1.
Opt Express
; 28(8): 12342-12351, 2020 Apr 13.
Artigo
em Inglês
| MEDLINE
| ID: mdl-32403732
RESUMO
We propose a simple autofocusing technique that can be introduced into conventional two-photon lithography systems without additional devices. Autofocusing is achieved by image processing using transmission images of photopolymerized voxels. The signal-to-noise ratio of transmission images was improved by optimal low-pass filtering to detect voxels in them. The focal point was detected with an accuracy of about 250 nm from the difference images. Further, we demonstrated mass-fabrication of a 5 × 5 spiral square array with an area of 900 × 900 µm2 using this method. The method has potential application in constructing low-cost, compact and versatile two-photon lithography apparatus.