Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 90: Poster Session: Quantum information systems; Optical properties; Ultrafast phenomena

HL 90.16: Poster

Thursday, March 14, 2013, 16:00–20:00, Poster A

Nonlinear Phononics — •Matthias Gohlke, André Bojahr, and Matias Bargheer — Department of Physics and Astronomy, Potsdam University, Germany

This contribution discusses simulations of nonlinear phononics in SrTiO3 (STO) crystals using realistic parameters. These parameters were derived from ultrafast Brillouin scattering experiments, where a thin metallic film was excited by femtosecond laser pulses to generate large-amplitude hypersound waves[1]. Using the anharmonic linear chain model tested in this publication, we investigate realistic scenarios for nonlinear phononics in full analogy to photonics: We demonstrate second harmonic generation (SHG) as well as difference and sum frequency mixing (DFG and SFG) of quasi-monochromatic phonons synthesized by optical multipulse excitation. We discuss potential applications of such nonlinear techniques, e.g. for the fundamental analysis of phonon-phonon interaction.

[1] A. Bojahr et al., Calibrated real time detection of nonlinearly propagating strain waves, Phys. Rev. B 86,144306 (2012)