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Keywords:

  • hierarchical structure;
  • tilted micropillars;
  • wrinkling;
  • tunable transmission;
  • smart window
Thumbnail image of graphical abstract

We demonstrate the design and fabrication of tilted micropillar arrays on wrinkled elastomeric poly(dimethylsiloxane) as a reversibly switchable optical window. Upon re-stretching the as-prepared (opaque) film to the original pre-strain, the grating color is restored and ∼30% transmittance is recovered. Further stretching beyond the pre-strain makes the film more transparent. This process is fully reversible and repeatable for many cycles.