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. 2018 Jan 15;18(1):232. doi: 10.3390/s18010232

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Flexible metasurface absorber is proposed as an ethanol sensor. SRCR is inkjet-printed on Kodak premium photo paper, serving as middle layer. Microfluidic channel is engraved on top layer (1 mm thick PDMS), and bottom PDMS layer is added to increase the absorbance. (a) Three-dimensional view of unit cell design; (b) electric field magnitude distribution of unit cell without loading a microfluidic channel; (c) simulation setup for boundary conditions and excitations; and (d) fabricated prototype filled with DI-water. Red ink is mixed with DI-water to make the fluidic path observable (redrawn from [48]).