| Popis: |
Diffractive optical elements (DOEs) are important flat optics for light phase modulation and are widely used in sensors, spectrometers, and optical designs. DOEs are fabricated mainly by nanofabrication, such as lithography, in clean rooms. This paper reports a novel 3D printing method to fabricate DOEs in minutes using low-cost 3D printers. The as-printed gratings were cleaned and drop coated to achieve a flat surface. A collimated 520nm laser beam passed through the printed samples successfully generated the designed diffraction patterns. The results validated the functionality of the gratings. The printed DOE did not degrade by UV curing, which indicates the stability of the gratings fabricated by the proposed method. Besides, another kind of DOE, Fresnel axicon, was 3D printed with different printing strategy and reasonable diffraction pattern was observed. |
