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two-photon polymerization

An additive fabrication technique, referred to as TPP, used to make 3D microstructures with submicron feature sizes by using a near-infrared (NIR) emission that excites a photosensitive resin, triggering multiphoton absorption where light intensity is highest and a polymerization process that changes it from a liquid to a solid. When the volume of the focused laser beams, or voxels, are precisely overlapped, 3D microstructures are created and revealed by washing away unsolidified resin with an organic solvent.
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