Abstract
We discuss the separation problem of bulk vs interface contributions in optical Second-Harmonic Generation (SHG). A new method is presented, which — in special cases — provides a full separation of all interface and bulk tensor components. The method is based on measurements in a thin-film geometry, and the relation between two bulk tensor components obtained from group-theoretical arguments. The separation problem in its strict sense is shown to be absent in Magnetization-induced SHG (MSHG). Though, in practice, also in the MSHG case interface and bulk contributions can be closely resemblant. The approach is illustrated by second-harmonic experiments on C60 thin films. SHG in this system is found to be completely dominated by bulk processes.
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Koopmans, B., Janner, A.M., Wierenga, H.A. et al. Separation of interface and bulk contributions in second-harmonic generation from magnetic and non-magnetic multilayers. Appl. Phys. A 60, 103–111 (1995). https://doi.org/10.1007/BF01538233
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DOI: https://doi.org/10.1007/BF01538233