Three-dimensional microneedle arrays were produced
USS4 is a UV sensitive hybrid material that exhibits a refractive
index at 589 nm of 1.520.The Irgacures 369 initiator has an absorption peak at around 320 nm. Femtosecond laser pulses (60 fs, 94MHz, o450mW, 780 nm) from a titanium: sapphire laser (Kapteyn-Murnane, Boulder,CO) were focused using a 10 conventional plan achromat microscope objective into a small focal volume within the photosensitive resin (Fig. 1).The laser pulses passed through the out-of-focus region and didnot interact with the material. On the other hand