Multiphoton Direct Laser Writing and 3D Imaging of Polymeric Freestanding Architectures for Cell Colonization.

Laser-assisted direct ink writing of planar and 3D metal architectures.

The ability to pattern planar and freestanding 3D metallic architectures at the microscale would enable myriad applications, including flexible electronics, displays, sensors, and electrically small antennas. A 3D printing method is introduced that combines direct ink writing with a focused laser that locally anneals printed metallic features "on-the-fly." To optimize the nozzle-to-laser separa...

Diffusion-assisted high-resolution direct femtosecond laser writing.

We present a new method for increasing the resolution of direct femtosecond laser writing by multiphoton polymerization, based on quencher diffusion. This method relies on the combination of a mobile quenching molecule with a slow laser scanning speed, allowing the diffusion of the quencher in the scanned area and the depletion of the multiphoton-generated radicals. The material we use is an or...

Direct Laser Writing of Photoresponsive Colloids for Microscale Patterning of 3D Porous Structures

Several routes have recently been introduced for microscale patterning of materials in three dimensions, including multilayer photolithography, nanotransfer printing, LiGA, a german acronym for Lithographie–Galvanoformung–Abformung (lithography-electroplating-molding), microstereolithography, and multiphoton polymerization. Each of these routes typically yields a solid structure, yet novel poro...

Micropatterning of cell attachment on pSi films by direct laser writing

On-chip three-dimensional high-Q microcavities fabricated by femtosecond laser direct writing.

We report on the fabrication of three-dimensional (3D) high-Q whispering gallery microcavities on a fused silica chip by femtosecond laser microfabriction, enabled by the 3D nature of femtosecond laser direct writing. The processing mainly consists of formation of freestanding microdisks by femtosecond laser direct writing and subsequent wet chemical etching. CO(2) laser annealing is followed t...