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Open AccessFeature PaperArticle

2D Optical Gratings Based on Hexagonal Voids on Transparent Elastomeric Substrate

1
DICAM-University of Trento, Via Mesiano 77, 38123 Trento, Italy
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IFN-CNR CSMFO Lab & FBK CMM, Via alla Cascata 56/C, 38123 Trento, Italy
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CMM-MNF, Fondazione Bruno Kessler, Via Sommarive 18, 38123 Trento (Povo), Italy
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Institute of Low Temperature and Structure Research PAS, 50-422 Wroclaw, Poland
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ORC, University of Southampton, University Road, Southampton SO17 1BJ, UK
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CMM-ARES, Fondazione Bruno Kessler, Via Sommarive 18, 38123 Trento (Povo), Italy
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Enrico Fermi Centre, Piazza del Viminale 1, 00184 Roma, Italy
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Department of Civil and Environmental Engineering, University of Strathclyde, Montrose Street, 75, Glasgow G1 1XJ, UK
*
Author to whom correspondence should be addressed.
Micromachines 2018, 9(7), 345; https://doi.org/10.3390/mi9070345
Received: 29 June 2018 / Revised: 6 July 2018 / Accepted: 9 July 2018 / Published: 10 July 2018
(This article belongs to the Special Issue Glassy Materials Based Microdevices)
A chromatic vectorial strain sensor constituted by hexagonal voids on transparent elastomeric substrate has been successfully fabricated via soft colloidal lithography. Initially a highly ordered 1.6 microns polystyrene spheres monolayer colloidal crystal has been realized by wedge-shaped cell method and used as a suitable mold to replicate the periodic structure on a polydimethylsiloxane sheet. The replicated 2D array is characterized by high periodicity and regularity over a large area, as evidenced by morphological and optical properties obtained by means of SEM, absorption and reflectance spectroscopy. In particular, the optical features of the nanostructured elastomer have been investigated in respect to uniaxial deformation up to 10% of its initial length, demonstrating a linear, tunable and reversible response, with a sensitivity of 4.5 ± 0.1 nm/%. Finally, it has been demonstrated that the specific geometrical configuration allows determining simultaneously the vectorial strain-stress information in the x and y directions. View Full-Text
Keywords: micro/nano patterning; 2D colloidal crystal; soft colloidal lithography; strain microsensor; vectorial strain gauge micro/nano patterning; 2D colloidal crystal; soft colloidal lithography; strain microsensor; vectorial strain gauge
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MDPI and ACS Style

Piccolo, V.; Chiappini, A.; Armellini, C.; Barozzi, M.; Lukowiak, A.; Sazio, P.-J.A.; Vaccari, A.; Ferrari, M.; Zonta, D. 2D Optical Gratings Based on Hexagonal Voids on Transparent Elastomeric Substrate. Micromachines 2018, 9, 345.

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