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Counter-intuitive strength of electric field induced second harmonic (EFISH) signals at the rear side of thin silicon membranes

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Abstract

Electric field induced second harmonic (EFISH) generation typically increases with laser intensity. Therefore, EFISH signals generated at the rear ${\rm Si}/{{\rm SiO}_2}$ interface by a laser beam transmitted through a thin silicon membrane should be much weaker than the signals generated in reflection at the front surface. The counter-intuitive finding that the signal generated at the rear surface is stronger than the front surface signal [Appl. Phys. B 104, 735 (2011) [CrossRef]  ] is now confirmed by detailed experiments applying 10 to 30 µm thin membranes. Using, in addition, the local laser beam intensity [Appl. Phys. B 123, 253 (2017) [CrossRef]  ] leads to the hypothesis that the quasi-static electric field at the rear interface consists of two counteracting components.

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