School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.
Department of Electrical Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro, Nam-gu, Pohang 37673, Republic of Korea.
Nanoscale. 2017 Mar 2;9(9):2986-2991. doi: 10.1039/c6nr08475c.
We demonstrate ultra-thin, fine-tunable optical coatings with enhanced color purity based on highly absorbent porous media on a metal substrate. We show that the color range provided by these ultra-thin film coatings can be extended by making the absorptive dielectric layer porous. Oblique angle deposition (OAD) of a thin (10-25 nm) germanium (Ge) film by e-beam evaporation onto a thick gold substrate yields controlled porosity. Reflectance spectra and color representations from both calculations and experiments verify the enhancement of resonance tunability and color purity in the nano-tailored coatings. Angle independent reflection properties, and the applicability of such porous Ge on various metal substrates, indicate the strength of these concepts.
我们展示了基于金属基底上高吸收多孔介质的超薄、可调谐光学涂层，具有增强的颜色纯度。我们表明，通过使吸收介电层多孔化，可以扩展这些薄膜涂层提供的颜色范围。通过电子束蒸发在厚金基底上沉积超薄（10-25nm）的锗（Ge）薄膜进行斜角沉积（OAD），可以得到可控的多孔性。反射率谱和计算和实验的颜色表示验证了纳米定制涂层中共振调谐和颜色纯度的增强。角度无关的反射特性以及这种多孔 Ge 在各种金属基底上的适用性表明了这些概念的优势。
