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NEWS

Participation at Photonics West 2017

Presentation of AIMEN´s research results on direct writing of zero taper high aspect ratio features on elastomer micromoulds with femtosecond laser

On Tuesday 31st of January, whithin the international forum of LASE conference in Photonics West 2017,  Nerea Otero will present AIMEN´s  last 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.