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SKM 2023 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.13: Poster

Montag, 27. März 2023, 13:00–15:00, P2/EG

Electric-field-induced second harmonic generation in amorphous materials for hybrid photonic structures — •Laurids Wardenberg, Benito Bunk, and Jörg Schilling — Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Germany

We investigate electric-field-induced second harmonic generation (EFISH) on different amorphous materials, e.g a-Si and As2S3 films. These materials have sizeable χ(3) values but a vanishing χ(2) due to their amorphous structure. Applying a dc-voltage we gain the ability to create a quasi-χ(2) and perform second order nonlinear optical processes. The possibility to manipulate value and polarity of the created quasi-χ(2) allows an unprecedented control over these second order wavelength conversion processes. Introducing a way to electrically modulate and switch this nonlinearity, is of high practical interest for the realization of nonlinear active hybrid photonic structures.

Since EFISH is strongly associated with the χ(3), we use the z-scan technique to determine the real and the imaginary parts of the χ(3) of the investigated films. Subsequently chromium contacts were deposited on the films and electric fields up to 105 V/m were applied. Our voltage and intensity dependent SHG measurements show a quadratic dependence on input intensity and applied DC field, which is a clear indicator for EFISH. The nonlinear optical measurements are mainly performed at a wavelength of 1030 nm using a femtosecond laser system supplying 200 fs pulses at a repetition rate of 1 kHz. Additional measurements at wavelengths above 1200 nm, which are of interest for silicon photonics, will be demonstrated as well.

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