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 103 times. The photoluminescence band is redshifted by 2–3 nm and 40% narrower (full width at half-maximum), while at the same time the E2 (439cm1) Raman band intensity increases up to 50 times. The process is found irreversible with the threshold fluence of 11  mJ/cm2, which is considerably lower than the ablation threshold 115  mJ/cm2. 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

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