highly saturated colors can be generated in the lossy-lossless dielectric structures. Experimental data validated such simulations by revealing a range of vivid colors. Furthermore, these structures can easily achieve strong light absorption (SLA) even for a thick top layer of ∼100 nm. The colors realized by these structures are appeared due to a combination of the interference effect of the asymmetric Fabry-Perot cavity structure and the absorption rate in the CrO N1- layer.
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