Three-dimensional folding of pre-strained polymer sheets via absorption of laser light

  title={Three-dimensional folding of pre-strained polymer sheets via absorption of laser light},
  author={Ying Liu and Matthew N. Miskiewicz and Michael J. Escuti and Jan Genzer and Michael David Dickey},
  journal={Journal of Applied Physics},
Patterned light from a laser can induce rapid self-folding of pre-strained polymer sheets. Black ink coated on the sheet absorbs the light, which converts the photon energy into thermal energy that heats the sheet locally; the temperature of the sheet is highest at the surface where the light impinges on the sheet and decreases through the sheet thickness. The gradient of temperature induces a gradient of strain relaxation through the depth of the sheet, which causes folding within seconds of… Expand

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