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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 27, Iss. 3 — Mar. 1, 2010
  • pp: 531–535

Femtosecond UV laser non-ablative surface structuring of ZnO crystal: impact on exciton photoluminescence

Luc Museur, Jean-Pierre Michel, Patrick Portes, Apostolis Englezis, Andreas Stassinopoulos, Demetrios Anglos, and Andrei V. Kanaev  »View Author Affiliations


JOSA B, Vol. 27, Issue 3, pp. 531-535 (2010)
http://dx.doi.org/10.1364/JOSAB.27.000531


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Abstract

The ultraviolet (UV) laser irradiation (248 nm) of monocrystalline wurtzite ZnO with 450 fs pulses results in surface modification. A formation of two orthogonal ripple structures with a period of 400–500 nm was observed oriented parallel and perpendicular to the laser beam polarization. The UV exciton emission obtained on the irradiated domains is found greatly enhanced locally up to 10 3 times. The photoluminescence band is redshifted by 2–3 nm and 40% narrower (full width at half-maximum), while at the same time the E 2 ( 439 cm 1 ) Raman band intensity increases up to 50 times. The process is found irreversible with the threshold fluence of 11   mJ / cm 2 , which is considerably lower than the ablation threshold 115   mJ / cm 2 . Fine surface nanostructuring on the scale of 10   nm may be responsible for the observed effect. © 2008 Optical Society of America

© 2010 Optical Society of America

OCIS Codes
(240.6700) Optics at surfaces : Surfaces
(260.3800) Physical optics : Luminescence
(350.3390) Other areas of optics : Laser materials processing

ToC Category:
Optics at Surfaces

History
Original Manuscript: June 3, 2009
Revised Manuscript: November 16, 2009
Manuscript Accepted: November 16, 2009
Published: February 22, 2010

Citation
Luc Museur, Jean-Pierre Michel, Patrick Portes, Apostolis Englezis, Andreas Stassinopoulos, Demetrios Anglos, and Andrei V. Kanaev, "Femtosecond UV laser non-ablative surface structuring of ZnO crystal: impact on exciton photoluminescence," J. Opt. Soc. Am. B 27, 531-535 (2010)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-27-3-531

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