Surface nanostructuring of LiNbO3 by high-density electronic excitations

Lithium niobate (LiNbO3) single crystals were irradiated with high energy gold ions (0.5–2.2GeV) at the UNILAC (GSI) and with 150-keV highly charged xenon ions from an EBIT (Electron Beam Ion Trap, HZDR). The surfaces of the irradiated crystals were analyzed by scanning force microscopy showing very...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2013-11, Vol.315, p.265-268
Main Authors: El-Said, A.S., Wilhelm, R.A., Facsko, S., Trautmann, C.
Format: Article
Language:English
Subjects:
Charged ions
Electronics
Energy loss
Excitation
Heavy ions
High density
Highly charged ions
Ion-surface interaction
Irradiation
Lithium niobates
Nanostructure
Swift heavy ions
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Summary:Lithium niobate (LiNbO3) single crystals were irradiated with high energy gold ions (0.5–2.2GeV) at the UNILAC (GSI) and with 150-keV highly charged xenon ions from an EBIT (Electron Beam Ion Trap, HZDR). The surfaces of the irradiated crystals were analyzed by scanning force microscopy showing very similar topographic changes. Swift heavy ions and slow highly charged ions produce hillock-like nanostructures on the surface. In both cases, the energy deposition of the ions is characterized by dense localized electronic excitations and efficient transfer to the lattice. Furthermore, the irradiation results in a shift in the band gap energy as evidenced by UV–Vis absorption spectroscopy. Specific modifications (e.g. hillock size, energy loss threshold) induced by slow highly charged ions are discussed in comparison with effects due to the electronic energy loss by swift heavy ions.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2013.03.008