Defects and strain enhancements of second-harmonic generation in Si/Ge superlattices

Matteo Bertocchi 1 E. Luppi 2 Elena Degoli 3 Valérie Véniard 4, 5 Stefano Ossicini 1, 6
1 Dipartimento di Scienze e Metodi dell'Ingegneria
2 LCT - Laboratoire de chimie théorique
3 Istituto di Nanoscienze
4 LSI - UMR 7642 - Laboratoire des Solides Irradiés
5 ETSF - European Theoretical Spectroscopy Facility
6 Centro Interdipartimentale En&Tech
Abstract : Starting from experimental findings and interface growth problems in Si/Ge superlattices, we have investigated through ab initio methods the concurrent and competitive behavior of strain and defects in the second-harmonic generation process. Interpreting the second-harmonic intensities as a function of the different nature and percentage of defects together with the strain induced at the interface between Si and Ge, we found a way to tune and enhance the second-harmonic generation response of these systems. (C) 2014 AIP Publishing LLC.
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Journal of Chemical Physics, American Institute of Physics, 2014, 140 (21), pp.214705. 〈10.1063/1.4880756〉
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Matteo Bertocchi, E. Luppi, Elena Degoli, Valérie Véniard, Stefano Ossicini. Defects and strain enhancements of second-harmonic generation in Si/Ge superlattices. Journal of Chemical Physics, American Institute of Physics, 2014, 140 (21), pp.214705. 〈10.1063/1.4880756〉. 〈hal-01024364〉

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