additive micro- und nano-manufacturing (two-photon polymerization (2PP))
Two-photon polymerization is a laser based additive manufacturing technique, which enables a true three-dimensional fabrication of arbitrary complex models with a resolution down to 100 nm range. The fabrication process based on direct laser writing as a result of the not-linear two-photon absorption in the focus of a highly focused ultra-short pulsed laser beam. By this means, an polymerization reaction is induced limited to the focal volume, which cures a transparent photosensitive material. Nearly arbitrary structures can be fabricated by a computer controlled three-dimensional movement of the laser beam in the material. It is noteworthy that fabrication does not need to be done layer by layer as its known from many other rapid-prototyping techniques.
These properties make 2PP an unique microtechnlogical tool with a wide range of application areas, such as microoptics, micromechanics, microfluidics, microelectronics, medicine and biology.