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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 25 — Dec. 8, 2008
  • pp: 20610–20616

Ordered YBCO sub-micron array structures induced by pulsed femtosecond laser irradiation

C.W. Luo, C. C. Lee, C. H. Li, H. C. Shih, Y.-J. Chen, C. C. Hsieh, C. H. Su, W. Y. Tzeng, K. H. Wu, J. Y. Juang, T. M. Uen, S. P. Chen, J.-Y. Lin, and T. Kobayashi  »View Author Affiliations


Optics Express, Vol. 16, Issue 25, pp. 20610-20616 (2008)
http://dx.doi.org/10.1364/OE.16.020610


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Abstract

We report on the formation of organized sub-micron YBa2Cu3O7 (YBCO) dots induced by irradiating femtosecond laser pulses on YBCO films prepared by pulse laser deposition with fluence in the range of 0.21~0.53 J/cm2. The morphology of the YBCO film surface depends strongly on the laser fluences irradiated. At lower laser fluence (~0.21 J/cm2) the morphology was pattern of periodic ripples with sub-micrometer spacing. Slightly increasing the laser fluence to 0.26 J/cm2 changes the pattern into organized sub-micron dots with diameters ranging from 100 nm to 800 nm and height of 150 nm. Further increase of the laser fluence to over 0.32 J/cm2, however, appeared to result in massive melting and led to irregular morphology. The mechanism and the implications of the current findings will be discussed. Arrays of YBCO sub-micron dots with Tc =89.7 K were obtained.

© 2008 Optical Society of America

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(160.0160) Materials : Materials
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Laser Micromachining

History
Original Manuscript: October 20, 2008
Revised Manuscript: November 19, 2008
Manuscript Accepted: November 25, 2008
Published: November 26, 2008

Citation
C. W. Luo, C. C. Lee, C. H. Li, H. C. Shih, Y.-J. Chen, C. C. Hsieh, C. H. Su, W. Y. Tzeng, K. H. Wu, J. Y. Juang, T. M. Uen, S. P. Chen, J.-Y. Lin, and T. Kobayashi, "Ordered YBCO sub-micron array structures induced by pulsed femtosecond laser irradiation," Opt. Express 16, 20610-20616 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-25-20610


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