Compensation of spherical aberration influences for two-photon polymerization patterning of large 3D scaffolds

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• 作者：T. Stichel ; B. Hecht ; R. Houbertz ; G. Sextl
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：121
• 期：1
• 页码：187-191
• 全文大小：1,077 KB
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• 作者单位：T. Stichel (1) (2)
  B. Hecht (2)
  R. Houbertz (1) (4)
  G. Sextl (1) (3)
  
  1. Fraunhofer ISC, Neunerplatz 2, 97082, Würzburg, Germany
  2. Nano-Optics and Biophotonics Group, R?ntgen Research Center for Complex Material Systems, Physikalisches Institut, Lehrstuhl für Experimentelle Physik V, Julius-Maximilians- Universit?t, Am Hubland, 97074, Würzburg, Germany
  4. Multiphoton Optics GmbH, Friedrich-Bergius-Ring 15, 97076, Würzburg, Germany
  3. Lehrstuhl für Chemische Technologie der Materialsynthese, R?ntgenring 11, 97070, Würzburg, Germany
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Optical and Electronic Materials
  Nanotechnology
  Characterization and Evaluation Materials
  Surfaces and Interfaces and Thin Films
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0630

文摘

Two-photon polymerization using femtosecond laser pulses at a wavelength of 515 nm is used for three-dimensional patterning of photosensitive, biocompatible inorganic–organic hybrid polymers (ORMOCER?s). In order to fabricate millimeter-sized biomedical scaffold structures with interconnected pores, medium numerical aperture air objectives with long working distances are applied which allow voxel lengths of several micrometers and thus the solidification of large scaffolds in an adequate time. It is demonstrated that during processing the refraction of the focused laser beam at the air/material interface leads to strong spherical aberration which decreases the peak intensity of the focal point spread function along with shifting and severely extending the focal region in the direction of the beam propagation. These effects clearly decrease the structure integrity, homogeneity and the structure details and therefore are minimized by applying a positioning and laser power adaptation throughout the fabrication process. The results will be discussed with respect to the resulting structural homogeneity and its application as biomedical scaffold.