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Sensors 2015, 15(4), 7454-7461;

A Naked Eye Refractive Index Sensor with a Visible Multiple Peak Metamaterial Absorber

Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129, China
Author to whom correspondence should be addressed.
Academic Editor: Omar M. Ramahi
Received: 18 November 2014 / Revised: 11 March 2015 / Accepted: 19 March 2015 / Published: 26 March 2015
(This article belongs to the Special Issue Metamaterial-Inspired Sensors)
Full-Text   |   PDF [2929 KB, uploaded 26 March 2015]   |  


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. View Full-Text
Keywords: refractive index sensor; naked eyes; metamaterial absorber; bottom-up refractive index sensor; naked eyes; metamaterial absorber; bottom-up

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ma, H.; Song, K.; Zhou, L.; Zhao, X. A Naked Eye Refractive Index Sensor with a Visible Multiple Peak Metamaterial Absorber. Sensors 2015, 15, 7454-7461.

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