材料科学
光电子学
等离子体子
波长
超材料
吸收(声学)
蓝移
可见光谱
锐钛矿
光学
法布里-珀罗干涉仪
动态范围
带隙
化学
光致发光
光催化
物理
复合材料
催化作用
生物化学
作者
Janna Eaves-Rathert,Elena Kovalik,Chibuzor Fabian Ugwu,Bridget R. Rogers,Cary L. Pint,Jason Valentine
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-02-09
卷期号:22 (4): 1626-1632
被引量:20
标识
DOI:10.1021/acs.nanolett.1c04613
摘要
Dynamic tuning of metamaterials is a critical step toward advanced functionality and improved bandwidth. In the visible spectrum, full spectral color tuning is inhibited by the large absorption that accompanies index changes, particularly at blue wavelengths. Here, we show that the electrochemical lithiation of anatase TiO2 to Li0.5TiO2 (LTO) results in an index change of 0.65 at 649 nm with absorption coefficient less than 0.1 at blue wavelengths, making this material well-suited for dynamic visible color tuning. Dynamic tunability of TiO2 is leveraged in a Fabry-Perot cavity and a gap plasmon metasurface. In the Fabry-Perot configuration, the device exhibits a shift in reflectance of over 100 nm when subjected to only 2 V bias while the gap plasmon metasurface achieves enhanced switching speed. The dynamic range, speed, and cyclability indicate that the TiO2/LTO system is competitive with established actuators like WO3, with the additional advantage of reduced absorption at high frequencies.
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