Experimental and theoretical study of second and third harmonic generation in amorphous silicon

L. Rodríguez-Suné; M. Scalora; C. Cojocaru; N. Akozbek; R. Vilaseca; J. Trull

doi:10.1117/12.2621542

25 May 2022 Experimental and theoretical study of second and third harmonic generation in amorphous silicon

L. Rodríguez-Suné, M. Scalora, C. Cojocaru, N. Akozbek, R. Vilaseca, J. Trull

Proceedings Volume 12143, Nonlinear Optics and its Applications 2022; 1214307 (2022) https://doi.org/10.1117/12.2621542
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

We report contrasted experimental and theoretical results on second and third harmonic generation from an amorphous silicon nanolayer. We perform this study by analysing the harmonic optical signals generated when fs and ps pulses tuned at 800nm and 1064nm, respectively, interact with the material. We measure second and third harmonic efficiencies as functions of angle of incidence and compare with numerical simulations based on a microscopic hydrodynamic model that accounts for different possible contributions to the nonlinear polarization. We measure and estimate the efficiencies of the nonlinear signals using no assumptions about effective surface or volume nonlinearities, enabling proper explanations about the microscopic origins of SH and TH signals arising from the amorphous silicon nanolayer.

Citation Download Citation

L. Rodríguez-Suné, M. Scalora, C. Cojocaru, N. Akozbek, R. Vilaseca, and J. Trull "Experimental and theoretical study of second and third harmonic generation in amorphous silicon", Proc. SPIE 12143, Nonlinear Optics and its Applications 2022, 1214307 (25 May 2022); https://doi.org/10.1117/12.2621542

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