Free-form fabricaton using multi-photon excitation


Ontology type: sgo:Patent     


Patent Info

DATE

2001-11-13T00:00

AUTHORS

Steven L. Goodman , Paul Campagnola

ABSTRACT

A method wherein small, two- or three- dimensional structures are formed by multiple-photon-absorbed photopolymerization and/or cross-linking of a precursor composition. Use of multi-photon excitation allows fabrication of structures and structural features having at least one dimension of less than about one micron, preferably less than about 500 nm, more preferably less than about 250 nm, and most preferably of less than about 100 nm, in bulk phase as well as in solution, and from a wide variety of organic and inorganic precursor subunits, including synthetic polymers and biological polymers such as proteins, lipids, oligonucleotides, and the like. In one embodiment, use of two-photon far field optics allows the formation of structures having X-Y dimensions of less than about 300 mn and a Z dimension of less than about 500 nm, while use of three-photon far field optics allows the formation of structures having X-Y dimensions of less than about 250 mn and a Z dimension of less than about 300 nm. In a particularly preferred embodiment, use of a 4 pi optical configuration in combination with two-photon far field excitation allows the formation of structures having X-Y dimensions of less than about 150 nm and a Z dimension of less than about 100 mn. In another embodiment, use of multi-photon near field optics results in the formation of structures having X, Y, and Z dimensions of less than about 50 nm. In this embodiment, near field fabrication is achieved by two-photon excitation through fiber probes. More... »

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