Abstract
Frequently observed coherent structures in laser-surface processing are ripples, also denoted as laser-induced periodic surface structures (LIPSS). For polyethylene terephthalate (PET) and polystyrene (PS), LIPSS can be induced by irradiation with linearly polarized ns-pulsed UV laser light. Under an angle of incidence of θ, their lateral period is close to the laser wavelength λ divided by (n eff − sinθ). Here, n eff is the effective refractive index which is 1.32 and 1.23 for PET and PS, respectively. We describe potential applications of LIPSS for alignment and activation of human cells cultivated on polymer substrates, as well as for formation of separated gold nanowires which show pronounced surface plasmon resonances, e.g., at 775 nm for PET.
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Acknowledgments
The support by the Austrian Research Promotion Agency FFG by project 838955 CellStretch (J. H., R.-A. B., B. M., R. M.) and the support by the Grant Agency of the CR under the project 13-06609S (P. S., V.S.) are gratefully acknowledged. We also want to thank H. Piglmayer-Brezina for gold deposition and SEM characterization.
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Barb, RA., Hrelescu, C., Dong, L. et al. Laser-induced periodic surface structures on polymers for formation of gold nanowires and activation of human cells. Appl. Phys. A 117, 295–300 (2014). https://doi.org/10.1007/s00339-013-8219-9
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DOI: https://doi.org/10.1007/s00339-013-8219-9