Ma Heli, Song Kun, Zhou Liang, Zhao Xiaopeng
Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129, China.
Sensors (Basel). 2015 Mar 26;15(4):7454-61. doi: 10.3390/s150407454.
We report a naked eye refractive index sensor with a visible metamaterial absorber. The visible metamaterial absorber consisting of a silver dendritic/dielectric/metal structure shows multiple absorption peaks. By incorporating a gain material (rhodamine B) into the dielectric layer, the maximal magnitude of the absorption peak can be improved by about 30%. As the metamaterial absorber is sensitive to the refractive index of glucose solutions, it can function as a sensor that quickly responds to variations of the refractive index of the liquid. Meanwhile, since the response is presented via color changes, it can be clearly observed by the naked eyes. Further experiments have confirmed that the sensor can be used repeatedly.
我们报道了一种带有可见光超材料吸收体的裸眼折射率传感器。由银树枝状/电介质/金属结构组成的可见光超材料吸收体呈现出多个吸收峰。通过将增益材料（罗丹明B）掺入电介质层中，吸收峰的最大幅度可提高约30%。由于超材料吸收体对葡萄糖溶液的折射率敏感，它可以作为一种对液体折射率变化快速响应的传感器。同时，由于响应通过颜色变化呈现，肉眼可以清晰观察到。进一步的实验证实该传感器可以重复使用。
