Analysis of strained surface layers of ZnO single crystals after irradiation with intense femtosecond laser pulses

Journal Article · Mon May 27 00:00:00 EDT 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4807923· OSTI ID:22162958

Schneider, Andreas; Sebald, Kathrin; Voss, Tobias ^[1]; Wolverson, Daniel ^[2]; Hodges, Chris; Kuball, Martin ^[3]

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1. Semiconductor Optics, Institute of Solid State Physics, University of Bremen, D-28359 Bremen (Germany)
2. Nanoscience Group, Department of Physics, University of Bath, BA2 7AY Bath (United Kingdom)
3. Center for Device Thermography and Reliability (CDTR), H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL (United Kingdom)

Structural modifications of ZnO single crystals that were created by the irradiation with femtosecond laser pulses at fluences far above the ablation threshold were investigated with micro-Raman spectroscopy. After light-matter interaction on the femtosecond time scale, rapid cooling and the pronounced thermal expansion anisotropy of ZnO are likely to cause residual strains of up to 1.8% and also result in the formation of surface cracks. This process relaxes the strain only partially and a strained surface layer remains. Our findings demonstrate the significant role of thermoelastic effects for the irradiation of solids with intense femtosecond laser pulses.

• OSTI ID: 22162958
• Journal Information: Applied Physics Letters, Vol. 102, Issue 21; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
CRYSTAL STRUCTURE
INTERACTIONS
IRRADIATION
LASER RADIATION
LAYERS
MONOCRYSTALS
PULSES
RAMAN SPECTRA
RAMAN SPECTROSCOPY
RESIDUAL STRESSES
SEMICONDUCTOR MATERIALS
SOLIDS
STRAINS
SURFACES
THERMAL EXPANSION
THERMOELASTICITY
ZINC OXIDES