Journal
ADVANCED OPTICAL MATERIALS
Volume 4, Issue 5, Pages 715-721Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201500601
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Funding
- CCMX-Fanosense
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This study presents a strain sensor based on plasmonic Fano resonances. The investigated system consists of U-shaped aluminum nanowires that are fabricated at wafer scale with hot embossing and oblique metal evaporation. The proposed process is compatible with roll-to-roll manufacturing. The observed Fano resonance is very sensitive to the spacing between the wires and responds to strain with a spectral shift as well as attenuation of the resonance amplitude. This relation between nanoscopic displacement and optical properties is investigated with scanning electron microscopy and numerical simulations. Finally, a clearly visible color change from purple to green is achieved through optimization of the structural parameters, which enables colorimetric or even visual sensing and hence remote read-out for example using a camera.
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