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Wavelength-tunable near-infrared sensor with colorimetric readout

Abstract:

In this work, we propose a novel plasmonic infrared sensor with a colorimetric readout. We present the fabrication of a smart IR sensing material based in the combination of a plasmonic selective IR layer and a 2D nanostructured photonic layer. With this configuration, the infrared radiation is absorbed and efficiently transformed into heat by the wavelength-tunable plasmonic layer, whereas the grating nanostructures on the other side diffracts an external white light into different colors. With this approach we have fabricated arrays of microcantilevers with a densely packed monolayer of gold nanoshells as plasmonic layer. The localized heating of one side induces mechanical deformations on it, altering the periodic grating and the microcantilever curvature, which produce a shifting of the material reflected color.