A recent study by the University of Stuttgart research team showed that 3D printing can produce microscopic optical components with higher precision and reproducibility. This discovery may have a major impact on the manufacture of micro-optical components and is expected to create more microscopic devices for use in sensors and communication devices. It is understood that the technology they developed is called femtosecond laser writing. Researchers say they use this technology to directly manufacture a fiber center with a diameter of only 125 microns (equivalent to human hair diameter). A small optical component with only 4.4 microns.
This technology is not much different from other 3D laser engraving techniques, but the printing level has reached the nano level, which is more stable and reliable. Essentially, this process is mainly to selectively harden the photosensitive resin material by pulsed laser, and then remove the unhardened portion to obtain a 3D model of the microscopic optical component. To this end, the R&D team selected a commercial 3D dual laser etching system produced by Nanoscribe.
According to "3D Printing World", the team is still studying how to make multiple types of phase masks, one of which can achieve light refraction inside the fiber. The phase mask can also be used for illumination of very small endoscopes, producing circular light and placing it in a liquid that acts as a light trap to capture particles or cells.
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