Participation at Photonics West 2017
- News and events
- San Francisco,
Presentation of AIMEN´s research results on direct writing of zero taper high aspect ratio features on elastomer micromoulds with femtosecond laser
Ultrasound transducers for medical imaging demand increasing performance/cost ratio, pushing the limits of current piezoceramic machining manufacturing methods. We are developing a method based on direct laser machining of elastomeric moulds for replication of the transducer microstructure, consisting in a dense arrangement of micropillars. The work studies the benefits of using platinum catalyst loaded elastomers for producing the moulds, and the laser-material interaction in the femtosecond regime. Previous work show high aspect ration (1:5 to 1:7) drilling and machining of transparent PDMS through nonlinear absorption and filamentation. Processing catalyst enhanced siloxane improves the geometrical and surface quality of the machined features, and allow for better than 1:15 aspect ratios. Cylindrical columns of 1000 microns depth and under 60 microns diameter, with zero taper, are shown to be produced with 400 fs laser, 15 microJ pulses at 1 MHz and 515 nm. The mechanism for this improved performance and the prospect for micromould manufacturing are explored.
Download the Photonics West 2017 Advance Program here.