Tunable structural color with gradient and multiaxial polydimethylsiloxane wrinkling
File(s)
OA Location
Author(s)
Tan, Annabelle
Pellegrino, Luca
Ahmad, Zain
Cabral, João T
Type
Journal Article
Abstract
The generation of structural color from wrinkled polydimethylsiloxane (PDMS) surfaces, fabricated by plasma exposure, subjected to uni- and multi-axial, and sequential strain fields is examined. The approach is based on the well-known, mechanically-induced, buckling instability of a supported bilayer, whereby the top glassy “skin” is formed by plasma oxidation. Surface periodicities 200 nm ≲ d ≲ 3 μm, encompassing the visible spectrum, are investigated in terms of the observed color, intensity spectrum, and color mixing from different diffraction orders, exhibiting good agreement with model predictions. By contrast with complex fabrication methods, color tunability and mechanochromic response are readily achieved by adjusting plasma and strain parameters, and by dynamically varying strain (ε ≲ 50%). Prescribed strain directionality, employing uniaxial, isotropic, gradient strain, and wave-sum wrinkling superposition, as well as skin thickness (and thus d) and amplitude gradients, using facile and scalable fabrication approaches, yield striking spatial color variation, homogeneity, and directionality.
Date Issued
2022-09-05
Date Acceptance
2022-06-01
Citation
Advanced Optical Materials, 2022, 10 (17)
ISSN
2195-1071
Publisher
Wiley
Journal / Book Title
Advanced Optical Materials
Volume
10
Issue
17
Copyright Statement
© 2022 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Identifier
https://onlinelibrary.wiley.com/doi/10.1002/adom.202200964
Subjects
Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Optics
Materials Science
mechanochromic
polydimethylsiloxane
plasma-oxidation
structural color
tunable
wrinkling superposition
diffraction grating
PLASMA OXIDATION
THIN-FILMS
PATTERNS
INTERFERENCE
DIFFRACTION
0205 Optical Physics
0906 Electrical and Electronic Engineering
0912 Materials Engineering
Publication Status
Published
Article Number
ARTN 2200964
Date Publish Online
2022-06-16