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Highspeed manufacturing of periodical surface and in-volume nanostructures by fs-laser direct writing
Author(s): J. Gottmann; D. Wortmann; N. Brandt
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Paper Abstract

Sub wavelength ripples (spacing < λ/4) perpendicular to the polarisation of the laser radiation are obtained by scanning a tightly focused beam (~1μm) of femtosecond laser radiation from a Ti:Sapphire laser (τ=100fs, λ=800nm & 400nm, f=1kHz) and from a Yb:glass fiber laser (τ=400fs, λ=1045nm, f=0.1-5MHz) over the surface of various materials like amorphous Nd:Gd3Ga5O12 films 1 μm in thickness on YAG substrates, diamond, polytetrafluoroethylene, LiF, MgF2, ZBLAN, Al2O3, LiNbO3, SiO2, Si, Cu and Au. The ripple patterns extend coherently over many overlapping laser pulses and scanning tracks. Investigated are the dependence of the ripple spacing Λ on the material, the lateral distance of the laser pulses, the N.A. of the focussing optics, the repetition rate and the applied wavelength. The ripples are characterised using electron microscopy. Some possible models for the origin of the ripple growth are discussed. New results concerning the scaling of the production process using a high repetition rate laser and a fast translation stage are demonstrated. The cross-sections of the ripples are investigated using electron microscopy. A very large aspect ration of ~10 is observed for the periodical nanostructures in fused silica. Using in-volume selective laser etching (ISLE) of sapphire results in deep hollow nanoplanes ~200 nm in width and up to 1 mm in length. Microchannels have been produced using in-volume selective laser etching with a scanning speed of 1 mm/s.

Paper Details

Date Published: 20 February 2008
PDF: 10 pages
Proc. SPIE 6879, Photon Processing in Microelectronics and Photonics VII, 68790N (20 February 2008); doi: 10.1117/12.758353
Show Author Affiliations
J. Gottmann, RWTH Aachen (Germany)
D. Wortmann, RWTH Aachen (Germany)
N. Brandt, RWTH Aachen (Germany)

Published in SPIE Proceedings Vol. 6879:
Photon Processing in Microelectronics and Photonics VII
David B. Geohegan; Andrew S. Holmes; Michel Meunier; Frank Träger; Craig B. Arnold; Jan J. Dubowski; Hiroyuki Niino, Editor(s)

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