He Xiaoping, Li Guozhou, Wu Dong
School of Data and Computer Science, Guangdong Peizheng College, Guangzhou 510830, China.
State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.
Nanoscale. 2021 Nov 11;13(43):18356-18362. doi: 10.1039/d1nr05804e.
Dynamically tunable plasmonic colors hold great promise for a wide range of applications including color displays, colorimetric sensing, and information encryption. However, dynamic control speed of plasmonic colors is still slow to date. Herein, we propose to use a needle to direct the flow of water and gas pressure to drive water, realizing a simultaneous direction-controllable and fast plasmonic color transition. The highly reflected background light of the metallic nanogroove metasurface is suppressed to generate high-purity plasmonic colors through the cross-polarized input and output configuration. When the environment is changed from air to water, a giant color change from cyan to red (a wavelength shift of 156 nm) is experimentally observed. More importantly, by utilizing a needle to steer the flow of water, direction-controllable and fast plasmonic color transition is achieved by controlling gas pressure to drive water. Compared with current state-of-the-art plasmonic color scanning technology, the color transition time water driven by gas pressure decreases by three orders of magnitude for the same scanning length. The multi-degrees of freedom dynamic structural colors could have potential applications in dynamic displays, anti-counterfeiting, and information security.
动态可调谐的等离子体颜色在包括彩色显示、比色传感和信息加密等广泛应用中具有巨大潜力。然而，迄今为止，等离子体颜色的动态控制速度仍然较慢。在此，我们提出使用一根针来引导水流，并利用气压驱动水，实现同时具有方向可控性和快速的等离子体颜色转变。通过交叉极化的输入和输出配置，抑制了金属纳米槽超表面的高反射背景光，从而产生高纯度的等离子体颜色。当环境从空气变为水时，实验观察到从青色到红色的巨大颜色变化（波长偏移156nm）。更重要的是，通过利用针来引导水流，通过控制气压驱动水实现了方向可控且快速的等离子体颜色转变。与当前最先进的等离子体颜色扫描技术相比，在相同扫描长度下，气压驱动水的颜色转变时间减少了三个数量级。这种多自由度动态结构颜色在动态显示、防伪和信息安全方面可能具有潜在应用。
